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On demand and tankless do not go together in a sentence.
Inorder for you to have hot water a couple of seconds after you turn on the water, readily available hot water must be near by near by. I mean, within 3to 5 feet. The pump acts as if you were using water but it returns back into the line and recirc. itself. It can be done, but it involves a lot more piping then just screwing in a pump under the sink. I have a recirc on a timer and a thermo. switch hooked up to a tankless heater. That recirc. pump has to be large enough to push water through the tankless unit because it requires a certain volume of water going through it to turn it on to produce hot water.
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