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- Jan 9, 2017
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I hear what you are saying. In thinking about it, I don't think it would make any significant impact. Here's why. The size of the heat exchanger is small and the amount of latent heat is small for the size of my tank systems (600 gallons). My gas bill is only a few dollars more per month. Does that make sense?Just an idea, your tankless is getting the heat exchanger hot, your water is flowing through till the tank reaches the correct temp and stopping, leaving a lot of residual heat in the exchanger. I am thinking that you can set up your apex to have the heater circulator pump shut off 1st, your tank circulator pump continue to run longer to suck out any remaining heat.