Posted by Chris Jones on February 21, 2015 at 16:54:38 from (65.188.217.236):
In Reply to: frozen pipes posted by Northvale - PA on February 21, 2015 at 16:02:36:
It occurred to me that you could use an instant hot water recirculating pump to solve the problem and also provide you with hot water at the faucet w/o the wait for it to make it's way from the heater through the pipes.
My parents installed such a unit. A pump is put in the hot water heater outlet line. A temperature sensitive valve is then installed under the sink in the supply lines. That valve allows water to flow from the hot water supply line under the sink to the cold water supply line (hence back to the heater) whenever the water temp in the hot water line drops too much. The reason of course is so when you turn on the hot water faucet the line is already full of hot water.
The unintended benefits in your case is the hot water line will never freeze and as warm water is run frequently into the cold water line going back to the water heater that line should never freeze either.
You can put valves under any and all sinks you want instant hot water at or just the farthest sink and at least hot water is closer to all the sinks that way as the main run is kept hot.
The downside is the water heater has to run more to keep those lines full of hot water now too. Also the cold water line might be slightly warm. To save energy their pump has a timer on it so it can be set to run all the time or only certain times of the day when they would want instant hot water available.
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