Jeff Homan
New Member
Hello all. I'm looking for some troubleshooting advice on our house we recently moved into. I have a two tank hot water parallel system with gravity fed recirculation loops. The gravity recirculation has two loops that tee together into the drain of one of the tanks. The two loops cover two "sides" of the house. The tee is about 10-15' linear from the drain with no insulation on that section. I do not see any check valves in these loops.
On the south side of the house with the kitchen and laundry, I have two kitchen type faucets that have single handle blending fixtures plus a powder room and bar with standard two handle faucets and the wash machine feeds. The system functions as expected for hot water. However, when I open a faucet for full cold on the south side, it will run hot for 20-30 seconds. My theory is the gravity feed is pulling the cold through the blending fixtures. Not sure if it matters, but we have a well with a pressure tank.
I don't seem to have the same issue on the North side even though those bathrooms have two shower faucets with single handle blending type faucets.
If the blending faucets are the issue, is there some sort of check valve I could install at the faucet connection to prevent the back feed? Or should I install a check on the cold side by the hot water tank. I don't have a horizontal plumbing exposed by the faucets so I may need to plumb a loop in the cabinet if needed. The hot water tanks and a lot of the plumbing is exposed in the basement and crawl space.
Thanks,
Jeff
On the south side of the house with the kitchen and laundry, I have two kitchen type faucets that have single handle blending fixtures plus a powder room and bar with standard two handle faucets and the wash machine feeds. The system functions as expected for hot water. However, when I open a faucet for full cold on the south side, it will run hot for 20-30 seconds. My theory is the gravity feed is pulling the cold through the blending fixtures. Not sure if it matters, but we have a well with a pressure tank.
I don't seem to have the same issue on the North side even though those bathrooms have two shower faucets with single handle blending type faucets.
If the blending faucets are the issue, is there some sort of check valve I could install at the faucet connection to prevent the back feed? Or should I install a check on the cold side by the hot water tank. I don't have a horizontal plumbing exposed by the faucets so I may need to plumb a loop in the cabinet if needed. The hot water tanks and a lot of the plumbing is exposed in the basement and crawl space.
Thanks,
Jeff