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Our water heater had the same symptoms as yours, so we installed the Isotherm unit 6 years ago. Connecting it to the engine is easy. We've never connected it to shore power. As mentioned above, limited motoring to an anchorage in the evening warms up the water enough to make it useful for a shower the next morning. The insulation matters. Even 12 hours later, I have to mix in warm water or it's too hot. While I can use marina facilities to shower, I prefer doing so before I leave the boat.
IRMV
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