For houses and flats

In a flat, one wall-mounted unit per room is usually enough. With more rooms, multi split connects several indoor units to a single outdoor unit, so only one stays on the facade.

For heating a whole house through radiators or underfloor heating there is the air-to-water heat pump, and a Velt thermostat lets you run the heating from your phone.

For a bathroom or a smaller room there is the electric heating mat: laid in the tile adhesive under the tiles, with no pipes and no boiler room, and run by a Velt Wi-Fi thermostat.

How much power you need is worked out by the sizing guide and the heat pump calculator, from your town’s winter and summer.