I expect it will rank with highest efficiencies out there for heating water with the added bene of not wasting energy by storing water in a tank or in a large distribution system's piping. Water is wasted too, since we often turn on shower a couple mins ahead to warm up the water. No need with tankless, instant on heater technology.
We'll see. My biggest problem with WDRP is what is business model? Can Robert manufacture heater for a cost that supports a good profit? That is yet to be known.
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