GordonThree wrote:
Miles, How about something like this?
Pump was less than $20 from Jeff's website, the shark-bite fittings cost more than the pump actually. Cutting the pex did make me wince on the first cut, but the world didn't end, and it all went back together without leaking. If you use shark-bite make sure your cut ends are perfectly straight, not at an angle or they won't seat and seal correctly.
Profdant, watch out that hot water doesn't soften that vinyl tubing so much that it slips off the fittings. I believe that clear stuff is only rated for 75F, don't know if it leaches chemicals into hot water, or just the softening thing.
That will circulate hot water into the cold water lines, but the OP's problem is the outlet hose from the fresh water tank to the pump froze. He wants to heat the fresh water tank, itself, to keep that from happening. This won't put any heat in the fresh water tank or the hose from it to the pump so it does not address his original problem.
Great hot water recirculation system though. I may do that to keep hot water at the kitchen sink.
