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02-23-2022, 08:01 PM
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#1
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Member
Join Date: Feb 2020
Location: Mahtomedi
Posts: 54
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Changing hot water check valve question
I have a 6 gallon Dometic/Atwood hot water heater. Electric and Gas. Thinking about changing check valve. Currently has plastic check valve which is causing some water flow problems when water is hot. Will use a brass check valve. Read about brass and aluminum tank aren't compatible over time. Has anyone had any experience or thoughts on whether this is a problem or not with using a brass check valve?
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02-23-2022, 08:56 PM
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#2
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Senior Member
Join Date: Jul 2016
Location: Mapleton
Posts: 4,583
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You might ask by phone or email what the manufacturer recommends as a replacement. If they ok brass then why not.
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02-24-2022, 05:11 AM
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#3
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Senior Member
Join Date: Sep 2014
Location: In a house
Posts: 1,001
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I've always replaced the plastic drain plug with brass, so I'd think if you have a plastic check valve, that too would be fine using brass.
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2005 Jayco GreyHawk Class C
2007 Ford F150
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02-24-2022, 07:38 AM
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#4
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Senior Member
Join Date: Jun 2013
Location: McKean, PA
Posts: 1,099
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Brass and aluminum connected together shouldn't be a problem. The chart shows metal compatibility. If the intersecting square between the vertical listing of one metal to the other metal across the top is green, they are good to use together.
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2011 Skylark 21FKV
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02-24-2022, 08:40 AM
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#5
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Member
Join Date: Feb 2020
Location: Mahtomedi
Posts: 54
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A Big Thanks
Thanks for all the responses so quickly. What a wealth of information. Now I can make the right decision for my RV. Take care everybody and have a great day.
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02-24-2022, 12:30 PM
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#6
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Senior Member
Join Date: Jun 2013
Location: McKean, PA
Posts: 1,099
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If you look at your water heater, the safety valve is brass.....
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2011 Skylark 21FKV
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02-24-2022, 12:52 PM
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#7
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Senior Member
Join Date: Dec 2012
Location: Southern Indiana
Posts: 3,241
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Just curious but if you wrapped the threads of the brass check valve with teflon tape before installing it into the aluminum tank, would that help prevent any galvanic corrosion that may or may not occur? I'm thinking about doing this myself on my Atwood WH.
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02-24-2022, 06:22 PM
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#8
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Senior Member
Join Date: Jun 2013
Location: McKean, PA
Posts: 1,099
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Quote:
Originally Posted by TCNashville
Just curious but if you wrapped the threads of the brass check valve with teflon tape before installing it into the aluminum tank, would that help prevent any galvanic corrosion that may or may not occur? I'm thinking about doing this myself on my Atwood WH.
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It is unlikely that the teflon tape would prevent all contact between the brass and the aluminum. Bass and aluminum play well together in wet environments.
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2011 Skylark 21FKV
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02-25-2022, 05:02 AM
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#9
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Senior Member
Join Date: Sep 2014
Location: In a house
Posts: 1,001
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Quote:
Originally Posted by TCNashville
Just curious but if you wrapped the threads of the brass check valve with teflon tape before installing it into the aluminum tank, would that help prevent any galvanic corrosion that may or may not occur? I'm thinking about doing this myself on my Atwood WH.
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Teflon tape is recommended to prevent any leaks under pressure. I'm sure if you did not use it, you would have drips, no matter how tight you wrench down.
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2005 Jayco GreyHawk Class C
2007 Ford F150
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02-25-2022, 11:36 AM
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#10
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Senior Member
Join Date: Sep 2019
Location: Cambridge
Posts: 110
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Quote:
Originally Posted by us71na
If you look at your water heater, the safety valve is brass.....
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This isn't always the case. Our 2020 28.5rsts had a plastic one and because it had been over torqued was limiting the amount the valve would open and the flow of water. Replaced it with brass and not a problem after that.
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02-25-2022, 11:49 AM
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#11
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Senior Member
Join Date: Jun 2018
Location: VULCAN
Posts: 708
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Quote:
Originally Posted by mavrick0
This isn't always the case. Our 2020 28.5rsts had a plastic one and because it had been over torqued was limiting the amount the valve would open and the flow of water. Replaced it with brass and not a problem after that.
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Our 2022 28.5 RSTS water heater has a brass safety valve. I've never seen a plastic one on any of the trailers we've had, but this doesn't mean there aren't any, probably lots of things I've never seen.
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2019 Ram 2500 Cummins
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02-25-2022, 12:04 PM
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#12
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Senior Member
Join Date: Aug 2016
Location: newtown
Posts: 600
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The plastic plug is used for a blow off. The pressure will blow the plug out. I will keep my plastic plug. Every 2 or 3 times with a new plug.
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02-25-2022, 12:12 PM
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#13
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Senior Member
Join Date: Jun 2018
Location: VULCAN
Posts: 708
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Quote:
Originally Posted by campersam9
The plastic plug is used for a blow off. The pressure will blow the plug out. I will keep my plastic plug. Every 2 or 3 times with a new plug.
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Are you talking about the plastic drain plug, or something else?
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2019 Ram 2500 Cummins
2022 Jayco 28.5 RSTS
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02-26-2022, 12:17 PM
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#14
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Senior Member
Join Date: Sep 2019
Location: Cambridge
Posts: 110
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Quote:
Originally Posted by Yooper906
Our 2022 28.5 RSTS water heater has a brass safety valve. I've never seen a plastic one on any of the trailers we've had, but this doesn't mean there aren't any, probably lots of things I've never seen.
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I'm pretty sure we are talking about 2 different things. The OP was talking about the check/one way valve on the output of water heater that supplies water to the trailer.
The pressure relief valve located on the outside of the tank at the access door is for sure brass.
And I'm pretty sure what the other person is talking about with a plastic blow out plug is just the plastic drain plug. If that blows out before your pressure relief valve does it's job then you have bigger issues.
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02-26-2022, 12:19 PM
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#15
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Member
Join Date: Feb 2020
Location: Mahtomedi
Posts: 54
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I was talking about the one-way check valve for the output of the hot water heater. From a couple of the replies it seems that changing the plastic over to a brass one will work just fine. I think the chart that one person posted about the compatibility between metals is the best information about putting a brass check valve into an aluminum tank. Thanks for everybody's replies. Have a good day.
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03-02-2022, 01:12 PM
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#16
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Member
Join Date: Oct 2020
Location: Vineland
Posts: 94
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You can use PVC fittings between the tank and the check valve...
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03-02-2022, 01:17 PM
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#17
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Senior Member
Join Date: Mar 2019
Location: Hamilton
Posts: 341
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I'm just about to do this as well. Ordered 1 brass and 1 plastic, same as what's on the tank. Based on all the comments, I'm going to install the brass check valve with teflon tape and keep the black plastic one as a spare. My problem with the hot water flow, which completely stopped flowing at times, started the day after I changed the whole house filter. I'm thinking some crud went through the system after I changed the filter and interfered with the check valve. I'll see what's up when I pull the original valve.
Cheers
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03-02-2022, 01:53 PM
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#18
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Senior Member
Join Date: May 2019
Location: Salisbury
Posts: 110
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Quote:
Originally Posted by dlewand53
I have a 6 gallon Dometic/Atwood hot water heater. Electric and Gas. Thinking about changing check valve. Currently has plastic check valve which is causing some water flow problems when water is hot. Will use a brass check valve. Read about brass and aluminum tank aren't compatible over time. Has anyone had any experience or thoughts on whether this is a problem or not with using a brass check valve?
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If you're having issues, change it now. The plastic one will fail. I ended up having to disassemble my basement 7 days into a 2 week trip at a remote camping area as our failed without warning. And depending on your rig they can be a bear to access.
$60K RV and they use a 25c plastic piece of junk for a the check valve.
I still carry a spare. Murphy's Law?
Murphy was an optimist lol.
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03-03-2022, 05:12 AM
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#19
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Senior Member
Join Date: Sep 2014
Location: In a house
Posts: 1,001
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Quote:
Originally Posted by mavrick0
I'm pretty sure we are talking about 2 different things. The OP was talking about the check/one way valve on the output of water heater that supplies water to the trailer.
The pressure relief valve located on the outside of the tank at the access door is for sure brass.
And I'm pretty sure what the other person is talking about with a plastic blow out plug is just the plastic drain plug. If that blows out before your pressure relief valve does it's job then you have bigger issues.
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This.
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2005 Jayco GreyHawk Class C
2007 Ford F150
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03-03-2022, 09:53 AM
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#20
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Senior Member
Join Date: Jan 2020
Location: On the Road
Posts: 714
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I replaced my plastic one with a brass one 2 yrs ago, no problems and fixed the hot water pressure issue.
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