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I am not a professional plumber, although , have been exposed to a fair amount of plumbing work. I did plumb my house, but, certainly do not claim to be an expert! I have a Buderas Boiler with a logomatic control. Previous summers , after home heating season, I have heated my domestic hot water with an indirect off my boiler. I use about 250 gals of oil per summer for this purpose. I have solar panels on my roof. In an effort to move some hot water expense to electric, I have purchased an electric heat pump hot water heater. I am finding the heat pump electric heater cannot handle my demands affordably. I was considering letting the heat pump unit act as a "preheat" tank feeding the indirect 110 - 115 degree water instead of 47 degree well water. Will this save any appreciable amount off the 250 gals of fuel oil consumption. Since my boiler would still be my source , I assume it will still have to maintain temperature, thus burning oil. The question is ...will "topping off" the heat of the already hot water reduce the boiler fuel consumption?