7-1/4" x 25" RV Tank Heater Pad with Automatic Thermostat - 2Packs, RV Water Tank Heating Pads, Prevents Freezing for Fresh, Grey, Black Water Tanks up to 50 Gallons, QAI Certified

Perfect, just what I needed.

I ordered these (2) heating pads after watching a Youtube video regarding keeping LiFePo batteries above freezing, as this is required of these batteries. I bought 2 of these heading pads, and have installed 1 of them directly to the side of my 4x100Ah battery bank (using the adhesive backing to attach them directly to the sides of the battery. Even though the pads come with a thermostat that turns them on when temps dip below 40F, I installed the pads through a temperature controlled relay (https://www.amazon.com/dp/B09531FDPN?psc=1&ref=ppx_yo2ov_dt_b_product_details). So far, the temperature within my RV has dipped below 20 degrees, and the batteries have remained at about 38 degrees. The heating pad is drawing about 70 watts when it is activated. If the 1 heating pad is not enough to keep the bank above freezing, I will connect the 2nd pad to the opposite side of the battery bank (then will draw 140 watts). Trying to avoid running down my battery bank, in the process of keeping it alive. So far, the heating pads have worked well. I hope to give another followup in the Spring.

I ordered the two pad set of 7x25” pads. Before installing I checked that the thermistors turned on and off. However, after installing, one pad didn’t heat at all, verified by zero current draw, and the other pad’s wattage fluctuated wildly between zero and c. 65 watts, and did not provide any appreciable heat. I’m swapping both pads out for another set to see if my luck improves, but am not looking forward to scraping the old ones off, and finding a baggie to put the bits and pieces in so that they can be returned as per Amazon’s request. Update: before returning the heater pads, I heard that it’s possible to remove the embedded thermostats, and connect the wires, so that the thermostat is totally bypassed. This I did, and now, with an external controller, the pads work perfectly, drawing 65 W each.

Shipped to the UK. Perfect for my Camper Van grey water tank for in the winter months. I got two so I always have a spare.

Heaters worked great, prepped area with running alcohol, and then applied the adhesive. Draw exactly their rated current and switch on and off appropriately. Used on 3- 25gallon tanks and 2-38gallon tanks. No freezing so far down to 20 degrees. Wires seem to be good quality, appeared to be pure copper and not copper clad aluminum (CCA) which is greatly appreciated in this application. Just seem a bit more expensive. Would like to see them come down 5-10$

A bit expensive (for me, anyway), but I don't think it's unreasonably so. Can't tell quite yet if the temp control functions as it ought to, but I'm not too concerned. I did fuse it and I did put an on/off switch in the circuit because I'm using it for an off-label use: as a battery warmer for a standalone solar project. (Right after I ordered this I saw a YT video on Will Prowse's channel where he discussed this very use.) Anyway, I already have the smaller version in another project (lithium battery-powered, remote weather station) and it works great. Bottom line, consider this item. 5 stars.

Wired them up and 1 pad works and pad does not. The one that works feels warm. The one that doesn't work has no heat. Both wired off 1 switch to come on together. So I had to use my heat gun to drain my shower this morning. Had do deice the gate drain. I can't peel it off to return it since Its super glued on now. (Adhesive is STRONG) 2 star since both don't work. Next time I think I'll try the 12x18 pad instead

One heater was DOA, the other works perfectly. The one that doesn't work was attached to my black tank, so it's VERY important that it works. I also confirmed that voltage was reaching the heater pad, so it's definitely the pad itself. Fortunately, I noticed before I absolutely needed it to function. Unfortunately, it was slightly after the return window because that's when the outside temperature started getting below freezing. Filing for a return/replacement was pretty convoluted, but I managed to get a refund by contacting Amazon (not the seller or manufacturer as is stated in a few places). I also have to return the faulty heater, which is probably going to end up in pieces due to the quality adhesive they use. Replacing the faulty heater apparently isn't an option, and there's no reasonable way to contact the manufacturer to even figure out what the warranty is. They don't have a website or any other contact info, just a blurb saying that you can have the warranty info MAILED to you if you send a self-addressed, stamped envelope. Ridiculous. SO make sure you test the heater BEFORE attaching it. Once it's attached to the tank, you won't know if it works until you need it to work. Just connect it to a battery and stick it in the freezer or something to make sure it turns on.

Essy to install. Great adhesive! Won't know how well they actually work until winter camping.

I bought two in November. I installed them in my RV under the batteries (lifep04, not lead acid or anything else caustic). They worked fine for 3 weeks, but now one has failed. It switches on for a second every 10 seconds and then switches off. Its -8 in the battery bay, so they should be on solid. I suspect the temperature sensor is bad, and I can smell a "burnt electrics" odor. I'm just glad not to have had a fire. wcn Addendum: I removed the batteries and found that the rear pad had melted under them and nearly caused a fire. I would say not safe to use anywhyer but external metal tanks which are never empty. This could have burned my RV or damaged thousands of dollars of batteries.

Rated low as I purchased two pads. After the installation and sticking the pads to the tanks, I have found only one works, the other is faulty. Since it is stuck on and cannot be removed, it was a waste of money. I will now need to try figure out next steps. Suggest you test the operation before you Install, a bit difficult as they are thermostat controlled and you have to cool them down to get them to operate.

I bought 3. 1 doesn't work at all and 1 overheats. Only 1 seems to actually turn on and off as it should.

I tested this pad on my workbench by placing it in my freezer for a few minutes to engage the thermostat, then powering it on while hooked up to my amp meter. It was drawing just over 4 amps which would be about 55 watts of power and not the stated 78 watts. When I removed the pad from the freezer it soon became coated with condensation. The moisture quickly evaporated on the heated portion of the pad, revealing the zigzag pattern of the heating elements underneath. However, about 20% of the pad did not appear to be heated at all. The condensation remained there after the rest was dry and the thermostat cut power. This unheated part was the part furthest from the wire connection. It's possible that the cold 20% of the pad got disconnected from the rest through damage or manufacturing defect. That would explain the low power reading from the amp meter.