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There are a few problems with your plan. Thermal Conductivity First off. If you're going to make a heat exchanger, you should use copper instead of PEX. Copper has a thermal conductivity of 401 watts/meter kelvin (W/mK), while PEX is closer to 0.51. Volume The next problem, is the volume of water you're preheating. 1" PEX has an inside diameter (I.D.) ...


Did you insulate your pipes beyond the water heater so that they are not losing the heat rise per foot? The hotter they stay before appliance the less demand for rise on the heater. Make sure you tape all the seams. Also do a tune on your heater -- often with both on boil and forced style heaters the efficiency and heat rise are below spec. I've seen ...

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