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.