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10-02-2015, 01:37 PM
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#1
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Senior Member
Join Date: Mar 2013
Location: Manning
Posts: 376
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Water Heater Plug
I have followed the forum for 6 or so years and have seen all kinds of problems addressing W/H malfunctions. I don't remember seeing one of this nature. My W/H Atwood 6 gal DSI blew the head off the drain plug today. The threads are still intact in the W/H drain line. The W/H is Jun 2008 vintage and has been removed and re-tighten quit a few times over the years. The water has seemed to be very hot lately, i.e, will burn your hand hot. Wonder if that could have had a impact on the incident. Would not the pressure relief valve popped before enough pressure built to blow the head off the drain plug? Don't see any way to adjust the thermostat. Called Atwood Tech Services. They were very friendly and tried to be helpful. They suggested using a small saw to weaken the threads in a couple of places and try to collapse them and also maybe glue a dowl rod inside and try to back the threads out.
Anyone have any experience along this line?
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10-02-2015, 01:42 PM
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#2
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Site Team
Join Date: Nov 2010
Location: Virginia`s Eastern Shore
Posts: 17,093
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I`m with you, that is a new one on me too. You should be able to get that out though with a bit of patience.
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10-02-2015, 02:06 PM
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#3
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Senior Member
Join Date: Jul 2015
Location: Tucson
Posts: 969
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I have a pipe plug extractor and a tool that is tapered and fluted like the pipe extractor I bought at an irrigation store. Suggest you spray P B.Penetrant and then try to remove. The pressure relief valve needs to be exercised at least once a year that will not make it last longer it it only tells you it can open.Antidotally I can't count how many pressure relief valves have failed upon test or within the next few days of being opened.
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10-02-2015, 02:10 PM
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#4
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Senior Member
Join Date: May 2012
Location: Minnesota
Posts: 9,783
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I have not seen it before on a TT, but have seen similar issues in other applications. what are you using for a plug? Standard plastic or have you upgraded to another plug, such as PVC, brass or something else?
I would assume you were using the standard OEM plastic plug that came with the WH. I replaced mine after a number of times of use, as the threads appeared to be weakening, and I could see the head twisting. I suspect you over torqued the plug a few times and the plastic fatigued and weekend below the pressure relief set point. I have brass , some say do not use brass. But I spoke with the metallurgist at work, and he said in this application it was just fine.
As for removing the threads; if you can get in there I would try one of the following; a left handed drill bit (hard to find) a bit larger than the plug opening size, a left handed tap, or a tool called an "Easy-Out". The Easy-Out would be the best option, and fairly cheap. All three should be able to grip the plastic plug housing and un thread it.
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10-02-2015, 02:17 PM
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#5
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Senior Member
Join Date: Mar 2015
Location: Abingdon
Posts: 6,177
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My opinion is, get rid of that plastic plug and buy a expandable neoprene plug. They last longer and work fantastic! Shaw plugs.. Turn-Tite makes them.
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10-02-2015, 02:19 PM
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#6
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Senior Member
Join Date: Mar 2015
Location: Abingdon
Posts: 6,177
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And to get the old plug out, use a damaged screw remover. Available at Lowes, Home Depot, Etc..
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10-02-2015, 02:52 PM
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#7
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Senior Member
Join Date: Jun 2011
Location: San Jacinto, Calif
Posts: 459
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Quote:
Originally Posted by TWP723
My opinion is, get rid of that plastic plug and buy a expandable neoprene plug. They last longer and work fantastic! Shaw plugs.. Turn-Tite makes them.
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Do you have a part number or plug size?
Thanks in advance
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10-02-2015, 04:50 PM
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#8
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Senior Member
Join Date: Dec 2010
Posts: 1,645
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Those nylon plugs do wear out. I used one too long and tightened it too much and the head came off. To get the remaining plug out, I used a hacksaw very carefully - remember the metal threads in the tank are aluminum - and sawed several slots, or almost slots, in the plastic threads. I used a small screwdriver to push the plastic threads in, and made a deformed area in the remaining plastic threads I could grab onto with a pair of needle nosed pliers and twisted and pulled the remaining plastic threads out. There was a slight roughening of the aluminum threads in the water heater tank; I carefully screwed a steel 1/2" pipe nipple into the tank drain outlet and that straightened up the threads. This repair is not hard, it takes longer to explain than to do. But do be careful with the hacksaw!
I learned not to use a nylon plug too long; when the cap of the plug gets close to the tank, replace the plug.
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10-02-2015, 05:13 PM
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#9
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Senior Member
Join Date: Feb 2012
Posts: 968
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This is a double post.
It also appears under Travel Trailers with several more responses.
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10-02-2015, 05:54 PM
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#10
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Site Team
Join Date: Jan 2011
Location: James Island, SC
Posts: 22,859
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I had one blow out on a Atwood years ago. I did the same thing rvhiker did. Cut it down to just before the threads, pulled it out with a small screwdriver and needle nose pliers
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10-02-2015, 07:32 PM
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#11
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Senior Member
Join Date: Feb 2015
Location: Eagle River, AK
Posts: 900
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Echoing what has been said, you should be able to get the threads out and a new plug and all is well. As for the water being to hot consider this:
Atwood Water Heater Adjustable Electronic Thermostat 93105 - $28...
They are relatively easy to install.
Then finally consider this installing something like this. Makes draining easy and less trouble with taking a plug in and out.
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10-02-2015, 07:41 PM
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#12
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Senior Member
Join Date: Nov 2014
Location: Florien, LA
Posts: 1,872
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I got pretty much what's in that picture just a little different and utilizing a pex stop valve. Makes draining very easy which we do every trip.
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10-02-2015, 11:19 PM
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#13
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Senior Member
Join Date: Mar 2013
Location: Central
Posts: 219
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Quote:
Originally Posted by NVGun40
Then finally consider this installing something like this. Makes draining easy and less trouble with taking a plug in and out.
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Is that just a rubber hose clamped over the plastic cap? And if so, does it seal ok?
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10-03-2015, 06:00 AM
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#14
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Senior Member
Join Date: Mar 2015
Location: Abingdon
Posts: 6,177
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Quote:
Originally Posted by joe in calif
Do you have a part number or plug size?
Thanks in advance
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Not sure of the part number. I picked mine up at Lowes. They expand to fill the hole. Easier to install and remove than the plastic plug..in my opinion. I think maybe 5/8" - 3/4"???..Not sure...
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10-03-2015, 06:28 AM
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#15
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Senior Member
Join Date: Nov 2012
Location: Athens
Posts: 803
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You should never replace the plastic plug with a brass or metal one. That plug did exactly what it was suppose to do. If your relief valve fails that plastic plug is the secondary back up made to fail. Never put a metal plug in place. I have seen a hot water heater where the tank failed due to this, lucky no one got hurt . But the water in the camper , not good.
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10-03-2015, 07:08 AM
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#16
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Senior Member
Join Date: Mar 2013
Location: Central
Posts: 219
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Quote:
Originally Posted by Donedroolin
You should never replace the plastic plug with a brass or metal one. That plug did exactly what it was suppose to do. If your relief valve fails that plastic plug is the secondary back up made to fail. Never put a metal plug in place. I have seen a hot water heater where the tank failed due to this, lucky no one got hurt . But the water in the camper , not good.
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I never thought of that. Good point!
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10-03-2015, 07:10 AM
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#17
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Senior Member
Join Date: Jun 2015
Location: Valparaiso
Posts: 141
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Question for NVGun40...where did you find the parts to do that? Really like the idea...
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10-03-2015, 07:14 AM
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#18
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Senior Member
Join Date: Nov 2014
Location: Florien, LA
Posts: 1,872
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Mine is a nylon / plastic type bushing in the WH. Then a npt X barb fitting in that. Sink type hose, then pex crimped to the barb and pex stop valve. All parts at lowes.
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10-03-2015, 07:20 AM
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#19
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Senior Member
Join Date: Nov 2014
Location: Florien, LA
Posts: 1,872
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Npt X npt nipple, sink hose then pex valve. No crimps. Think I did it like in the previous post last time.
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10-03-2015, 07:21 AM
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#20
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Senior Member
Join Date: Nov 2014
Location: Florien, LA
Posts: 1,872
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Here's the WH side
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