I believe(my opinion) the first water heater to be released will be the point-of-use. My guess is it will only handle 1.5 maybe 2 gpm, need 120 volt, 30 amp circuit and pull roughly 20-25 amps to operate. Efficiency will be 99%. Size of the unit will be about 6" x 10" with 1/2" fittings to hook to existing water supply.