Forum Title: Hot water taking way too long to reach fixtures
My plumber friends and I (a handyman) can't seem to solve this vexing problem. The house is an ordinary single story, maybe 20 feet from the WH to the closest fixture and 75 feet from the WH to the furthest fixture. When the Grundfos pump is running, we get hot water within 30 seconds. When we started working on this project, if the pump was not running, no fixtures *ever* got hot water. The pump was plumbed into the cold water line, so we switched it to return to the bottom of the water heater drain, and with a check valve. When the pump is on, all works the same as before, fine. And now when the pump is off, we *eventually* get hot water along the system, but we're talking like 5+ minutes to even the close fixtures. There's no way there is that much cold water between the WH and the first fixture (I did the math). When the hot water arrives, it's warm and only slowly turns to true hot. To me, it seems like cold is mixing in. Everyone disagrees with me, but how else could the water be so slow and then only warm for awhile?
Category: Plumber Post By: GLENN WHEELER (Lake Havasu City, AZ), 01/29/2016

is it piped like this drawing? have you verified, that the dip tube is in the cold hole of the heater ? that the check valve is pointed towards the heater? and is level if a swing ck? is water heater elec. or gas? if elec, ck lower element

- LEROY DEAN (Sparks, NV), 09/19/2017

To check if you have a cold crossing into the hot and diluting hot turn off the cold supply to the water heater. You should have NO water coming out of any hot water faucet. Moen single handle fixtures have been known to pass water through a valve even when in the closed position.

- DOLORES WONG (Buffalo Grove, IL), 10/05/2017

Thanks for the reply! Answers below: Quote: Originally Posted by frodo is it piped like this drawing? *** Yep! have you verified, that the dip tube is in the cold hole of the heater ? *** Is there anywhere else it could be going? The heater is a Bradford White, 1 year old. that the check valve is pointed towards the heater? and is level if a swing ck? *** Yes, it is. is water heater elec. or gas? *** Propane. if elec, ck lower element

- TONI YANG (Alexandria, LA), 10/09/2017

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