There are some pilot projects in the UK that are providing heat to homes via a district heating system, usually the heat is generated by a heat pump system.
Heat pumps can still produce high temperatures, this is achieved by using a multi stage system. Essentially, heating the water up twice, with the second loop using a different refrigerant optimised for higher temperatures. Such systems are usually uneconomical for homes, but are perfect for large industrial plants. These plants usually supply heat at a cost metered by a heat meter. Hot water can be supplied at any desired temperature by using a heat exchanger.
I was listening to a report on the BBC regarding one particular system that had replaced oil boilers in about 500 homes in a smaller rural town. The cost per unit of heat was identical. In one particular vox pop, the woman said she preferred her old oil based system, but when questioned further, could not explain why. At the end of the day, it's heat, so why would it matter? In her mind she'd rather have to maintain an old oil boiler and order in oil every year (at considerable expense and subject to wild swings in the oil price) compared to just receiving heat at exactly the same cost. Some people confuse me.