In my opinion, both the Marathon water heater and the heat pump water heater are bad ideas. Very few houses have these expensive water heaters. I would just replace your water heater with the inexpensive standard type that requires no maintenance, and will provide reliable hot water for 12 years or so. One major consideration is that, when you get in the shower and you have no hot water, what are you going to do? If you have the standard type water heater, you can call almost any plumber, and they will come to your house and install a new water heater the same day. Try calling a plumber and telling them that your heat pump water heater is not working. How long are you willing to wait without hot water while trying to find a plumber who can get the repair parts for an expensive water heater.
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