I live in Michigan and have tile on my kitchen floor on a cement slab. Even with an area rug the floor in the winter is so cold. I purchased this in January and used it the rest of the winter. It was great! It worked well and the floor under the rug was nice and toasty. I left it plugged in all the time and did not have any problems. I also purchased the rug mat that goes with it and have been very happy with both. They are now packed away waiting for next winter.

Electrician reassured the safety of this item so I finally execute my order. Theater room on back of garage was on concrete slab so by using this RugWarmer (60"x93") below rug (also carpet and carpet pad below), the room went from average 52' degrees to 72' degrees within 3 days. Now I'll research in using proper timer to minimize the rug warmer having to always be on.

This under rug heater changed my rv floor from a barely usable space in the cold to warm and livable. A rug gripper is required so have that on hand or order. Allow a 1" margin all around the 24" wide runner ( I purchased) . Tape is included with heater, to tape it to gripper pad. Your rug must overlap heater and gripper. The 170w doesn't trip the breaker like a space heater. Comfortable to stand on. 5 stars!!

Great for under a carpet next to sofa. We even enjoy it in Florida since our house sits on a concrete slab. Our cat loves it too and spends most of the winter curled up on it under our glass coffee table!! You need to purchase a carpet pad for it to work well but unfortunately they don't sell it with one and you have to try to match up the correct size.

I am writing this review as I noticed people finding it not feeling very warm in the questions. If you want it to hold the heat in its own footprint, you have to put a pad that will insulate it from the floor under it, then the rug on top of it. The rug pad has to be able to block the heat from transferring to the floor underneath, especially if the floor is made of a material that is a thermal sink, such as stone. When I bought mine over ten years ago, I ended up trying different materials for the rug pad, the denser and more insulating, the better. If you isolate it from the floor, the heat will stay in the footprint of the pad. I also used a plug thermostat with a clock in it- it was bought to be used in front of a couch in a south facing bow window, so in the winter during the day the area was cozy with thermal gain from the sun, but once the sun set it got chillier than the rest of the house. So I set the clock for it to go on from early evening until bedtime if the temperature dropped below a set number in that spot- so it only went on when it needed to. You could tell it was on as the rug was warm within minutes.