Yes, it costs more then the air tap, but the air tap is a retrofit kit, this is a whole water heater, the air tap has an efficientcy of around 2.2 times greater then a simple heating element at 55F and this Stiebel Eltron is 3.2 time more efficient then a heating element, it also has a better warranty, heats a 80 gallon tank instead of a 50 and is made by a company that normally makes solar hot water equipment.
I'm going to wait 6 months to a year to get something like this, partly to see what else comes out as I think this is going to be the next wave in water heating.
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