Archive for the ‘Sedbuk’ Category

Listing of current British Gas combi boilers listed in declining SEDBUK rating order.

British Gas: RD : 532i Combi
gas : combi : condensing : wall mounted
Power Rating: (32.5 – 32.5 kW)
SEDBUK efficiency 90.3%

British Gas: RD : 537i Combi
gas : combi : condensing : wall mounted
Power Rating: (37.5 – 37.5 kW)
SEDBUK efficiency 90.3%

British Gas: RD : 532 Combi
gas : combi : condensing : wall mounted
Power Rating: (32.5 – 32.5 kW)
SEDBUK efficiency 90.3%

British Gas: 532 :
gas : combi : condensing : wall mounted
Power Rating: (30 – 30 kW)
SEDBUK efficiency 90.2%

British Gas: 537 :
gas : combi : condensing : wall mounted
Power Rating: (30.0 – 30.0 kW)
SEDBUK efficiency 90.2%

British Gas: 542 :
gas : combi : condensing : wall mounted
Power Rating: (30 – 30 kW)
SEDBUK efficiency 90.2%

British Gas: 537/I :
gas : combi : condensing : wall mounted
Power Rating: (30.0 – 30.0 kW)
SEDBUK efficiency 90.2%

British Gas: 532/I :
gas : combi : condensing : wall mounted
Power Rating: (30.0 – 30.0 kW)
SEDBUK efficiency 90.2%

British Gas: 542/I :
gas : combi : condensing : wall mounted
Power Rating: (30.0 – 30.0 kW)
SEDBUK efficiency 90.2%

British Gas: RD : 542i Combi
gas : combi : condensing : wall mounted
Power Rating: (40.0 – 40.0 kW)
SEDBUK efficiency 90.0%

British Gas: RD628 : RSF
gas : combi : non condensing : wall mounted
Power Rating: (28 – 28 kW)
SEDBUK efficiency 78.4%

British Gas/Scottish Gas: C1 : RSF
gas : combi : non condensing : wall mounted
Power Rating: (28 – 28 kW)
SEDBUK efficiency 78.2%

This information has been collated from Manufacturers literature and the SEDBUK online database as at April 2007.

Small variations in efficiency ratings are not significant. It can be assumed that a 3% difference in rating will give a 95% confidence that the higher rated boiler is more efficient than the lower.

Listing of current regular boilers for British Gas listed in declining SEDBUK rating order.

British Gas: RD : 430i System
gas : regular : condensing : wall mounted
Power Rating: (29.5 – 29.5 kW)
SEDBUK efficiency 90.7%

British Gas: RD : 428 System
gas : regular : condensing : wall mounted
Power Rating: (27.7 – 27.7 kW)
SEDBUK efficiency 90.7%

British Gas: 430/I :
gas : regular : condensing : wall mounted
Power Rating: (30.0 – 30.0 kW)
SEDBUK efficiency 90.3%

British Gas: 430 :
gas : regular : condensing : wall mounted
Power Rating: (30 – 30 kW)
SEDBUK efficiency 90.3%

British / Scottish Gas: RD2 470 :
gas : regular : non condensing : floor mounted
Power Rating: 20.5 kW SEDBUK efficiency 79.9%

British / Scottish Gas: RD2 480 :
gas : regular : non condensing : floor mounted
Power Rating: 23.4 kW SEDBUK efficiency 79.7%

British / Scottish Gas: RD115 Silver :
gas : regular : non condensing : wall mounted
Power Rating: 14.7 kW SEDBUK efficiency 79.6%

British / Scottish Gas: RD115 :
gas : regular : non condensing : wall mounted
Power Rating: 14.7 kW SEDBUK efficiency 79.6%

British / Scottish Gas: RD109 :
gas : regular : non condensing : wall mounted
Power Rating: 8.8 kW SEDBUK efficiency 79.4%

British / Scottish Gas: RD109 Silver :
gas : regular : non condensing : wall mounted
Power Rating: 8.8 kW SEDBUK efficiency 79.4%

British / Scottish Gas: RD2 460 :
gas : regular : non condensing : floor mounted
Power Rating: 17.6 kW SEDBUK efficiency 79.2%

British / Scottish Gas: RD2 450 :
gas : regular : non condensing : floor mounted
Power Rating: 14.7 kW SEDBUK efficiency 79.0%

British / Scottish Gas: RD2 4100 :
gas : regular : non condensing : floor mounted
Power Rating: 29.3 kW SEDBUK efficiency 78.9%

British / Scottish Gas: RD112 Silver :
gas : regular : non condensing : wall mounted
Power Rating: 11.7 kW SEDBUK efficiency 78.6%

British / Scottish Gas: RD112 :
gas : regular : non condensing : wall mounted
Power Rating: 11.7 kW SEDBUK efficiency 78.6%

British / Scottish Gas: RD121 :
gas : regular : non condensing : wall mounted
Power Rating: 20.5 kW SEDBUK efficiency 78.5%

British / Scottish Gas: RD121 Silver :
gas : regular : non condensing : wall mounted
Power Rating: 20.5 kW SEDBUK efficiency 78.5%

British / Scottish Gas: RD2 4125 :
gas : regular : non condensing : floor mounted
Power Rating: 36.6 kW SEDBUK efficiency 78.5%

British / Scottish Gas: RD2 440 :
gas : regular : non condensing : floor mounted
Power Rating: 11.7 kW SEDBUK efficiency 78.3%

British / Scottish Gas: RD118 Silver :
gas : regular : non condensing : wall mounted
Power Rating: 17.6 kW SEDBUK efficiency 78.3%

British / Scottish Gas: RD118 :
gas : regular : non condensing : wall mounted
Power Rating: 17.6 kW SEDBUK efficiency 78.3%

British / Scottish Gas: RD124 :
gas : regular : non condensing : wall mounted
Power Rating: 23.4 kW SEDBUK efficiency 78.1%

British / Scottish Gas: RD124 Silver :
gas : regular : non condensing : wall mounted
Power Rating: 23.4 kW SEDBUK efficiency 78.1%

British / Scottish Gas: RD130 Silver :
gas : regular : non condensing : wall mounted
Power Rating: 29.3 kW SEDBUK efficiency 78.0%

British / Scottish Gas: RD130 :
gas : regular : non condensing : wall mounted
Power Rating: 29.3 kW SEDBUK efficiency 78.0%

This information has been collated from Manufacturers literature and the SEDBUK online database as at April 2007.

Small variations in efficiency ratings are not significant. It can be assumed that a 3% difference in rating will give a 95% confidence that the higher rated boiler is more efficient than the lower.

New Condensing boilers, the facts for your consideration.

A condensing boiler is a finance saving innovative boiler that contains an extra heat exchanger to enable the hot waste gases transfer much of their inherent heat to start to heat the water in the boiler system. Once running at high efficiency, the water vapour produced in the combustion action distils back into water releasing the latent heat of vaporisation.

A result will be this liquid, referred to as condensate, often acidic, required to be piped outside to a drain or water drain. The water will pass down a simple plastic pipe to the outside, there is nothing special about this although you will need to ensure that it is installed in the way that prevents the pipe freezing in winter. If the condensate cannot drain away the condensing boiler sensors will stop the boiler operating and you will think that you have a boiler breakdown. Clearing the problem is relatively simple, although this could appear very complicated if you do not know what the problem is. It is better to ensure that the installation of the condensate drain prevents this problem from ever occurring rather than ensuring that you have access to a boiler breakdown service.

The boiler is required to be mounted on a wall and the waste fumes will travel through the flue. Hot water is supplied by a small-scale receptacle tank to facilitate rapid hot water availability.

What size of boiler should I purchase?

You should bear in mind that when first fitted central heating engineers frequently installed boilers that had a higher output than strictly necessary.. Whilst this meant that there was never the chance of the boiler falling short on its requirements, irregardless of the winter weather, it also meant that they were only using a piece of their heat generation capabilities, and so functioning under their configured optimal efficiency. If you have insulated your household since the present boiler was fitted in your house, you will likely find that you will need a humbler boiler than before.

Make sure you get advice from a CORGI installer before purchasing your next boiler. The lowest price is not necessarily best in terms of boiler installation and your priority should be to achieve a safe boiler installation and one that helps to avoid future heating problems.

Do I need to fit oversize radiators with condensing boilers??

The main driver for smaller fuel consumption from a condensing boiler results from having a larger heat exchanger. Bigger radiators would allow lower return temperatures, and so enable greater energy efficiency, but the extra benefit has not been regarded as cost effective, as you need to remember that that the system is is only using a small part of its overall capacity for the bulk of the heating season. Whilst this affirmation is correct householders would plausibly accept this in smaller properties.

The process we have talked over was contained in the reference document for the SEDBUK project, and assessed whether there needed to be new conditions for condensing boilers. The decision was that no new recommendations were expected, and the test results forall the boiler types use the same SEDBUK formula.

Condensing boilers are the standard form of boiler that is installed these days. This is a boiler installation stipulation within the latest gas boiler regulations driven by the need to lower the countries carbon footprint. Condensing boilers are very energy efficient and therefore have lower energy requirements the resulting in lower energy bills.

A condensing boiler is a high efficiency innovative boiler that incorporates an extra heat exchanger so that the hot waste air transfer a percentage of their inherent heat to start to heat the cold water input. This reduces the energy requirement to heat this, now warm water, to the required temperature. Once functioning at a good efficiency, the water steam developed in the burning process distils back into liquid form liberating the latent heat of vaporisation.

A consequence results in this water, called condensate, typically acidic, will need to be piped outside to a drain or water drain. The boiler will have to be mounted to a wall and the waste gases will travel through the flue. Hot water is initially served by a little recepticle tank to enable speedy hot water availability.

What size of boiler should I get?

An energy audit carried out by a professional will accurately determine the size of boiler which is best suited to your needs taking into account heat loss profile of your house and the hot water demands of your family. In earlier days boiler installers filled bigger boilers than were needed. Whilst this meant that there was never the chance of the boiler being unable to render sufficient hot water, even in the coldest wintertimes, it also meant that they were mainly working at a part load, and so functioning in an ineffective way. If you have fitted additional loft or cavity wall insulating material since the previous boiler was installed, it is highly likely that you will be recommended to install a smaller boiler than before. Getting the right size of boiler is important as you do not want an overpowered model that is operating inefficiently and burning more gas than you require.

We advocate looking for professional advice from a CORGI recorded fitter before selecting an appropriate replacement boiler.

Do the radiators need to be oversized with a condensing boiler?

The underlying reason for this improved efficiency from a condensing boiler is because it holds a bigger heat exchanger. Larger radiators would result in cooler return water temperatures, and so enable greater energy efficiency, but the further saving is not shown to be cost effective, as you need to remember that that the system is considerably under-loaded for the majority of the heating season. That in all probability remains true, though the smaller heating requirement for new build may well mean that householders would now allow over-sized radiators more willingly.

These consequences were counted during the SEDBUK project, and assessed whether there required to be new conditions for condensing boilers. The result was that no new recommendations were required, and the test results for all the boiler types use the same SEDBUK calculation.

If you have been researching what types of boiler that are available to install within a new central heating system or to replace an existing boiler you will have come across condensing boilers. These are a new design of boiler which have gone through some teething problems in their evolution but are now accepted as the standard type of boiler which is set up and fitted in the nation’s homes. The main design consideration within these has been to eliminate wastage, delivering a very high efficiency heating boiler thereby helping to cut costs and carbon dioxide emissions.

A new and modern condensing boiler is a efficient advanced boiler that integrates an additional heat exchanger which then permits the very hot exhaust gases transfer most of their heat to pre warm the mains water to be heated. When working at maximum efficiency, the water steam developed in the combustion process turns revert back into liquid form relinquishing the heat held within the gas. Providing all is working efficiently the condensing boiler will always be trying to heat tepid water rather than trying to heat up cold water which has just arrived from the water mains.

A consequence is that this water, referred to as the condensate will need to run to a drain or soakaway outside your property. The boiler will have to be firmly fixed to a solid wall and the now cool exhaust fumes will rise through the flue. This flu must be positioned hiking of two not endanger people as they walk past and you also should ensure that the location of the flue ensures that the steam plume which it emits just not interfere with neighbouring properties.

Can you suggest on the right boiler size?

In the past boiler installers often 50 a higher power boiler than the property required. Whilst guaranteeing that the boiler was always able to meet the demand for heat, even in the coldest winters, it also resulted in house owners employing a fraction of their boilers capabilities, and so functioning below their maximum efficiency. If you have installed additional loft or cavity wall insulation since the last boiler was fitted, it could well be that you will need a lower power you need than you currently have.

Before you purchase a new boiler we advocate you get advice from a properly qualified registered boiler fitter. If they conduct a thorough heat loss assessment of your property they should be able to advise you of the right size of boiler that is required.

Should I install oversize radiators with a condensing boiler?

The launch heat exchanger means that the condensing boiler requires less gas to heat your home Larger radiators would result in cooler return water temperatures, and so result in even better energy performance, but the additional economies suffer from diminishing returns, as you should consider that the system is is only utilising a fraction of its overall capacity for the main heating months.

The SEDBUK initiative considered these subjects, and evaluated whether there required to be new considerations for condensing boilers. The conclusion was that they need not, and the final test results for both cases use the same SEDBUK computation.

Are you looking for a condensing boiler review. The following is a review of how a condensing boiler works, it is not possible to review every condensing boiler that is offered in the marketplace. In fact this would be a silly thing to do, not everyone of these boilers will be suitable for your home and you will need expert advice in order to choose the right boiler to deliver excellent performance within your central heating system for the next 10 to 15 years.

A modern condensing gas boiler is actually a high efficiency boiler that crucially includes an additional heat exchanger in order that the red-hot waste gases transfer much of their heat to pre warm the water in the boiler system. When running at a good efficiency, the water steam produced in the gas combustion reverts back into water loosing heat to the heat exchanger.

A consequence is that this liquid, called condensate, most times acidic, needs to be allow to run to an outside drain or soak away. There is a small collection bottle within the condensing boiler but this has limited capacity and once full, if condensate is not going away, it will register a full within the boiler and it could stop operating in order to protect you. The boiler should be fitted against a solid wall and the output fumes will pass through the flue. Hot water is initially served by a small receptacle tank to enable convenient and rapid hot water availability.

Can you advise on the right boiler size?

It was a past practice to install outsize boilers. Whilst this ensured that there was no possibility of the boiler being underpowered and struggling to produce the required levels of hot water, even when experiencing severe winters, it also had the consequence that they were only employing a part of their heat generation capabilities, and so running in an ineffective mode. If you have improved the energy efficiency of your household since the last boiler was fitted, it could well be that you’re boiler installer could suggest the fitting of a smaller boiler than before.

We advocate looking for professional advice from a “gas safe” registered installer before selecting a suitable substitute boiler.

Do I need to set up outsize radiators with condensing boilers??

There is no secret as to why a condensing gas boiler has improved efficiency, the design comprises a bigger heat exchanger. Bigger radiators if fitted could result in a much cooler return water temperatures, and so result in even better energy performance, but the extra economies suffer from falling returns, as you should count the fact that the system is running at very low capacity for a long period of of the heating season. That most likely is still correct, though the reduced hot water and heating requirements experience with a property can apply that homeowners would now allow over-sized radiators more willingly.

The SEDBUK project looked at this, during which it was considered whether condensing boilers required to be treated differently from others. The result of elongated review is now known and there will not be any revisions meaning thatthe test results for all the boiler types share the same efficiency computation.

Listing of current oil fired combi boilers listed in declining SEDBUK rating order.

Grant: Vortex : Outdoor Condensing Combi 36
oil : combi : condensing : floor mounted
Power rating 36 kW
SEDBUK efficiency 94.2%

Grant: Vortex Condensing : Combi 36
oil : combi : condensing : floor mounted
Power rating 36 kW
SEDBUK efficiency 94.2%

Grant: Vortex : Outdoor Condensing Combi 26
oil : combi : condensing : floor mounted
Power rating 26 kW
SEDBUK efficiency 92.2%

Grant: Vortex Condensing : Combi 26
oil : combi : condensing : floor mounted
Power rating 26 kW
SEDBUK efficiency 92.2%

Firebird: Combipac C20 :
oil : combi : condensing : floor mounted
Power rating (15 – 20 kW)
SEDBUK efficiency 90.7%

Firebird: Combi C20 :
oil : combi : condensing : floor mounted
Power rating (15 – 20 kW)
SEDBUK efficiency 90.7%

Firebird: Combipac C26 :
oil : combi : condensing : floor mounted
Power rating (20 – 26 kW)
SEDBUK efficiency 90.6%

Firebird: Combi C26 :
oil : combi : condensing : floor mounted
Power rating (20 – 26 kW)
SEDBUK efficiency 90.6%

Worcester: Greenstar Heatslave External : 25/32
oil : combi : condensing : floor mounted
Power rating (25 – 32 kW)
SEDBUK efficiency 90.3%

Worcester Greenstar: Heatslave : 25/32
oil : combi : condensing : floor mounted
Power rating (25 – 32 kW)
SEDBUK efficiency 90.3%

Firebird: Combipac C35 :
oil : combi : condensing : floor mounted
Power rating (26 – 35 kW)
SEDBUK efficiency 90.3%

Firebird: Combi C35 :
oil : combi : condensing : floor mounted
Power rating (26 – 35 kW)
SEDBUK efficiency 90.3%

Worcester: Greenstar Heatslave External : 12/18
oil : combi : condensing : floor mounted
Power rating (12 – 18 kW)
SEDBUK efficiency 90.2%

Worcester Greenstar: Heatslave : 12/18
oil : combi : condensing : floor mounted
Power rating (12 – 18 kW)
SEDBUK efficiency 90.2%

Grant: Vortex Outdoor : Combi 21
oil : combi : condensing : floor mounted
Power rating 21 kW
SEDBUK efficiency 90.2%

Grant: Vortex Condensing : Combi 21
oil : combi : condensing : floor mounted
Power rating 21 kW
SEDBUK efficiency 90.2%

Mistral: CC 26/40 plus contract :
oil : combi : condensing : floor mounted
Power rating (35 – 40 kW)
SEDBUK efficiency 90.2%

Mistral: CC3 26/35 plus :
oil : combi : condensing : floor mounted
Power rating (26 – 35 kW)
SEDBUK efficiency 90.2%

Mistral: CODC 26/40 plus contract :
oil : combi : condensing : floor mounted
Power rating (26 – 40 kW)
SEDBUK efficiency 90.2%

Mistral: CODC4 35/40 plus :
oil : combi : condensing : floor mounted
Power rating (35 – 40 kW)
SEDBUK efficiency 90.2%

Mistral: CC4 35/40 plus :
oil : combi : condensing : floor mounted
Power rating (35 – 40 kW)
SEDBUK efficiency 90.2%

Mistral: CC4 35/40 Std :
oil : combi : condensing : floor mounted
Power rating (35 – 40 kW)
SEDBUK efficiency 90.2%

Mistral: CODC3 26/35 Std :
oil : combi : condensing : floor mounted
Power rating (26 – 35 kW)
SEDBUK efficiency 90.2%

Mistral: CC3 26/35 Std :
oil : combi : condensing : floor mounted
Power rating (26 – 35 kW)
SEDBUK efficiency 90.2%

Mistral: CODC 26/40 Std Contract :
oil : combi : condensing : floor mounted
Power rating (26.4 – 40 kW)
SEDBUK efficiency 90.2%

Mistral: CC 26/40 Std Contract :
oil : combi : condensing : floor mounted
Power rating (26 – 40 kW)
SEDBUK efficiency 90.2%

Mistral: CODC3 26/35 plus :
oil : combi : condensing : floor mounted
Power rating (35 – 40 kW)
SEDBUK efficiency 90.2%

Mistral: CODC4 35/40 Std :
oil : combi : condensing : floor mounted
Power rating (35 – 40 kW)
SEDBUK efficiency 90.2%

Worcester: Greenstar Heatslave : 18/25-OSO-GB
oil : combi : condensing : floor mounted
Power rating (18 – 25 kW)
SEDBUK efficiency 90.1%

Worcester: Greenstar Heatslave External : 18/25
oil : combi : condensing : floor mounted
Power rating (18 – 25 kW)
SEDBUK efficiency 90.1%

Mistral: CODC 15/26 Plus Contract :
oil : combi : condensing : floor mounted
Power rating (15.0 – 26.4 kW)
SEDBUK efficiency 90.0%

Mistral: CODC2 20/26 Plus :
oil : combi : condensing : floor mounted
Power rating (20.0 – 26.4 kW)
SEDBUK efficiency 90.0%

Mistral: CODC1 15/20 Plus :
oil : combi : condensing : floor mounted
Power rating (15.0 – 20.5 kW)
SEDBUK efficiency 90.0%

Mistral: CC 15/26 Plus Contract :
oil : combi : condensing : floor mounted
Power rating (15 – 26.4 kW)
SEDBUK efficiency 90.0%

Mistral: CC1 15/20 Std :
oil : combi : condensing : floor mounted
Power rating (15 – 20.5 kW)
SEDBUK efficiency 90.0%

Mistral: CODC2 20/26 Std :
oil : combi : condensing : floor mounted
Power rating (20.0 – 26.4 kW)
SEDBUK efficiency 90.0%

Mistral: CODC 15/26 Std Contract :
oil : combi : condensing : floor mounted
Power rating (15.0 – 26.4 kW)
SEDBUK efficiency 90.0%

Mistral: CC2 20/26 Std :
oil : combi : condensing : floor mounted
Power rating (20.5 – 26.4 kW)
SEDBUK efficiency 90.0%

Mistral: CC 15/26 Std Contract :
oil : combi : condensing : floor mounted
Power rating (15 – 26.4 kW)
SEDBUK efficiency 90.0%

Mistral: CC2 20/26 Plus :
oil : combi : condensing : floor mounted
Power rating (20.5 – 26.4 kW)
SEDBUK efficiency 90.0%

Mistral: CC1 15/20 Plus :
oil : combi : condensing : floor mounted
Power rating (15 – 20.5 kW)
SEDBUK efficiency 90.0%

Warmflow: Combi : C90HE
oil : combi : condensing : floor mounted
Power rating (21 – 26 kW)
SEDBUK efficiency 90.0%

Mistral: COD – C – 7090 : Outdoor Combi
oil : combi : condensing : floor mounted
Power rating (20.5 – 26.3 kW)
SEDBUK efficiency 89.7%

Mistral: COD – C – 5070 : Outdoor Combi
oil : combi : condensing : floor mounted
Power rating (14.6 – 20.5 kW)
SEDBUK efficiency 89.7%

45 Mistral: CC1 – 5070 : Condensing Combi
oil : combi : condensing : floor mounted
Power rating (14.6 – 20.5 kW)
SEDBUK efficiency 89.7%

Mistral: CC2 – 7090 : Condensing Combi
oil : combi : condensing : floor mounted
Power rating (20.5 – 26.3 kW)
SEDBUK efficiency 89.7%

Heating World Group: Grandee Combi Condensing External : FS 15/23
oil : combi : condensing : wall mounted
Power rating (15 – 21 kW)
SEDBUK efficiency 89.1%

Heating World Group: Grandee Combi Condensing : FS 15/23
oil : combi : condensing : wall mounted
Power rating (15 – 21 kW)
SEDBUK efficiency 89.1%

Heating World Group: Grandee Combi Condensing : W 15/22
oil : combi : condensing : wall mounted
Power rating (15 – 21 kW)
SEDBUK efficiency 89.1%

Heating World Group: Grandee Combi Condensing External : W 15/22
oil : combi : condensing : wall mounted
Power rating (15 – 21 kW)
SEDBUK efficiency 89.1%

Heating World Group: Grandee Combi Condensing : FS 23/30
oil : combi : condensing : wall mounted
Power rating (23 – 26 kW)
SEDBUK efficiency 88.6%

Heating World Group: Grandee Combi Condensing External : FS 23/30
oil : combi : condensing : wall mounted
Power rating (23 – 26 kW)
SEDBUK efficiency 88.6%

Heating World Group: Grandee Combi Condensing : W 23/28
oil : combi : condensing : wall mounted
Power rating (23 – 26 kW)
SEDBUK efficiency 88.6%

Heating World Group: Grandee Combi Condensing External : W 23/28
oil : combi : condensing : wall mounted
Power rating (23 – 26 kW)
SEDBUK efficiency 88.6%

Mistral: COD3 – C – 9012 : Outdoor Combi
oil : combi : condensing : floor mounted
Power rating (26.4 – 35.2 kW)
SEDBUK efficiency 88.6%

Mistral: CC3 – 9012 : Combi
oil : combi : condensing : floor mounted
Power rating (26.4 – 35.2 kW)
SEDBUK efficiency 88.6%

Mistral: CC4 – 1215 : Combi
oil : combi : condensing : floor mounted
Power rating (35.2 – 44 kW)
SEDBUK efficiency 88.6%

Mistral: COD4 – C – 1215 : Outdoor Combi
oil : combi : condensing : floor mounted
Power rating (35.2 – 44 kW)
SEDBUK efficiency 88.6%

This information has been collated from Manufacturers literature and the SEDBUK online database as at April 2007.

Small variations in efficiency ratings are not significant. It can be assumed that a 3% difference in rating will give a 95% confidence that the higher rated boiler is more efficient than the lower.

Listing of current combi boilers for Ideal listed in declining SEDBUK rating order.

Ideal: istor : HE325
gas : combi : condensing : floor mounted
Power Rating: (23.4 – 23.4 kW)
SEDBUK efficiency 90.9%

Ideal: istor : HE260
gas : combi : condensing : floor mounted
Power Rating: (23.4 – 23.4 kW)
SEDBUK efficiency 90.7%

Evo: HE C22/24 : HE C 22/24
gas : combi : condensing : wall mounted
Power Rating: (23.4 – 23.4 kW)
SEDBUK efficiency 90.1%

Ideal: isar : HE35
gas : combi : condensing : wall mounted
Power Rating: (23.4 – 23.4 kW)
SEDBUK efficiency 90.1%

Ideal: Isar HE 30 : HE30
gas : combi : condensing : wall mounted
Power Rating: (25.1 – 25.1 kW)
SEDBUK efficiency 90.1%

Ideal: isar : HE30
gas : combi : condensing : wall mounted
Power Rating: (23.4 – 23.4 kW)
SEDBUK efficiency 90.1%

Ideal: isar : HE30
gas : combi : condensing : wall mounted
Power Rating: (23.4 – 23.4 kW)
SEDBUK efficiency 90.1%

Evo: HE C22/35 : HE C22/35
gas : combi : condensing : wall mounted
Power Rating: (23.4 – 23.4 kW)
SEDBUK efficiency 90.1%

Ideal: isar : HE24
gas : combi : condensing : wall mounted
Power Rating: (23.4 – 23.4 kW)
SEDBUK efficiency 90.1%

Evo: HE C22/30 : HE C22/30
gas : combi : condensing : wall mounted
Power Rating: (23.3 – 23.3 kW)
SEDBUK efficiency 90.1%

Ideal: mini : HE C24
gas : combi : condensing : wall mounted
Power Rating: (24.6 – 24.6 kW)
SEDBUK efficiency 87.7%

Ideal: mini : HE C28
gas : combi : condensing : wall mounted
Power Rating: (28.3 – 28.3 kW)
SEDBUK efficiency 87.6%

Ideal: Mini : HE C32
gas : combi : condensing : wall mounted
Power Rating: (32.2 – 32.2 kW)
SEDBUK efficiency 86.8%

Ideal: excel : HE C24
gas : combi : condensing : wall mounted
Power Rating: (23.4 – 23.4 kW)
SEDBUK efficiency 86.4%

Ideal: excel : HE C28
gas : combi : condensing : wall mounted
Power Rating: (28.0 – 28.0 kW)
SEDBUK efficiency 86.4%

Ideal: excel : HE C32
gas : combi : condensing : wall mounted
Power Rating: (32.0 – 32.0 kW)
SEDBUK efficiency 86.3%

Europa: 28 : 28 kW Combi Boiler
gas : combi : non condensing : wall mounted
Power Rating: (28 – 28 kW)
SEDBUK efficiency 79.8%

Boxer: C24 : 24kW Combi Boiler
gas : combi : non condensing : wall mounted
Power Rating: (24.3 – 24.3 kW)
SEDBUK efficiency 78.9%

Europa: 24 : 24kW Combi Boiler
gas : combi : non condensing : wall mounted
Power Rating: (24.3 – 24.3 kW)
SEDBUK efficiency 78.9%

Boxer: C28 : 28kW Combi Boiler
gas : combi : non condensing : wall mounted
Power Rating: (24.3 – 24.3 kW)
SEDBUK efficiency 78.9%

Ideal: C : 95FF
gas : combi : non condensing : wall mounted
Power Rating: (27.9 – 27.9 kW)
SEDBUK efficiency 78.5%

Ideal: C : 80FF
gas : combi : non condensing : wall mounted
Power Rating: (23.26 – 23.26 kW)
SEDBUK efficiency 78.4%

Ideal: Mini C32 : 32kW Combi Boiler
gas : combi : non condensing : wall mounted
Power Rating: (32.0 – 32.0 kW)
SEDBUK efficiency 78.3%

Ideal: Mini C28 : 28kW Combi Boiler
gas : combi : non condensing : wall mounted
Power Rating: (28 – 28 kW)
SEDBUK efficiency 78.3%

Ideal: Mini C24 : 24kW Combi Boiler
gas : combi : non condensing : wall mounted
Power Rating: (24.3 – 24.3 kW)
SEDBUK efficiency 78.2%

This information has been collated from Manufacturers literature and the SEDBUK online database as at April 2007.

Small variations in efficiency ratings are not significant. It can be assumed that a 3% difference in rating will give a 95% confidence that the higher rated boiler is more efficient than the lower.

Listing of current regular boilers for Ideal listed in declining SEDBUK rating order.

Ideal: Icos : HE36
gas : regular : condensing : wall mounted
Power Rating: (37 – 37 kW) SEDBUK efficiency 90.7%

Ideal: Icos : HE30
gas : regular : condensing : wall mounted
Power Rating: (30.1 – 30.1 kW) SEDBUK efficiency 90.7%

Ideal: Mexico : HE 36
gas : regular : condensing : floor mounted
Power Rating: (37.0 – 37.0 kW) SEDBUK efficiency 90.7%

Ideal: icos : HE15
gas : regular : condensing : wall mounted
Power Rating: (14.6 – 14.6 kW) SEDBUK efficiency 90.4%

Ideal: Maximiser : SE 42
gas : regular : condensing : wall mounted
Power Rating: (40 – 40 kW) SEDBUK efficiency 90.4%

Ideal: Imax : W60
gas : regular : condensing : wall mounted
Power Rating: (60 – 60 kW) SEDBUK efficiency 90.4%

Ideal: icos System : HE 15
gas : regular : condensing : wall mounted
Power Rating: (14.6 – 14.6 kW) SEDBUK efficiency 90.4%

Ideal: Imax : W45
gas : regular : condensing : wall mounted
Power Rating: (45 – 45 kW) SEDBUK efficiency 90.4%

Ideal: Mexico : HE15
gas : regular : condensing : floor mounted
Power Rating: (14.6 – 14.6 kW) SEDBUK efficiency 90.4%

Ideal: Mexico : HE 30
gas : regular : condensing : floor mounted
Power Rating: (30.1 – 30.1 kW) SEDBUK efficiency 90.4%

Evo: HE 16 : HE16
gas : regular : condensing : wall mounted
Power Rating: (14.6 – 14.6 kW) SEDBUK efficiency 90.4%

Evo: HE 19 : HE19
gas : regular : condensing : wall mounted
Power Rating: (18.2 – 18.2 kW) SEDBUK efficiency 90.3%

Ideal: Mexico : HE18
gas : regular : condensing : floor mounted
Power Rating: (18.2 – 18.2 kW) SEDBUK efficiency 90.3%

Evo: HE 12 : HE 12
gas : regular : condensing : wall mounted
Power Rating: (12.7 – 12.7 kW) SEDBUK efficiency 90.3%

Ideal: icos : HE18
gas : regular : condensing : wall mounted
Power Rating: (18.2 – 18.2 kW) SEDBUK efficiency 90.3%

Ideal: Icos : HE 12
gas : regular : condensing : wall mounted
Power Rating: (12.7 – 12.7 kW) SEDBUK efficiency 90.3%

Ideal: Mexico : HE 24
gas : regular : condensing : floor mounted
Power Rating: (23.4 – 23.4 kW) SEDBUK efficiency 90.2%

Ideal: Maximiser : SE 65
gas : regular : condensing : wall mounted
Power Rating: (55.1 – 55.1 kW) SEDBUK efficiency 90.2%

Ideal: icos : HE24
gas : regular : condensing : wall mounted
Power Rating: (23.4 – 23.4 kW) SEDBUK efficiency 90.2%

Ideal: icos System : HE 24
gas : regular : condensing : wall mounted
Power Rating: (23.4 – 23.4 kW) SEDBUK efficiency 90.2%

Evo: HE 22 : HE22
gas : regular : condensing : wall mounted
Power Rating: (23.4 – 23.4 kW) SEDBUK efficiency 90.2%

Ideal: Classic : HE 18
gas : regular : condensing : wall mounted
Power Rating: (18 – 18.0 kW) SEDBUK efficiency 87.5%

Optia: HE 18 :
gas : regular : condensing : wall mounted
Power Rating: (18 – 18.0 kW) SEDBUK efficiency 87.5%

Optia: HE 12 :
gas : regular : condensing : wall mounted
Power Rating: (12 – 12.0 kW) SEDBUK efficiency 87.4%

Ideal: Classic : HE 12
gas : regular : condensing : wall mounted
Power Rating: (12 – 12.0 kW) SEDBUK efficiency 87.4%

Ideal: Classic : HE 9
gas : regular : condensing : wall mounted
Power Rating: (9 – 9.0 kW) SEDBUK efficiency 87.1%

Optia: HE 9 :
gas : regular : condensing : wall mounted
Power Rating: 9.0 kW SEDBUK efficiency 87.1%

Optia: HE 15 :
gas : regular : condensing : wall mounted
Power Rating: (15 – 15.0 kW) SEDBUK efficiency 86.4%

Ideal: Classic : HE 15
gas : regular : condensing : wall mounted
Power Rating: (15 – 15.0 kW) SEDBUK efficiency 86.4%

Ideal: Concord : CXC48
gas : regular : condensing : floor mounted
Power Rating: (48.83 – 48.83 kW) SEDBUK efficiency 85.8%

Ideal: Concord : CXC70
gas : regular : condensing : floor mounted
Power Rating: (69.84 – 69.84 kW) SEDBUK efficiency 85.5%

Ideal: Concord CXSD : 40/H
gas : regular : non condensing : floor mounted
Power Rating: (43.5 – 43.5 kW) SEDBUK efficiency 80.4%

Ideal: Concord CXS : 40/H
gas : regular : non condensing : floor mounted
Power Rating: (43.5 – 43.5 kW) SEDBUK efficiency 80.4%

Ideal: Concord CXS : 60/H
gas : regular : non condensing : floor mounted
Power Rating: (65.2 – 65.2 kW) SEDBUK efficiency 80.3%

Ideal: Concord CXSD : 60/H
gas : regular : non condensing : floor mounted
Power Rating: (65.2 – 65.2 kW) SEDBUK efficiency 80.3%

Ideal: Concord CXS : 50/H
gas : regular : non condensing : floor mounted
Power Rating: (54.3 – 54.3 kW) SEDBUK efficiency 80.1%

Ideal: Concord CXSD : 50/H
gas : regular : non condensing : floor mounted
Power Rating: (54.3 – 54.3 kW) SEDBUK efficiency 80.1%

Ideal: Classic Slimline : SE9 FF
gas : regular : non condensing : wall mounted
Power Rating: 8.8 kW SEDBUK efficiency 79.9%

Ideal: Classic : SE15 RS
gas : regular : non condensing : wall mounted
Power Rating: 14.7 kW SEDBUK efficiency 79.9%

Ideal: Concord CXA : 40/H
gas : regular : non condensing : floor mounted
Power Rating: 43.5 kW SEDBUK efficiency 79.9%

Ideal: Mexico Super : 470 FF
gas : regular : non condensing : floor mounted
Power Rating: 20.5 kW SEDBUK efficiency 79.9%

Ideal: Concord CXA : 50/H
gas : regular : non condensing : floor mounted
Power Rating: 54.3 kW SEDBUK efficiency 79.9%

Ideal: Classic Slimline : SE15 FF
gas : regular : non condensing : wall mounted
Power Rating: 14.7 kW SEDBUK efficiency 79.9%

Ideal: Concord CXA : 60/H
gas : regular : non condensing : floor mounted
Power Rating: 65.2 kW SEDBUK efficiency 79.8%

Ideal: Mexico Super : CF 465
gas : regular : non condensing : floor mounted
Power Rating: 19.1 kW SEDBUK efficiency 79.7%

Ideal: Mexico Super : 480 FF
gas : regular : non condensing : floor mounted
Power Rating: 23.4 kW SEDBUK efficiency 79.7%

Ideal: Classic Slimline : SE18 FF
gas : regular : non condensing : wall mounted
Power Rating: 17.6 kW SEDBUK efficiency 79.7%

Ideal: Classic : SE15 FF
gas : regular : non condensing : wall mounted
Power Rating: 14.7 kW SEDBUK efficiency 79.6%

Optia: FF50 :
gas : regular : non condensing : wall mounted
Power Rating: 14.7 kW SEDBUK efficiency 79.6%

Ideal: Classic : SE15 FF Silver
gas : regular : non condensing : wall mounted
Power Rating: 14.7 kW SEDBUK efficiency 79.6%

Ideal: Mexico Super : 80FF
gas : regular : non condensing : floor mounted
Power Rating: (20.5 – 23.4 kW) SEDBUK efficiency 79.4%

Ideal: Mexico Super : RS 4125
gas : regular : non condensing : floor mounted
Power Rating: 36.6 kW SEDBUK efficiency 79.4%

Ideal: Classic : SE9 FF
gas : regular : non condensing : wall mounted
Power Rating: 8.8 kW SEDBUK efficiency 79.4%

Ideal: Classic : SE9 FF Silver
gas : regular : non condensing : wall mounted
Power Rating: 8.8 kW SEDBUK efficiency 79.4%

Optia: FF30 :
gas : regular : non condensing : wall mounted
Power Rating: 8.8 kW SEDBUK efficiency 79.4%

Ideal: Mexico Super : 460 FF
gas : regular : non condensing : floor mounted
Power Rating: 17.6 kW SEDBUK efficiency 79.2%

Ideal: Classic Slimline : SE12 FF
gas : regular : non condensing : wall mounted
Power Rating: 11.7 kW SEDBUK efficiency 79.2%

Ideal: Classic : FF 360 LF
gas : regular : non condensing : wall mounted
Power Rating: 17.6 kW SEDBUK efficiency 79.1%

Ideal: Classic : FF 340 LF
gas : regular : non condensing : wall mounted
Power Rating: 11.7 kW SEDBUK efficiency 79.1%

Ideal: Mexico Super : RS 450
gas : regular : non condensing : floor mounted
Power Rating: 14.7 kW SEDBUK efficiency 79.1%

Ideal: Mexico Super : RS 485
gas : regular : non condensing : floor mounted
Power Rating: 24.9 kW SEDBUK efficiency 79.1%

Ideal: Mexico Super : 450 FF
gas : regular : non condensing : floor mounted
Power Rating: 14.7 kW SEDBUK efficiency 79.0%

Ideal: Classic : SE18 RS
gas : regular : non condensing : wall mounted
Power Rating: 17.6 kW SEDBUK efficiency 79.0%

Ideal: Mexico Super : RS 470
gas : regular : non condensing : floor mounted
Power Rating: 20.5 kW SEDBUK efficiency 79.0%

Ideal: Mexico Super : CF 4120
gas : regular : non condensing : floor mounted
Power Rating: 35.2 kW SEDBUK efficiency 79.0%

Ideal: Mexico Super : RS 4100
gas : regular : non condensing : floor mounted
Power Rating: 29.3 kW SEDBUK efficiency 79.0%

Ideal: Mexico Super : RS 460
gas : regular : non condensing : floor mounted
Power Rating: 17.6 kW SEDBUK efficiency 79.0%

Ideal: Mexico Super : CF 475
gas : regular : non condensing : floor mounted
Power Rating: (22 – 22.0 kW) SEDBUK efficiency 78.9%

Ideal: Classic : SE12 RS
gas : regular : non condensing : wall mounted
Power Rating: 11.7 kW SEDBUK efficiency 78.9%

Ideal: Mexico Super : 4100 FF
gas : regular : non condensing : floor mounted
Power Rating: 29.3 kW SEDBUK efficiency 78.9%

Ideal: Mexico Super : CF 495
gas : regular : non condensing : floor mounted
Power Rating: 27.8 kW SEDBUK efficiency 78.8%

Ideal: Classic : SE12 FF Silver
gas : regular : non condensing : wall mounted
Power Rating: 11.7 kW SEDBUK efficiency 78.6%

Ideal: Classic : SE12 FF
gas : regular : non condensing : wall mounted
Power Rating: 11.7 kW SEDBUK efficiency 78.6%

Ideal: Mexico Super : RS 440
gas : regular : non condensing : floor mounted
Power Rating: 11.7 kW SEDBUK efficiency 78.6%

Optia: FF40 :
gas : regular : non condensing : wall mounted
Power Rating: 11.7 kW SEDBUK efficiency 78.6%

Ideal: Mexico Super : CF 4140
gas : regular : non condensing : floor mounted
Power Rating: (41 – 41.0 kW) SEDBUK efficiency 78.6%

Ideal: Mexico Super : 4125 FF
gas : regular : non condensing : floor mounted
Power Rating: 36.6 kW SEDBUK efficiency 78.5%

Ideal: Mexico Slimline : CF 440
gas : regular : non condensing : floor mounted
Power Rating: 11.7 kW SEDBUK efficiency 78.5%

Ideal: Mexico Super : CF 445
gas : regular : non condensing : floor mounted
Power Rating: 13.2 kW SEDBUK efficiency 78.5%

Ideal: Mexico Super : CF 455
gas : regular : non condensing : floor mounted
Power Rating: 16.1 kW SEDBUK efficiency 78.5%

Ideal: Classic : SE21 FF
gas : regular : non condensing : wall mounted
Power Rating: 20.5 kW SEDBUK efficiency 78.5%

Ideal: Classic : SE21 FF Silver
gas : regular : non condensing : wall mounted
Power Rating: 20.5 kW SEDBUK efficiency 78.5%

Optia: FF70 :
gas : regular : non condensing : wall mounted
Power Rating: 20.5 kW SEDBUK efficiency 78.5%

Ideal: Mini S28 : 28kW System Boiler
gas : regular : non condensing : wall mounted
Power Rating: (28 – 28 kW) SEDBUK efficiency 78.4%

Ideal: Mexico Slimline : RS 445
gas : regular : non condensing : floor mounted
Power Rating: 13.2 kW SEDBUK efficiency 78.4%

Ideal: Classic : FF 350 LF
gas : regular : non condensing : wall mounted
Power Rating: 14.7 kW SEDBUK efficiency 78.4%

Ideal: Classic : SE9 RS
gas : regular : non condensing : wall mounted
Power Rating: 8.8 kW SEDBUK efficiency 78.3%

Ideal: Classic : SE18 FF Silver
gas : regular : non condensing : wall mounted
Power Rating: 17.6 kW SEDBUK efficiency 78.3%

Ideal: Classic : SE18 FF
gas : regular : non condensing : wall mounted
Power Rating: 17.6 kW SEDBUK efficiency 78.3%

Optia: FF60 :
gas : regular : non condensing : wall mounted
Power Rating: 17.6 kW SEDBUK efficiency 78.3%

Ideal: Mexico Super : 440 FF
gas : regular : non condensing : floor mounted
Power Rating: 11.7 kW SEDBUK efficiency 78.3%

Ideal: Mini S24 : 24kW System Boiler
gas : regular : non condensing : wall mounted
Power Rating: (24.3 – 24.3 kW) SEDBUK efficiency 78.3%

Ideal: Classic : SE24 FF
gas : regular : non condensing : wall mounted
Power Rating: 23.4 kW SEDBUK efficiency 78.1%

Ideal: Classic : SE24 FF Silver
gas : regular : non condensing : wall mounted
Power Rating: 23.4 kW SEDBUK efficiency 78.1%

Optia: FF80 :
gas : regular : non condensing : wall mounted
Power Rating: 23.4 kW SEDBUK efficiency 78.1%

Ideal: Classic : SE30 FF
gas : regular : non condensing : wall mounted
Power Rating: 29.3 kW SEDBUK efficiency 78.0%

Ideal: Classic : SE30 FF Silver
gas : regular : non condensing : wall mounted
Power Rating: 29.3 kW SEDBUK efficiency 78.0%

Optia: FF100 :
gas : regular : non condensing : wall mounted
Power Rating: 29.3 kW SEDBUK efficiency 78.0%

Ideal: Mexico Super : 125FF
gas : regular : non condensing : floor mounted
Power Rating: (29.3 – 36.6 kW) SEDBUK efficiency 77.9%

This information has been collated from Manufacturers literature and the SEDBUK online database as at April 2007.

Small variations in efficiency ratings are not significant. It can be assumed that a 3% difference in rating will give a 95% confidence that the higher rated boiler is more efficient than the lower.

Worcester Green Star is one of the leading boiler manufacturers and has the making efficient boilers for many years. There are a large number of boilers with the range and we have listed the most popular models with the for your information.

Listing of current regular boilers for Worcester listed in declining SEDBUK rating order.

Worcester: Greenstar R : 28 HE System
gas : regular : condensing : wall mounted
Power Rating: (27.7 – 27.7 kW)
SEDBUK efficiency 90.7%

Worcester: Greenstar R : 29 HE Conventional
gas : regular : condensing : wall mounted
Power Rating: (27.7 – 27.7 kW)
SEDBUK efficiency 90.7%

Worcester: Greenstar 29HE Conventional : ZB 7-29
gas : regular : condensing : wall mounted
Power Rating: (29 – 29 kW)
SEDBUK efficiency 90.7%

Worcester: Greenstar Cdi : 30 Cdi Conventional
gas : regular : condensing : wall mounted
Power Rating: (30.0 – 30.0 kW)
SEDBUK efficiency 90.3%

Worcester: Greenstar Cdi : 30 Cdi System
gas : regular : condensing : wall mounted
Power Rating: (30.0 – 30.0 kW)
SEDBUK efficiency 90.3%

Worcester: Greenstar : 24 Ri
gas : regular : condensing : wall mounted
Power Rating: (24 – 24 kW)
SEDBUK efficiency 90.2%

Worcester: Greenstar Cdi : 40 Cdi Conventional
gas : regular : condensing : wall mounted
Power Rating: (40.8 – 40.8 kW)
SEDBUK efficiency 90.2%

Worcester: Greenstar : 24i System
gas : regular : condensing : wall mounted
Power Rating: (24 – 24 kW)
SEDBUK efficiency 90.2%

Worcester: Greenstar R : 40 HE Conventional
gas : regular : condensing : wall mounted
Power Rating: (40.0 – 40.0 kW)
SEDBUK efficiency 90.1%

Worcester: Greenstar : 12 Ri
gas : regular : condensing : wall mounted
Power Rating: (12.00 – 12.00 kW)
SEDBUK efficiency 90.1%

Worcester: Greenstar : 12i System
gas : regular : condensing : wall mounted
Power Rating: (12 – 12 kW)
SEDBUK efficiency 90.1%

Worcester: Greenstar : 18Ri
gas : regular : condensing : wall mounted
Power Rating: (18.00 – 18.00 kW)
SEDBUK efficiency 90.1%

Worcester: Greenstar : 15Ri
gas : regular : condensing : wall mounted
Power Rating: (15.00 – 15.00 kW)
SEDBUK efficiency 90.1%

Worcester: 14/19 CBi : RSF
gas : regular : non condensing : wall mounted
Power Rating: (14 – 19.05 kW)
SEDBUK efficiency 79.4%

Worcester: 15 Sbi : RSF
gas : regular : non condensing : wall mounted
Power Rating: (6 – 15 kW)
SEDBUK efficiency 79.1%

Worcester: 9/14 CBi : RSF
gas : regular : non condensing : wall mounted
Power Rating: (9 – 14 kW)
SEDBUK efficiency 78.5%

Worcester: 19/24 CBi : RSF
gas : regular : non condensing : wall mounted
Power Rating: (19.05 – 23.45 kW)
SEDBUK efficiency 78.4%

Worcester: 24 Sbi : RSF
gas : regular : non condensing : wall mounted
Power Rating: (15 – 24 kW)
SEDBUK efficiency 78.3%

This information has been collated from Manufacturers literature and the SEDBUK online database as at April 2007.

Small variations in efficiency ratings are not significant. It can be assumed that a 3% difference in rating will give a 95% confidence that the higher rated boiler is more efficient than the lower.