Just to add,
no - were in the country, and the house is nearly 40 years old. Boiler is probably not far off that either.
so for gas, it would be a tank. I'm toying with the idea of putting in a gas range too, so it could feed both, and we'd have it on when we get home. I heard mentioned before that you can get a gas boiler fitted for free? is that still the case?