Ok so from your response, you are planning to build bionic and above code requirements. Diy and separate (free/cheap) licensed inspector. Great. Now pick your price point and power sources.
Cheap from China ain't the same as industry standard or commercial bionic made by union labor. Not just the tankless or tiny tank heater, but all the parts that make it do it as well.
All we really need is your design heat load and flow rate and target dT with respect to the supply side of the system.
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