We actually have a large, sunny property with a massive lawn and a huge sun-facing roof, so we're thinking a heat pump and solar panels. We have passive-solar, already, so the water is prewarmed, at least.

We have a big water boiler, but we have radiators and floor heating, that use it.

We have a woodshop stove with a warming plate, in one room, but we might replace that with a modern cooking-oven with glass doors. We have a free source of wood (our relatives own a forests), but not for enough wood to heat the entire house. We just have the stack for the oven.

We also want a home battery and a plug for an electric car in the garage.