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ThermaHeat RV Holding Tank or Step Heater Pad w/ Thermostat - 18-1/4" Long x 12" Wide

ThermaHeat RV Holding Tank or Step Heater Pad w/ Thermostat - 18-1/4" Long x 12" Wide

Item # 277-000164
Our Price: $45.64
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RV Fresh Water
Shipping Weight: 0.7 lbs
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RV Fresh Water 277-000164 - Holding Tank Heating Pad - LaSalle Bristol
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Full-contact, weatherproof heating pad helps prevent your RV holding tank or step from freezing. Built-in thermostat automatically turns the heating pad on and off depending on the temperature of the tank or step. Easy, peel-and-stick installation. Great Prices for the best rv fresh water from LaSalle Bristol. ThermaHeat RV Holding Tank or Step Heater Pad w/ Thermostat - 18-1/4" Long x 12" Wide part number 277-000164 can be ordered online at or call 1-800-940-8924 for expert service.
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LaSalle Bristol RV Fresh Water - 277-000164

  • Winterization
  • Holding Tank Heating Pad
  • LaSalle Bristol

Full-contact, weatherproof heating pad helps prevent your RV holding tank or step from freezing. Built-in thermostat automatically turns the heating pad on and off depending on the temperature of the tank or step. Easy, peel-and-stick installation.


  • Full-contact heater pad keeps your exposed RV holding tank or step warm during freezing temperatures
    • Works with tanks with a 29- to 40-gallon capacity
    • Can also thaw out a tank system or a step if it's already frozen
  • Built-in thermostat automatically operates the heater pad
    • Turns on when the tank or step temperature reaches 45 degrees F
    • Turns off when the tank or step temperature reaches 67 degrees F
  • Flexible, weatherproof carbon fiber material bends to fit the contours of a surface
  • Easy, peel-and-stick installation onto the bottom of your tank or step
  • 2-Wire design with 16-gauge wires
    • White wire is for ground
    • Red wire is for power
  • Compatible with DC power when in transit
    • Runs through a converter while connected to a power source when your RV is parked
  • Cold room tested down to -32 degrees F
  • QAI certified


  • Pad dimensions: 18-1/4" long x 12" wide
  • Pad thickness: 3 mm
  • Length of wires: 36"
  • Input voltage: 13.5V DC
  • Power draw: 4.8 amps
  • Wattage: 65 watts
  • 1-Year warranty

The Therma Heat RV tank and step heating pad meets the following certification standards:

  • Safety for Electric Heating Appliances, UL499
  • Safety for Heating Elements (CSA) C22.2 No. 72-m1984 (R2004)
  • Flammability tests (UL) 746C, 15 and CSA 0.17,9,2
  • Dieletric Voltage Withstand Test (UL) - 1000 volts/1 minute
  • Thermal Aging Test (UL)

Note: This heater pad should be installed on non-conductive surfaces only.

Why ThermaHeat?

When the outside temperature is cold enough, the exposed freshwater holding tank or step on your RV will freeze. For tanks, this stops the flow of water from reaching your sink, shower, or other freshwater source. Furthermore, the frozen water could potentially cause cracks or other irreparable damage to your tank or pipes, which would mean you would have to replace them. And a frozen step can be extremely slippery as you try to enter or exit your RV or camper.

The full-contact ThermaHeat heater pad will prevent this by keeping your holding tank or step warm during freezing temperatures. It has a built-in thermostat that automatically operates the pad. When the temperature of the tank or step drops to 45 degrees F, the pad will turn on. When the temperature rises to 67 degrees F, the pad will turn off. It can also completely thaw out a tank or a step if it's already frozen, assuming that none of the components have been damaged. The heater pad does all the work for you, preventing you from having to go out in the cold and thaw it out by hand with a heat gun or hair dryer, which can melt the side of your tank or step if not used properly.

Installation and Wiring

ThermaHeat Peel-and-Stock Installation

This heater pad has easy, peel-and-stick installation onto the bottom of your tank or step. The flexible carbon fiber material is designed to fit the contours of any surface. The pad is meant for use on fresh water tanks, but can be installed onto gray water or black water tanks. Please note, however, that adding a heat source to a gray water or black water tank may create excess gasses and odors.

ThermaHeat 2-Wire Design

The pad has a white wire for ground, and a red wire for power. This 2-wire design is compatible with DC power while your RV is in transit. It can also run through a converter while connected to a power source when your RV is parked.

Additionally, you are able to install this pad with other ThermaHeat heater pads (sold separately). In order to do this, they must be connected and run parallel. You would daisy-chain the red wires together and connect them to the battery of your RV or camper and then daisy-chain the white wires together and ground them. In order to turn the pads on and off, you will need to install a switch (sold separately) between the battery and the pads.

210SLT1218RTBX Therma Heat Heating Pad with Thermostat for Motor Home Water Tanks and Steps - 18-1/4" Long x 12" Wide

Alternate part number: 85851 and ST-T1218

Customer Satisfaction Score:

Customer Reviews

ThermaHeat RV Holding Tank or Step Heater Pad w/ Thermostat - 18-1/4" Long x 12" Wide - 277-000164

Average Customer Rating:  4.6 out of 5 stars   (87 Customer Reviews)

Full-contact, weatherproof heating pad helps prevent your RV holding tank or step from freezing. Built-in thermostat automatically turns the heating pad on and off depending on the temperature of the tank or step. Easy, peel-and-stick installation.


Holding tank heater pad sort of mounted, but as of now, have had no need to use.


1 year later, still solidly adhered to the bottom of the plastic freshwater tank.


Heater pad was delivered in excellent condition. Mounting it to my 30 gallon, exposed gray tank was simple. The adhesive is very strong and aggressive, so be careful with initial placement. Of course as always, I thoroughly cleaned the surface prior to mounting. I always use 91% isopropyl alcohol with a lint-free rag in such projects. Wiring was straight-forward, and it is quite effective at least to the 17-22F low temperatures I have experienced.



After one year installed, and being in 20F several nights, my tanks have never froze. I am very satisfied with my purchase.


I am very pleased with these tank heaters and the excellent customer service provided by etrailer! I installed one on each of my 3 tanks...fresh water, gray water, and black water. Easy peel-and-stick installation! Then I routed the wires thru split loom wire sleeves and secured with zip ties. I'm ready for freezing weather now.


looks great. It will be a few months before I can hook them up.


Completely surprised I got the order the next day. The only "Scary" thing was in my shipping address was to show " My Name" c/o Company name, so it would get to me. It was fortunate the receiver opened the box and "Guessed" who ordered this item. I tried to use your website to initiate this order but your website hung up while filling in the shipping address form, initiating me to call the order in. Thank you for having it in stock and shipping it so quickly. I'll have it installed before the next cold snap early next week.



This product is still functioning and keeps my tanks from freezing in cold weather conditions.


The decision is still to be determined. The last 2 were a disaster. Without being used, the pads came apart with the rubber separating from the coils. What a mess in cleaning the tanks of the old pads


Easy install and fast delivery, etrailer is great. Link to my Youtube channel for an install video -

Darrin J.


Still working great, I never froze last winter and I live in northern Colorado.


I bought these as part of a underbelly overhaul. Went on with out a problem. Ambient Temps are below 60...I have skirting and propane construction heater under TT keeping things warm for tonight.
Time will tell, so far so good.



Last yr we skamped aka ski camp with running water at 13°f. So far so good.


Excellent company to deal with


Install 3 holding take heaters, 1 fresh water tank heater and 5 elbow/ pluming heaters on my trailer. All of the heaters running at the same time draws less than 300 watts so I can now leave then on when towing without having to run my propane heater in the trailer. I added R30 insulation to my underbelly and took a trip to Angel Fire NM where one night it got down to -24 degrees F. None of my tanks froze. I had one temperature probes directly on my black water tank and it was 53 degrees with the -24 outside. Every day was below freezing with temps in the lower teens each night. I believe these are rated at -11 but it is a good idea to have an enclosed underbelly to keep the rest of your pluming warm.


Well, ordering had a hiccup, will not ship to P.O. Box. Figured a solution so away it came. Did hot shipping on Friday got it on Tuesday ??
Product was exactly as described but after comparing to tanks, they really need to be longer in my opinion to cover more surface area. Had a guy install directly to a 20 amp breaker which appeared to be a simple wiring task which I’m not up to doing but was fairly quickly accomplished by tech. Pads heated up immediately but the low amps makes it a slow process in heating. 3 tanks were partially frozen but as of today, Sunday the 17th I was able to discharge all tanks sufficiently enough to go a few days. I’m in bowman Nd with conditions currently-17. I 100% recommend these heating pads. Just don’t expect a complete warming or thawing to occur in under 48 hrs under my conditions. I’ll provide pictures of after install at a later date , it’s cold and windy and I’m inside for the day


went on very easy. tanks aren't flat these are very sticky and should hold up time will tell cold weather here shortly


Installed on a Coachmen Prism 2150LE. The unit did not come with tank heaters, but found to be prewired for them. Added a switch, connected the power wire in the fuse box, installed the new tank heater pads and appears to be working great.


Original order was received defective. Customer service and technical support was very responsive. It appears etrailer's customer service is handled in house and not farmed out to another country. A new item was delivered immediately. I was pleasantly surprised there are still companies that value customer service.


I ordered three electric tank heater pads. The price was great. The delivery quick. I will be ordering more from etrailer. The tank heaters will permit me to take my Chalet camper on ski trips and we will be able to have hot water and showers.


Received two holding tank heating pads today for my rv. I installed without problem in just a few minutes, motorhome was pre-wired. Less than $80 dollars invested. Bid for the work from a local rv dealer was over $1000!



Tank was well fitted to the job with the only problem being a persistent leak at the junction of the full hose to the tank. I applied some plumber putty to limit the leak to some degree.


I liked the price of the product. It was very easy to attach to the water tank. I am hooking it up now. I plan on buying more later on to use on other areas. I use my trailer during late year hunts and want running water. The low wattage/ amp use is low.


Reasonable price, delivery on time, product as advertised. Installation was a breeze, thanks to written instructions right on the product. Adhesive seems very durable, make sure you align the product exactly where you want it before application. 5 stars.


Purchased for emergency use, like when my water heater failed. My water heater has not failed yet while traveling but this water heater does work for small amounts of water demand.


Always great products and service. Etrailer is my go-to place for our RV parts.


Great customer care!! Will always purchase from etrailer.


Ordered this water tank warmer from the helpful staff at etrailer and it arrived a week later. Staff was very helpful in talking about the install as well. Best price from every where I looked.


Good product and quick delivery. Will solve cold weather issues in our trailer.

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