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

Worcester: Greenstar Highflow : 440
gas : combi : condensing : floor mounted
Power Rating: (29.2 – 29.2 kW)
SEDBUK efficiency 91.0%

Worcester: Greenstar R : 30 HE Combi
gas : combi : condensing : wall mounted
Power Rating: (29.5 – 29.5 kW)
SEDBUK efficiency 90.6%

Worcester: Greenstar R : 25 HE Combi
gas : combi : condensing : wall mounted
Power Rating: (27.5 – 27.5 kW)
SEDBUK efficiency 90.6%

Worcester: Greenstar R : 30HE Plus Combi
gas : combi : condensing : wall mounted
Power Rating: (29.5 – 29.5 kW)
SEDBUK efficiency 90.6%

Worcester: Greenstar CDi : 25 Cdi
gas : combi : condensing : wall mounted
Power Rating: (25 – 25 kW)
SEDBUK efficiency 90.3%

Worcester: Greenstar R : 35 HE Plus Combi
gas : combi : condensing : wall mounted
Power Rating: (35.5 – 35.5 kW)
SEDBUK efficiency 90.3%

Worcester: Greenstar CDi : 31 CDi
gas : combi : condensing : wall mounted
Power Rating: (30 – 30 kW)
SEDBUK efficiency 90.2%

Worcester: Greenstar CDi : 27 CDi
gas : combi : condensing : wall mounted
Power Rating: (26.2 – 26.2 kW)
SEDBUK efficiency 90.2%

Worcester: Greenstar : 37 CDi
gas : combi : condensing : wall mounted
Power Rating: (30 – 30 kW)
SEDBUK efficiency 90.2%

Worcester: Greenstar : 42 CDi
gas : combi : condensing : wall mounted
Power Rating: (30 – 30 kW)
SEDBUK efficiency 90.2%

Worcester: Greenstar CDi : 30 CDi
gas : combi : condensing : wall mounted
Power Rating: (30 – 30 kW)
SEDBUK efficiency 90.2%

Worcester: Greenstar CDi : 35 CDi
gas : combi : condensing : wall mounted
Power Rating: (30 – 30 kW)
SEDBUK efficiency 90.2%

Worcester: Greenstar Cdi : 40 Cdi
gas : combi : condensing : wall mounted
Power Rating: (30.0 – 30.0 kW)
SEDBUK efficiency 90.2%

Worcester: Greenstar : 28i junior
gas : combi : condensing : wall mounted
Power Rating: (24 – 24 kW)
SEDBUK efficiency 90.1%

Worcester: Greenstar : 24i junior
gas : combi : condensing : wall mounted
Power Rating: (24 – 24 kW)
SEDBUK efficiency 90.1%

Worcester: Greenstar : 25 Si
gas : combi : condensing : wall mounted
Power Rating: (24 – 24 kW)
SEDBUK efficiency 90.1%

Worcester: Greenstar : 30 Si
gas : combi : condensing : wall mounted
Power Rating: (24 – 24 kW)
SEDBUK efficiency 90.1%

Worcester: Greenstar R : 40 HE Plus Combi
gas : combi : condensing : wall mounted
Power Rating: (40.0 – 40.0 kW)
SEDBUK efficiency 90.0%

Worcester: 26 CDi Xtra : RSF – L
gas : combi : condensing : wall mounted
Power Rating: (26 – 26 kW)
SEDBUK efficiency 87.1%

Worcester: Highflow 400 Electronic BF : BF
gas : combi : non condensing : floor mounted
Power Rating: (24 – 24 kW)
SEDBUK efficiency 80.0%

Worcester: 24 Cdi : BF
gas : combi : non condensing : wall mounted
Power Rating: (24 – 24 kW)
SEDBUK efficiency 79.4%

Worcester: 28 Cdi : RSF
gas : combi : non condensing : wall mounted
Power Rating: (24 – 24 kW)
SEDBUK efficiency 78.9%

Worcester: 28i Junior :
gas : combi : non condensing : wall mounted
Power Rating: (27.5 – 27.5 kW)
SEDBUK efficiency 78.9%

Worcester: 28 LE : RSF
gas : combi : non condensing : wall mounted
Power Rating: (24 – 24 kW)
SEDBUK efficiency 78.9%

Worcester: Highflow 400 Electronic RSF : RSF
gas : combi : non condensing : floor mounted
Power Rating: (24 – 24 kW)
SEDBUK efficiency 78.8%

Worcester: 35 CDi II : RSF
gas : combi : non condensing : wall mounted
Power Rating: (27.5 – 27.5 kW)
SEDBUK efficiency 78.5%

Worcester: Highflow 400 Electronic OF : OF
gas : combi : non condensing : floor mounted
Power Rating: (24 – 24 kW)
SEDBUK efficiency 78.5%

Worcester: 28 SI II : RSF
gas : combi : non condensing : wall mounted
Power Rating: (8.1 – 8.1 kW)
SEDBUK efficiency 78.4%

Worcester: 24i – L : RSF
gas : combi : non condensing : wall mounted
Power Rating: (23.4 – 23.4 kW)
SEDBUK efficiency 78.3%

Worcester: 24 CDi : RSF-L
gas : combi : non condensing : wall mounted
Power Rating: (24 – 24 kW)
SEDBUK efficiency 78.1%

Worcester: 24 SI II : RSF
gas : combi : non condensing : wall mounted
Power Rating: (24 – 24 kW)
SEDBUK efficiency 78.1%

Worcester: 24 CDi – L : OF
gas : combi : non condensing : wall mounted
Power Rating: (24 – 24 kW)
SEDBUK efficiency 78.1%

Worcester: 28i : RSF
gas : combi : non condensing : wall mounted
Power Rating: (28 – 28 kW)
SEDBUK efficiency 78.0%

Worcester: 24i Junior :
gas : combi : non condensing : wall mounted
Power Rating: (23.5 – 23.5 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.


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