Upgrading an old boiler without controls, to a new A-rated condensing boiler with a programmer, room thermostat and thermostatic radiator controls (TRVs) could save you:
| 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 (70-78%) | £215 | £360 | £180 | £175 | £90 |
| D (<78-82%) | £175 | £300 | £145 | £145 | £70 |
