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Old 09-01-2015, 07:43 AM   #1
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High water pressure when water heater is first turned on?

I have been getting a burst of water pressure when I have turned the water heater on for hot water when ready to shower. This is on gas. It also does it on electric. When I go to the faucet and turn it on there is a burst of high pressure. Could the water heater pressure Valve be bad? Not to long ago I blew the bottom out of my water filter housing. Luckily I was in the camper when it happened...if it is the pressure valve how hard is that to change? I have a 2013 Forest River Flagstaff suburban water heater.


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Old 09-01-2015, 08:00 AM   #2
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Most RV or home supply stores sale pressure reducer that attach to your supply hose also the burst of high pressure from hot water is due to the fact hot water expands therefore increasing pressure.
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Old 09-01-2015, 08:15 AM   #3
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My water lines were tested at 90PSI, so I have not stayed at any park that has that high of pressure requiring a regulator. The hot water in your tank will expand and produce a but of pressure when you first turn it on. once it is relieved it should be good. As for your water canister getting blown off, if it is the FR1 with the KW1 filter there a a few known issues with these such as putting in the wrong filter or no filter at all then you tighten it too much when you do this and it breaks off the locking tabs that keep it on there.
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Old 09-01-2015, 08:32 AM   #4
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Water line pressure

No none of those I have no issues there. I have a presure regulator and the canister was ok. I am getting a burst of presure, not continual presure and only happens when water is being heated. I do not think the how water presure relief valve on heater is working properly. The hot water heater will leak a small amount on outside of camper at times
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Old 09-01-2015, 09:00 AM   #5
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If you think it is bAd, replace it.
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Old 09-01-2015, 09:04 AM   #6
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If the Temp/Pressure valve is leaking a little when the water is heated I would look more towards the temperature control first. Have you checked the water temperature after the heater is done cycling?
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Old 09-01-2015, 09:22 AM   #7
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Once the water is past the pressure relief valve into the trailer it is locked there. The water is cold. You turn your hot water heater on. As the water heats it expands increasing the line pressure. It will not go backwards out of the trailer to relieve excess pressure. You do have a safety relief valve on your hot water heater that is supposed to release high excessive pressure during the heating process. Try operating it manually a few times and make sure it is not plugged or seized. You may have to replace it.
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Old 09-01-2015, 09:35 AM   #8
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Quote:
Originally Posted by fordsuperdutyE350 View Post
No none of those I have no issues there. I have a presure regulator and the canister was ok. I am getting a burst of presure, not continual presure and only happens when water is being heated. I do not think the how water presure relief valve on heater is working properly. The hot water heater will leak a small amount on outside of camper at times
Have you tried to restablish the air cushion in the water heater? Block water service to the RV, carefully bleed off water level using the heater tank relief valve until it stops flowing. Release valve handle. Now you'll have an air space for heated water to occupy without driving up pressure.
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Old 09-01-2015, 09:41 AM   #9
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Originally Posted by Filthy Beast View Post
If the Temp/Pressure valve is leaking a little when the water is heated I would look more towards the temperature control first. Have you checked the water temperature after the heater is done cycling?
X2 If you are water heater is leaking at times that would indicate the pressure relief valve is working. You may have a faulty temp sensor and may be letting the water get too hot.
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Old 09-01-2015, 09:56 AM   #10
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Originally Posted by VinceU View Post
Have you tried to restablish the air cushion in the water heater? Block water service to the RV, carefully bleed off water level using the heater tank relief valve until it stops flowing. Release valve handle. Now you'll have an air space for heated water to occupy without driving up pressure.
X2 for VincwU, you need an air cushion
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