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I have a Marathon/Rheem 85 gallon electric water heater. It's one of the lifetime warranty/plastic tanks and is tied into my geo unit.
I'm not certain it's the way I'd go again. The energy efficiency is great and there are benefits to the setup, but I have 1 issue.
With this unit for example in the evenings, the kids take baths/showers and say use 30 gallons of water. If I go to shower an hour later, or fill a bubble tub, the water is luke warm, not hot. My guess what happens is you take 85 gallon tank of hot water, refill it with 30-40 gallons of cold water and it takes the electric too long to heat it back up.
I've considered adding a 2nd heater in series, where the main use was from the geo, but refilled from the 2nd unit so it was essentially 85+40/50 gallons of hot water.
If on-demand was more efficient I think I'd have looked alot harder at that. As it was, geo required the larger tank anyway and I thought this would save me money in the long run.
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