I installed them myself. I never had any problem with warranty issues with Aquastar. I did have a problem with one unit, that Aquastar promptly sent me parts for with out any questions. As far as the length of warranty it may be 12 years I do not know. But I believe that it will be much greater than that given the fact there is nothing to them. The tank is the biggest thing to fail on regular heaters and with no tank, not much else to go wrong.
As far as NG vs LPG, you must specify when purchasing the unit. I have had both with no difference in performance.
As far as electric, I have used point of use under a sink, but as I said in my first post I have not found a whole house unit that is electric or even one that could be used for a shower here in the states. There is just not enough current (voltage) available on a line here in the states to heat the water flow that would be required for a whole house or shower unit. If someone finds one let me know. But I just do not think it would be very energy efficient.
Bottom lined with me and these units. They sit quietly by while not in use and when needed give unlimited supply of hot water. I believe in them and believe if anything should be law these should. And I do not like the government being involved in anything.
A house I built years ago did not have hot water running to the sinks. I had point of use electric units for the sinks and the Aquastar for the showers, and washer. The dish washer heated it's own water. I cut down on water waste by having instant hot at the sinks and energy by having Aquastar heaters in the house. Again good luck and I think it is well worth looking into.
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