Does anyone have experience of adding a "pre- warming" system to a tankless hot water unit to reduce cost/ increase efficiency?
I'm in a northern climate, house is small, one bathroom with a 3"high enclosed crawlspace. The crawlspace is normally around 60-70 degrees, the water from the street comes in at around 40 degrees in the winter. My best choice (convenience, no need for venting, install price, space) of an electric tankless efficiency is impacted by the temp of the incoming water. I'm thinking of adding a crawlspace tank prior to the tankless unit to allow the incoming water temp to warm up for "free" in the crawlspace- thinking that a tank of about 40 gallons or 100 ' of pex in the warm crawlspace would warm up several degrees on its own and help reduce my electric /water bills. Anyone tried this?
Posted Wed, 12/04/2013 - 22:44
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