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Open Roads Forum  >  Do It Yourself Modifications and Upgrades (DIY)

 > TT underbelly heating alternative compared to UltraHeat

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Posted: 10/29/11 12:52pm Link  |  Print  |  Notify Moderator

An electrically heated trailer underbelly alternative. Here’s my idea. Purchase 120V Electric “3 ft. x 29 ft. Slab Heating Mat Warmly Yours WSHM-120-03029” ($649.57), tile floor underlayment heating pad.
3 ft x 29 ft slab heating mat

UltraHeat option cost.
My TT has 4 tanks, 2 gray, 1 black, 1 fresh h2o:
UltraHeat 40 gal tank pads approx. price:
13.5vdc – approx. $160
120v – approx. $175
Dual voltage – approx. $190
Pipe heaters of various sizes – approx. $70
Elbow heaters – approx. $50
Switch pak – approx. $100

Total approx. cost using UltraHeat option:
4 tanks 12v approx. price - $1320
4 tanks 120v approx. price - $1380
4 tanks dual voltage approx. price - $1440

Slab heating mat option:
So my thinking is to run the “slab heating mat” down the length of the trailer under belly, backed by the suppliers “Cork Underlayment Sheet Warmly Yours CORK-SH6MM-2436” in 36” x 24” sections. I would need 15 of them. Approx. cost $80.
Cork underlayment

You can even add a “Circuit Check Warmly Yours SS-01” approx. $10.50 to ensure there are no shorts in the slab mat.
Circuit check

A controller for dual voltage - Dual Voltage Power Module Warmly Yours CT230-GA. Approx. cost $110.
Dual voltage controller

Total cost for slab heating mat w/ cork underlayment approx. $850.00. This installment would provide a full length of trailer heating source that would generate warmth by convection and conduction and radiation to keep the entire underbelly of the trailer warm/prevent freezing and eliminate the need to run gas heater.

Another option from this same company would be the foil “Electric Environ II 2 ft x 10 ft Radiant Floor Heating Panel Warmly Yours 210-10-240” at approx. $176 per sheet. This option would require 6 sections with approx. cost of $1056. Total cost approx. $1250.
Foil heating pad

Rumor has it that tank heaters that are adhesively attached to the tank will eventually fall free and fail to operate as designed.

Retired Navy Saturation Diver
2011 230RKS Wind River - Outdoors RV
2011 F-350 Crew Cab 6.7L Diesel Short Box
Longview, WA



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Joined: 09/08/2010

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Posted: 10/29/11 08:45pm Link  |  Print  |  Notify Moderator

all that plus the cost of electric seems pricey...



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Joined: 03/20/2012

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Posted: 04/16/12 11:34am Link  |  Print  |  Notify Moderator

gktsuda did this system with the mat work?


Portland, Oregon

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Joined: 06/22/2005

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Posted: 04/16/12 01:34pm Link  |  Print  |  Notify Moderator

my heat vents are between the tanks and my underbelly is "sealed". I just used a hole saw to cut a 1/2" dia hole in the vents and dump some warm air into the underbelly. Keeps the underbelly as warm as the TT, no extra cost, works when boondocking.

2011 Keystone Outback 295RE
2004 14' bikehauler with full living quarters
2015.5 Denali 4x4 CC/SB Duramax/Allison
2004.5 Silverado 4x4 CC/SB Duramax/Allison passed on to our Son!


Southern California

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Posted: 10/29/11 09:11pm Link  |  Print  |  Notify Moderator

I did four tanks. UltraHeat parts about $550, another $104 for 120v heat tape for waste pipes, ~$100 for various wire and supplies so maybe $750/$800. Self install.

Also check ebay for low cost items.

My UH pads are holding onto the fully exposed tanks just fine after 3 years.

2001 F150 SuperCrew
2006 Keystone Springdale 249FWBHLS
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