It really depends on how long you want to run the genny. I have some rental properties where the water is very hard. Don't plan to install a water softerner. The water heater would lime up and burn out the elements in a year or two. So I installed a new 30 gallon, 3500w electric and only wired it to 110 v instead of 220.
Cut the voltage in half, cut the current in half and the element is only getting 1/4 the power, 875 watts. Well, I can't remember the last time I replace a heating element. Tenants don't mind either. Guess they would if there were many people living there, but only one or two. BYW, it will take 4 times longer to heat the water.
So, lets say your 50 gallon is 5500 watts at 220v. You could, in theory, use a 5500w genny. Most would recommend going larger if you want the genny to last. Or you could use only 110v and have 1/4 of 5500 watts = 1375 w. I think you can replace the 5500 watts with 4500 or even 3500 watts.
So you decide what you want to do. I would decide on using the genny I have, however, producing electricity with gasoline is very expensive.
I'm going to guess someone will tell me that I can't use 110v on a 220v water heater, I've been doing it for over 20 years.
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Today's Featured Article - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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