SO – Just looking at your calculations –
switching to a new boiler would save approx £200 per year on our bills (approx 2-3 months of the year), but the payback period would be 10-15 years
So you reckon a new boiler would cost £2000 – £3000 fitted?
If it's a simple direct replacement, it shouldn't be that expensive. (if there's more to it than that, please ignore me!)
We had ours moved to the garage, all the water and gas pipes rerouted, a new radiator (Different location) and the old rad installed in the garage, and one of these magnetic sludge traps installed for £3000 (4 days work) all in…. So £2600 after the rebate.
And that's a Worcester Bosch accredited plumber and a top of the range WB CDi boiler. This was about 2-3 months ago.
Just FYI, like! 🙂