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.