There are new 120v heat pump hot water heaters that operate in this way: https://cleantechnica.com/2021/11/29/120-volt-heat-pump-water-heaters-hit-the-market-m

There are new 120v heat pump hot water heaters that operate in this way: https://cleantechnica.com/2021/11/29/120-volt-heat-pump-water-heaters-hit-the-market-make-gas-replacements-even-easier/ https://cleantechnica.com/2021/11/29/120-volt-heat-pump-wate... "120 volt heat pump water heaters come with a mixing valve integrated into the water heater itself. This mixing valve allows owners to keep their water at a higher temperature and as the water leaves the tank, the valve will mix “in the exact amount of cold water needed to ensure the water comes out of the water heater at the correct temperature.”