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.


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