When we bought our house we had a heat pump water heater installed. The nominal tank water temperature is 80°C, and it mixes it to the desired temperature on ou

When we bought our house we had a heat pump water heater installed. The nominal tank water temperature is 80°C, and it mixes it to the desired temperature on output. It can also circulate water in a heat exchanger to keep your bath water from going luke-warm while you're in the bath. We don't have solar but we do have a solar energy plan from our power company, so power during solar hours is charged at 0.5x rate in trade for the solar during the duck curve hours being 2x. So we have the hot water heater set to only heat during the solar hours and A/C set to shut off during duck curve hours. This has resulted in our electricity costs for our house being lower than the combined electricity+gas costs for the apartment we lived in before (which was much smaller).