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Thread: Water hammer
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02-14-2021, 07:36 AM #11
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There will be some air at the top of the water heater, but that doesn't stop water from "boiling" when the pressure is reduced by opening a faucet. I don't think it's water hammer here, from what @Hobo Bill is describing.
RobU.S. Army Retired
2012 F350 DRW CC LB Lariat PS 6.7
2020 Solitude 310GK-R, MORryde IS, disc brakes,
Sailun LRG tires, solar, DP windows, W/D
(Previously in a Reflection 337RLS)
Full time since 08/2015
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02-14-2021, 08:46 AM #12Hobo Bill
From Cuyahoga Falls, Ohio
Traveling Full Time Across the US
2019 Reflection 5th Wheel 337RLS
2007 Dodge Ram 3500 DRW Cummins 6.7 Turbo Diesel
Goodrich T/A KO2 All Terrain Tires
Reese RP30081 20K
[SIGPIC][/SIGPIC]
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02-14-2021, 09:07 AM #13
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U.S. Army Retired
2012 F350 DRW CC LB Lariat PS 6.7
2020 Solitude 310GK-R, MORryde IS, disc brakes,
Sailun LRG tires, solar, DP windows, W/D
(Previously in a Reflection 337RLS)
Full time since 08/2015
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02-14-2021, 09:17 AM #14
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You have had some good responses here. I don’t know what the clunking could be but here are a couple of thoughts.
My experience from living in a fifth wheel for the last eight years is that after the water heater finishes heating there will be a higher pressure in the water system and the first faucet, hot or cold, opened will surge for a second or so. I have lived in two different rigs and both had the after heater shut off surge so I suspect it is normal. It becomes obvious when dry camping and only turn the water heater on for showers. I always figured the water in the water heater expanded and increases the pressure in the system causing the temporary surge of water. This may be related to your noise.
As someone else pointed out the rv water heaters have and need an air pocket in the top of the tank to work correctly. The water heater manual for my 2020 heater has a procedure for re-establishing the air pocket at the top of the heater. Check your manual. It goes something like, cool the heater off, turn off water, open a faucet, then open the pressure relief valve to let the heater suck in air. I do this on mine to keep the heater from weeping or dripping from the pressure relief valve.
If re-establishing the air bubble in the heater does not fix the noise then you need to take out the back basement wall and try to get it to make the noise while you are down there. You might have a piece of PEX knocking against something.
I think water heaters in RVs probably make all kinds of strange noises. In my old trailer the water heater would pop and groan, squeal and make all kinds of strange sounds.Last edited by Always Learning; 02-14-2021 at 12:59 PM.
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