Thread Tools Display Modes
Old 12-07-2013, 04:08 PM   #1
Junior Member
Join Date: Dec 2013
Location: Keller, TX
Posts: 6
Suburban SW12DE Water Heater

Our fifth wheel has the SW12DE water heater and it only heats the water to luke warm. I have tried it both on propane and on electric and the results are the same. I spoke to the dealer as to whether or not there was a temperature control on the water heater and they said no. Any recommendations on what to check or set in order to make the water hot coming out of the water heater?

Tom & Tracey
2013 Cardinal 3850 RL
2013 F250 King Ranch
tnoonan50 is offline   Reply With Quote
Old 12-07-2013, 04:17 PM   #2
Senior Member
fonzie's Avatar
Join Date: Sep 2010
Location: Eastern Ontario
Posts: 2,795
Check your water heater winter by-pass valve to make sure it is closed. Another possibility is your inside/outside shower that could have both hot/cold water faucets open but the shower head stop button closed. Water heater valves shown in summer position, by-pass is middle one.
Attached Images

2011 Rockwood 8319SS with ProPride 3P hitch/GoodYear Marathons/TST TPMS 507
2008 F250 Lariat CC SB 6.8L V10 4.10 axle ratio (NITTO TERRA GRAPLER G2 LT275/65R20E)
Yamaha 3000iseb generator:Progressive Ind. EMS-HW30C : Eastern Ontario
Nights Camped: 2011(21) 2012(36) 2013 (17) 2014 (18) 2015 (18) 2016 (36)
fonzie is online now   Reply With Quote
Old 12-07-2013, 05:03 PM   #3
Site Team
wmtire's Avatar
Join Date: Nov 2010
Location: Northeast Louisiana
Posts: 11,014
As Fonzie stated, it does sound like you have cold water mixing in on the hot water. I would check the things that he suggested, as they all will allow this situation to happen.

The easiest way to see if the water inside the heater is hot, is to go outside and open the access panel to the water heater. Slowly pull up on the pressure relief valve (shown in pic) to open it up enough for water to flow out... and then you can feel the water coming directly from the heater, to ascertain how hot it is. If it's properly hot here, then you know you must have cold mixing in downline in the bypass valves being set incorrectly (very common), or either/both of the indoor/outdoor shower valves open, but handheld wands shut Fonzie pointed out.

Hope this helps you isolate the problem, and please let us know what you find.
2011 Flagstaff 831 RLBSS

I used to be addicted to time travel, but that's all in the past now.
wmtire is online now   Reply With Quote
Old 12-07-2013, 05:48 PM   #4
Senior Member
Witch Doctor's Avatar
Join Date: Feb 2012
Location: Clarksville Va.
Posts: 6,820
You might try and reset both limits at the unit. They just press against the tank on the outside of the tank. Make sure they are making good contact against the metal of the tank.they are both located behind the black rubber box. I think the left is electric and the right is the gas.
Rockwood #8289 WS 2012
F250 6.0 / Husky 16k
With 4 point leveling system
Witch Doctor is offline   Reply With Quote
Old 12-08-2013, 09:40 AM   #5
Junior Member
Join Date: Dec 2013
Location: Keller, TX
Posts: 6
Thank you Fonzie and Wmtire. I first checked the outdoor shower valves and they were actually on even though the actual shower head was off. I checked the hot water this morning and it is hot. This solved the issue.

THANK YOU VERY MUCH!!! Anyone know anything about the Intervac System?
Tom & Tracey
2013 Cardinal 3850 RL
2013 F250 King Ranch
tnoonan50 is offline   Reply With Quote

heater, suburban, water, water heater

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

» Virginia Campgrounds

Reviews provided by is not in any way associated with Forest River, Inc. or its associated RV manufacturing divisions.

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 12:14 PM.