
The only time I'd advise a heat pump is on a new build where you are putting in underfloor heating, AND you are generating all your own electricity - heat pumps output "low grade" energy - relatively low temperature water, really only useable with underfloor heating. Also it is ludicrously expensive (both to install as a "retro-fit and to run) - the heat pump salesmen rattle on about the 3 "free" units, and omit to mention that the energy you have to put in to get them is the most expensive sort.........

What I'd do in your shoes is to get a good woodburner/backboiler -possibly with a wood-fired range in the kitchen (as well/instead of the woodburner), properly sized solar hot water system, all feeding into a decent sized thermal store which also contains an immersion heater (for emergency use only)........

The beauty of such a system is that it is affordable relative to the other technologies, it is low tech and reliable too!
