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

Ideal: istor : HE325
gas : combi : condensing : floor mounted
Power Rating: (23.4 - 23.4 kW)
SEDBUK efficiency 90.9%

Ideal: istor : HE260
gas : combi : condensing : floor mounted
Power Rating: (23.4 - 23.4 kW)
SEDBUK efficiency 90.7%

Evo: HE C22/24 : HE C 22/24
gas : combi : condensing : wall mounted
Power Rating: (23.4 - 23.4 kW)
SEDBUK efficiency 90.1%

Ideal: isar : HE35
gas : combi : condensing : wall mounted
Power Rating: (23.4 - 23.4 kW)
SEDBUK efficiency 90.1%

Ideal: Isar HE 30 : HE30
gas : combi : condensing : wall mounted
Power Rating: (25.1 - 25.1 kW)
SEDBUK efficiency 90.1%

Ideal: isar : HE30
gas : combi : condensing : wall mounted
Power Rating: (23.4 - 23.4 kW)
SEDBUK efficiency 90.1%

Ideal: isar : HE30
gas : combi : condensing : wall mounted
Power Rating: (23.4 - 23.4 kW)
SEDBUK efficiency 90.1%

Evo: HE C22/35 : HE C22/35
gas : combi : condensing : wall mounted
Power Rating: (23.4 - 23.4 kW)
SEDBUK efficiency 90.1%

Ideal: isar : HE24
gas : combi : condensing : wall mounted
Power Rating: (23.4 - 23.4 kW)
SEDBUK efficiency 90.1%

Evo: HE C22/30 : HE C22/30
gas : combi : condensing : wall mounted
Power Rating: (23.3 - 23.3 kW)
SEDBUK efficiency 90.1%

Ideal: mini : HE C24
gas : combi : condensing : wall mounted
Power Rating: (24.6 - 24.6 kW)
SEDBUK efficiency 87.7%

Ideal: mini : HE C28
gas : combi : condensing : wall mounted
Power Rating: (28.3 - 28.3 kW)
SEDBUK efficiency 87.6%

Ideal: Mini : HE C32
gas : combi : condensing : wall mounted
Power Rating: (32.2 - 32.2 kW)
SEDBUK efficiency 86.8%

Ideal: excel : HE C24
gas : combi : condensing : wall mounted
Power Rating: (23.4 - 23.4 kW)
SEDBUK efficiency 86.4%

Ideal: excel : HE C28
gas : combi : condensing : wall mounted
Power Rating: (28.0 - 28.0 kW)
SEDBUK efficiency 86.4%

Ideal: excel : HE C32
gas : combi : condensing : wall mounted
Power Rating: (32.0 - 32.0 kW)
SEDBUK efficiency 86.3%

Europa: 28 : 28 kW Combi Boiler
gas : combi : non condensing : wall mounted
Power Rating: (28 - 28 kW)
SEDBUK efficiency 79.8%

Boxer: C24 : 24kW Combi Boiler
gas : combi : non condensing : wall mounted
Power Rating: (24.3 - 24.3 kW)
SEDBUK efficiency 78.9%

Europa: 24 : 24kW Combi Boiler
gas : combi : non condensing : wall mounted
Power Rating: (24.3 - 24.3 kW)
SEDBUK efficiency 78.9%

Boxer: C28 : 28kW Combi Boiler
gas : combi : non condensing : wall mounted
Power Rating: (24.3 - 24.3 kW)
SEDBUK efficiency 78.9%

Ideal: C : 95FF
gas : combi : non condensing : wall mounted
Power Rating: (27.9 - 27.9 kW)
SEDBUK efficiency 78.5%

Ideal: C : 80FF
gas : combi : non condensing : wall mounted
Power Rating: (23.26 - 23.26 kW)
SEDBUK efficiency 78.4%

Ideal: Mini C32 : 32kW Combi Boiler
gas : combi : non condensing : wall mounted
Power Rating: (32.0 - 32.0 kW)
SEDBUK efficiency 78.3%

Ideal: Mini C28 : 28kW Combi Boiler
gas : combi : non condensing : wall mounted
Power Rating: (28 - 28 kW)
SEDBUK efficiency 78.3%

Ideal: Mini C24 : 24kW Combi Boiler
gas : combi : non condensing : wall mounted
Power Rating: (24.3 - 24.3 kW)
SEDBUK efficiency 78.2%

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.