Quote:
Originally Posted by JamieGeek
I've seen home systems that just pump the hot water back down the cold water lines.
Like this one (Home Depot). They just send the hot water back down the cold water pipe--no need to run another line. You could put something like that under the bathroom sink.
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It works residentially because that recirculation pump is stronger than the house pressure. In the RV it's the one pump. You need to add a return line back to the tank or into the intake (vacuum) side of the pump. Our "winterizing" port is teed before the pump (to push the juice thru) and I'll interrupt that with another tee from the mi$er.
On high end homes, a 3rd pipe is run back to the heater for a full house "instant hot recirculation. There's a YouTube video , the guy's name is Kuhl, where he installs a solenoid at the galley and runs a return back to the tank. That works well when all the plumbing is on one side, but would be a bear with the galley on one side and the shower on the other.