Ditto, I went with the 22kW for my house.Good info. With over 100 tanks, I decided on a different avenue to cope with power losses. I installed a Generac 15kW automatic natural gas backup generator. I liked it so much that I also installed a 12kW system on the house.
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how long will 2 heater last one a 1500va ups? the heater is 300watt each.