Just scored a NIB AirTap A7, under Heat MIzer name, from Ebay for $250. So I will be going HP route when I install. Though it won't have all the integrated controls for hybrid running as new one unit HP DHWHs I'm sure a wiring connection can be DIYed to allow a seasonal switch to even just winter off-peak elec(when basement can be overcooled) I'm ahead and can have summer savings, cooling and dehumidification as wanted. Also can add A7 to the 80gl min tank size needed for the off-peak elec program here. Still plan to have a recycled pre tank with which to experiment on other water heating source for fun and savings. Also will work on ways to free heat basement air to keep A7 working efficient as much as possible(ground tubes, solar, air supplied wood stove). I'm not trying to reach zero net just get as close as possible for reasonable cost.
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