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i have a 22kw with auto transfer switch generac . best thing bar none for house and tank . don't ever have to worry about a powerloss again. it comes on automatically after it senses loss of power for 5 sec. then goes off after it senses power back on. don't ever have to touch. I do have a little piece that I got from amazon that I have plugged into bedroom socket that puts out a screeching alarm if power is interrupted that will wake me so I can just check on tank . then go back to sleep . very good piece of mind for me and worth every penny plus good selling point if ever decide to sell home