How much could I save each year when replacing my boiler?

This will depend on how old and inefficient your existing boiler is and the fuel your boiler uses. Below are some examples of potential savings for a home heated by gas central heating.

1.) England - Upgrading an old gas boiler without controls, with a new A-rated condensing boiler with a programmer, room thermostat and thermostatic radiator controls (TRVs) could save you:
2.) Wales - Upgrading an old gas boiler with a programmer and room thermostat, with a new A-rated condensing boiler with a programmer, room thermostat and thermostatic radiator controls (TRVs) could save you:
3.) Northern Ireland
Old boiler rating Semi detached house Detached house Detached bungalow Mid terrace house Mid floor flat
G (<70%) £340 £570 £290 £280 £145
F (70-74%) £255 £430 £215 £210 £105
E (74-78%) £215 £360 £180 £175 £90
D (78-82%) £175 £300 £145 £145 £70
*These are estimated figures based on installing a new A-rated condensing boiler with a programmer, room thermostat and thermostatic radiator controls (TRVs) in a gas-heated home from an older boiler without controls. Savings will vary depending on the size and thermal performance of your home. http://www.energysavingtrust.org.uk/domestic/replacing-my-boiler
Old boiler rating Semi detached house Detached house Detached bungalow Mid terrace house Mid floor flat
G (<70%) £225 £370 £190 £185 £100
F (70?74%) £155 £255 £125 £130 £70
E (74?78%) £120 £195 £100 £100 £50
D (78?82%) £90 £145 £70 £75 £40
*These are estimated figures based on installing a new A-rated condensing boiler with a programmer, room thermostat and thermostatic radiator controls (TRVs) in a gas-heated home from an older boiler with a programmer and room thermostat. Savings will vary depending on the size and thermal performance of your home. http://www.energysavingtrust.org.uk/domestic/replacing-my-boiler
Old boiler rating Semi detached house Detached house Detached bungalow Mid terrace house Mid floor flat
G (<70%) £345 £560 £295 £280 £150
F (70?74%) £255 £425 £215 £210 £110
E (74?78%) £215 £355 £180 £175 £90
D (78?82%) £175 £295 £145 £145 £70
*These are estimated figures based on installing a new A-rated condensing boiler and full set of heating controls in an oil-heated home. Savings will vary depending on the size and thermal performance of your home. http://www.energysavingtrust.org.uk/domestic/replacing-my-boiler