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Everyone - thanks for the replies, and the help - I appreciate it! An update: I have fixed the problem, and the system is now working fine. The pump is running continuously, circulating the water and keeping the loop hot. Like I said before that I was going to do, I swapped the positions of...

Thanks Bannerman, I am going to hack it with a hack saw... Was just a play on words really. My plan, as I said earlier, is to swap the positions of the pump and the check valve. The check valve should be on the discharge side of the pump. Unfortunately, if I put the check valve in the cold...

Here's a picture of what it looks like now. Before I hack it... Line on the right is the cold water supply going down to the water heater on the right. Left side is the recirculation return line. The one across at the top is supplying an outside hose bib. The regulator and the accumulation...

Guys, thanks for your replies. Well, like I have already said - this is not a "controlled" pump - it doesn't have temperature sensors, temperature settings, or a motor controller that is adjustable - it is a 100% on all the time motor. But it still starts up, runs for a couple of seconds and...

hj - the pump is in-line and is between the return line and the cold water supply to the heater. There are two plastic valves; one on the incoming return line, and one on the tap into the T to the cold water supply. They put the check valve on the upstream side of the pump, just after the return...

I looked at the installation a bit closer. Shouldn't the check valve be on the output (discharge, or pressure) side of the pump? Like in the drawing you provided Terry (thanks for the reply). This one is about a foot above the pump on the suction side, not in between the pump and the water...

I just moved into my new house, where I got a looped hot water recirculation system installed. I had asked the plumber if he was installing a pump that would sense the water temperature and run as needed, and he said "Yes, it has a built-in temperature sensor, but they usually run all the time"...