Advice on space heating passive house
We're in our second winter in an MBC timber frame house.
5 bed, 4 kids. 240m2 approx
It has UFH pipes installed but I experimentally haven't connected them up.
I think it's OK (with thermal longjohns etc ), but some of the less robust members of my house feel we need "proper" heating.
It was 15 degrees inside this am (-2 outside overnight).
We do have a plug-in panel heater which will warm a single room quickly.
We have a 9kW Sunamp unit which supplies hot water
Right, thinking cap on.
I have E7 heating into a 200lt water cylinder. Two 3 kW elements (nominal). One at bottom and one at top of cylinder. You may have seen my charts about the temperature gradient elsewhere.
If I where to wire those two elements in series, and with a bit of experimentation with the two built in thermostats, I could possibly run them off a very cheap PV installation (maybe modules hanging on walls) and a cheap 2 kW inverter (about 40 quid).
The thermostats coul