You don’t need anything that complicated I’m thinking something like this. It already exists btw https://cleantechnica.com/2021/11/29/120-volt-heat-pump-water-

You don’t need anything that complicated I’m thinking something like this. It already exists btw https://cleantechnica.com/2021/11/29/120-volt-heat-pump-water-heaters-hit-the-market-make-gas-replacements-even-easier/amp/ https://cleantechnica.com/2021/11/29/120-volt-heat-pump-wate...