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

Potterton: Promax SL : 15
gas : regular : condensing : wall mounted
Power Rating: (15.24 - 15.24 kW)
SEDBUK efficiency 91.3%

Potterton: Promax : 15/2 HE Plus
gas : regular : condensing : wall mounted
Power Rating: (15.24 - 15.24 kW)
SEDBUK efficiency 91.3%

Potterton: Promax SL : 24
gas : regular : condensing : wall mounted
Power Rating: (22.00 - 22.00 kW)
SEDBUK efficiency 90.9%

Potterton: Promax SL : 30
gas : regular : condensing : wall mounted
Power Rating: (30.18 - 30.18 kW)
SEDBUK efficiency 90.9%

Potterton: Promax FSB : 30 HE
gas : regular : condensing : floor mounted
Power Rating: (30.18 - 30.18 kW)
SEDBUK efficiency 90.9%

Potterton: Promax : 30 HE Plus
gas : regular : condensing : wall mounted
Power Rating: (30.18 - 30.18 kW)
SEDBUK efficiency 90.9%

Potterton: Promax : 24/2 HE Plus
gas : regular : condensing : wall mounted
Power Rating: (22.0 - 22.0 kW)
SEDBUK efficiency 90.9%

Potterton: Promax SL : 12
gas : regular : condensing : wall mounted
Power Rating: (11.82 - 11.82 kW)
SEDBUK efficiency 90.5%

Potterton: Promax : 12 HE Plus
gas : regular : condensing : wall mounted
Power Rating: (11.82 - 11.82 kW)
SEDBUK efficiency 90.5%

Potterton: Promax SL : 18
gas : regular : condensing : wall mounted
Power Rating: (17.81 - 17.81 kW)
SEDBUK efficiency 90.4%

Potterton: Promax : 18 HE Plus
gas : regular : condensing : wall mounted
Power Rating: (17.81 - 17.81 kW)
SEDBUK efficiency 90.4%

Potterton: Promax System : 12 HE Plus
gas : regular : condensing : wall mounted
Power Rating: (12 - 12 kW)
SEDBUK efficiency 90.2%

Potterton: Promax System : 15 HE Plus
gas : regular : condensing : wall mounted
Power Rating: (15 - 15 kW)
SEDBUK efficiency 90.2%

Potterton: Promax System : 18 HE Plus
gas : regular : condensing : wall mounted
Power Rating: (18 - 18 kW)
SEDBUK efficiency 90.2%

Potterton: Promax System : 32 HE Plus
gas : regular : condensing : wall mounted
Power Rating: (32 - 32 kW)
SEDBUK efficiency 90.1%

Potterton: Promax System : 24 HE Plus
gas : regular : condensing : wall mounted
Power Rating: (24 - 24 kW)
SEDBUK efficiency 90.1%

Potterton: Performa System : 24 HE
gas : regular : condensing : wall mounted
Power Rating: (24.0 - 24.0 kW)
SEDBUK efficiency 87.4%

Potterton: Performa System : 18 HE
gas : regular : condensing : wall mounted
Power Rating: (18.0 - 18.0 kW)
SEDBUK efficiency 87.4%

Potterton: Performa System : 28 HE
gas : regular : condensing : wall mounted
Power Rating: (28.0 - 28.0 kW)
SEDBUK efficiency 87.3%

Potterton: Performa System : 12 HE
gas : regular : condensing : wall mounted
Power Rating: (12.0 - 12.0 kW)
SEDBUK efficiency 86.8%

Potterton: Suprima : 40 HE
gas : regular : condensing : wall mounted
Power Rating:11.78 kW
SEDBUK efficiency 86.4%

Potterton: Suprima : 60 HE
gas : regular : condensing : wall mounted
Power Rating:17.72 kW
SEDBUK efficiency 86.2%

Potterton: Suprima : 70 HE
gas : regular : condensing : wall mounted
Power Rating:20.68 kW
SEDBUK efficiency 86.2%

Potterton: Suprima : 80 HE
gas : regular : condensing : wall mounted
Power Rating:23.63 kW
SEDBUK efficiency 86.2%

Potterton: Suprima : 50 HE
gas : regular : condensing : wall mounted
Power Rating:14.76 kW
SEDBUK efficiency 86.2%

Potterton: Suprima : 30 HE
gas : regular : condensing : wall mounted
Power Rating:8.82 kW
SEDBUK efficiency 86.1%

Potterton: Suprima : 80L
gas : regular : non condensing : wall mounted
Power Rating:23.4 kW
SEDBUK efficiency 78.8%

Potterton: Kingfisher MF : RSL50
gas : regular : non condensing : floor mounted
Power Rating: 14.65 kW
SEDBUK efficiency 78.5%

Potterton: Kingfisher MF : CFL50
gas : regular : non condensing : floor mounted
Power Rating: 14.65 kW
SEDBUK efficiency 78.5%

Potterton: Kingfisher MF : CFL80
gas : regular : non condensing : floor mounted
Power Rating: 23.45 kW
SEDBUK efficiency 78.3%

Potterton: Performa System : 28e
gas : regular : non condensing : wall mounted
Power Rating: (29.4 - 29.4 kW)
SEDBUK efficiency 78.2%

Potterton: Kingfisher MF : RSL80
gas : regular : non condensing : floor mounted
Power Rating: 23.45 kW
SEDBUK efficiency 78.2%

Potterton: Suprima : 50L
gas : regular : non condensing : wall mounted
Power Rating: 14.7 kW
SEDBUK efficiency 78.1%

Potterton: Suprima : 60L
gas : regular : non condensing : wall mounted
Power Rating: 17.6 kW
SEDBUK efficiency 78.1%

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.