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Thread: Dometic 2021 Hot Water Heater Drain Cap Mod.

  1. #1
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    Dometic 2021 Hot Water Heater Drain Cap Mod.

    The new Dometic hot water heaters have a confounded drain CAP, not a plug like the old ones. Mine was dripping with just water in the tank, once it was heater, it forced water past it. When I took it off to drain the water heater, it was deformed from the heat.

    Anyhow, the first picture is of the confounded cap. The following ones are the 1/4 turn brass valve I put on it. I bought the valve at Lowes.

    The drain pipe is aluminum, and I'm aware the aluminum and brass have a metallurgic reaction to one another. PVC wasn't an option due to the heat. So, I wrapped the drain pipe with a ton of teflon tape, then put plumbers pipe dope on that, the screwed the drain on.

    I did have to remove the manifold to get it on, so there is that.

    The blue did on the drain plug is the pipe dope. It didn't work.Click image for larger version. 

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    Mark & Mary. Currently hailing from New Mexico. Hopefully full timing in late 2022.
    Current camper: Purchased a 2021 DG Reflection 320MKS!
    Current Rig: 2019 Ford F350 SD Crew Cab, w/8' box, Lariat, SRW, 6.7l Diesel

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    No zinc anode in the drain point?
    2018 Chev Silverado 3500 HD diesel
    2021 Solitude 380FL

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    Quote Originally Posted by Max Owner View Post
    No zinc anode in the drain point?
    Nope. Not even a mention of one in the manual either.

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    Mark & Mary. Currently hailing from New Mexico. Hopefully full timing in late 2022.
    Current camper: Purchased a 2021 DG Reflection 320MKS!
    Current Rig: 2019 Ford F350 SD Crew Cab, w/8' box, Lariat, SRW, 6.7l Diesel

  4. #4
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    I couldnít find a compact ball valve like yours at Menards so the one below is on its way from Amazon. I might be able to remove the handle to install it. Itís brass like yours, but plated. Iím not too concerned with dissimilar metals on the outside of the unit (metallurgist here btw). The lack of an anode is a bigger deal long term, but thatís just the way it is.

    Click image for larger version. 

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  5. #5
    Site Sponsor BC315RLTS's Avatar
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    Quote Originally Posted by Max Owner View Post
    No zinc anode in the drain point?
    Dometic/Atwood water heaters have an aluminum tank so no need for the anode rod.
    2019 Reflection 315RLTS
    2019 Ford F250 Lariat SuperCab PSD SRW

    Former set up:
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    2017 Ford F150 Platinum

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    All my trailers have had the anode. Never paid much attention to the brand of them to know any better.
    2018 Chev Silverado 3500 HD diesel
    2021 Solitude 380FL

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