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I am Yu

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Posted: 01/11/21 11:36am Link  |  Quote  |  Print  |  Notify Moderator

I'm running on internal water (not city water). I don't leave the water heater turned on all the time (too wasteful to do so) and when I turn it on it raises the pressure in the whole plumbing system way too high, and I get water leaking from the toilet onto the bathroom floor. The only way I've found to deal with this is to shut off the pump and briefly open a faucet every 10 minutes to relieve the pressure, until the heater gets hot and the pressure stabilizes, which gets pretty annoying.

There is a pressure relief valve on the water heater, but apparently it's only intended to protect the heater tank, and opens at too high a pressure to do anything for the plastic plumbing.

Is there some kind of relief valve that opens at a lower pressure, which I could install somewhere in the system and have it drain overboard?

2oldman

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Posted: 01/11/21 11:50am Link  |  Quote  |  Print  |  Notify Moderator

I have the same issue. I turn off the pump and leave a HW tap open. When the tap starts to drip I turn off the heater.

Sjm9911

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Posted: 01/11/21 11:59am Link  |  Quote  |  Print  |  Notify Moderator

Intresting problum, maybe try to turn down the tempature of the water heater. Less heat , less expansion , less pressure, maybe.....just an idea.


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Boon Docker

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Posted: 01/11/21 12:40pm Link  |  Quote  |  Print  |  Notify Moderator

Sounds like a faulty check valve on the cold water line at the water heater.

Dusty R

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Posted: 01/11/21 01:17pm Link  |  Quote  |  Print  |  Notify Moderator

I like installing a small bladder type pressure tank. It makes the whole water system work nicer.

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Posted: 01/11/21 01:37pm Link  |  Quote  |  Print  |  Notify Moderator

Drain the water heater and refill it, that will re-establish the air pocket in the tank and allow for expansion. See your water heater owners manual for more information.





schlep1967

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Posted: 01/11/21 01:41pm Link  |  Quote  |  Print  |  Notify Moderator

Lynnmor wrote:

Drain the water heater and refill it, that will re-establish the air pocket in the tank and allow for expansion. See your water heater owners manual for more information.


Or just turn off the pump and drain a small amount out. Then turn the pump back on without using 6-10 gallons of water.


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time2roll

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Posted: 01/11/21 02:15pm Link  |  Quote  |  Print  |  Notify Moderator

A small accumulator will solve the issue. Yes I had the same problem.

Amazon - Shurflo 181-201 Accumulator Tank $38

This creates a permanent air pocket.

Mine was in the RV shop twice for several weeks for a mystery water leak. Never found. I had to dig for this myself while camping. I guess the dealer did not think to cycle the water heater to find a leak.

* This post was edited 01/12/21 11:14am by time2roll *


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4x4van

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Posted: 01/11/21 02:42pm Link  |  Quote  |  Print  |  Notify Moderator

Lynnmor wrote:

Drain the water heater and refill it, that will re-establish the air pocket in the tank and allow for expansion. See your water heater owners manual for more information.

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Posted: 01/11/21 02:55pm Link  |  Quote  |  Print  |  Notify Moderator

schlep1967 wrote:

Lynnmor wrote:

Drain the water heater and refill it, that will re-establish the air pocket in the tank and allow for expansion. See your water heater owners manual for more information.


Or just turn off the pump and drain a small amount out. Then turn the pump back on without using 6-10 gallons of water.


I didn't want to get onto it, but since the air dissolved into the water tells me that draining and flushing is way overdue.

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