Some have an Motoraid heater in the hot water heater, Do you have engine jacket water lines to the water heater?
But again, if it is a "hot" water heater, you should not need to heat the water farther.
Ken
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Amateur Radio Operator (KE5DFR)|No Longer Full-Time! - 2023 Cougar 22MLS toted by 2022 F150, 3.5L EcoBoost Tow Max FX4 Lariat Travel with one Standard Schnauzer and one small Timneh African Gray Parrot, retired mechanical engineer
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