I think I know the answer to this is to do nothing but...
The scene a 60s detached 3 bedroom house occupied by genteel, elderly, active thinking but near housebound lady I have recently met, previously heated by a redfyre back boiler, now broken with a melted grate. I botched a repair with nickel arc rods but the internal stresses caused it to break elsewhere and I haven't found a replacement. I can try welding again (with a heat soak) or fabricate a new one with a cast iron plate but it is 40 years old and I worry about the flue. It purported to heat a room and 3 radiators by gravity feed. The only good reason to retain it is that she has 2 tonnes of anthracite in the bunker.
In the meanwhile she is using 5 convector heaters and one of these with a 1kW radiant bar on. I've checked her meter reading and it is
1000 units over the electricity company's estimate for the quarter and it's not even got cold yet!At 80+ she will never see a return on the things I want to suggest, like a small gas boiler (in the garage as she will not put up with any noises) and replaced radiators, loft and cavity wall insulation.
I have no doubt the house would be totally renovated by any incomers so any work will not add to the value and she is unlikely to move willingly and the trauma is not justified.
Any suggestions on the most economic solution?
AJH