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Hot Water Recirculation Pumps - How Do They Work? Posted by Joe [Email] ![]() ![]() |
Talking about the kind you install at a sink, usually the furthest from the water heater. My parents have one, it's great, when I saw a new one at a garage sale for $5 I jumped on it. Works great, almost instant hot water. I'm really curious though if anyone knows how they work - I think when it turns on (thermostatically controlled, also on a timer) it feeds water from the hot supply into the cold supply until the hot side hit 95 degrees. What happens on the cold side? Is it just pressuring the entire cold side? It seems like it wouldn't circulate on the cold side because it's a closed pressurized system. Really curious how this works..it's keeping me up at night! Thanks for any input. I've Googled this until I'm blue in the face and all I can get is how to hook them up and the fact that they work but not how.
->Posting last edited on Wed, 18 May 2016 20:23:08.
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