Mirror Defoggers: Get your Bathroom Mirror Defogger from WarmlyYours TODAY

Features & Specifications

Easy Installation Self-adhesive backing allows for quick and easy installation on any wall-hung mirror.

Energy Efficient Designed with one of the highest efficiency ratings in the category, helping to reduce overall heating costs.

Safe & Certified Runs on standard 120VAC and is cULus listed for proven safety and performance in bathroom environments—just not inside the shower.

Consistent Heat Regulated surface temperature of 104°F (40°C) ensures clear reflections without overheating.

Slim Design Ultra-thin profile at just 0.02″, with a self-adhesive backing for fast and secure installation on any wall-hung mirror.

Fast Shipping & Easy Returns Same-day shipping available nationwide, with no restocking fees on unused products.

1-Year Warranty Backed by a manufacturer warranty covering defects in materials and workmanship.

24/7 Installation Support Access expert assistance any time—day or night, all year round.

Standard Mirror defoggers - Shop by Shape

Circular

Available Sizes

15 in. x 15 in.
20 in. x 20 in.
25 in. x 25 in.

Shop Circular Defoggers

Oval

Available Sizes

18 in. x 26 in.
24 in. x 32 in.

Shop Oval Defoggers

Rectangle

Available Sizes

12 in. x 18 in.
18 in. x 24 in.
24 in. x 32 in.
30 in. x 40 in.

Shop Rectangle Defoggers

Custom Mirror Defoggers - Made to Fit Your Unique Mirrors

For mirrors that don’t conform to standard dimensions or shapes, WarmlyYours offers custom-sized mirror defoggers. Custom units can be crafted for both 120V and 240V systems in rectangular, circular, or oval shapes.

Rectangular models can be designed up to 47.25” x 59” for 120V and up to 47.25” x 78.75” for 240V.
Circular models can reach up to 47.25” in diameter.
Oval sizes can be up to 47.25” x 59”.

How to Install a Mirror Defogger

Installation is straightforward, typically involving connection to your bathroom’s existing lighting circuit so the defogger activates with your lights. While the process is manageable, it’s recommended to have a licensed professional perform the installation to ensure adherence to the National Electric Code. WarmlyYours provides 24/7 technical support to assist with any installation questions or concerns.

Mirror Defogger Customer Reviews

Rated 4.8/5

We take pride in providing both exceptional service and great electric radiant heating products. But don't just take our word for it, check out what some of our customers have had to say.

The mirror warmer works great, was easy to install, and the buying process was flawless!

WarmlyYours is very proactive with communication and their website is clear and well laid out. Very pleased with my purchase.

Thomas L. in Torrance, CA

Easy to install, and works well.

I was easily able to install the self-adhesive heating elements on the back of a very large mirror and wire them into the bathroom's ceiling fan circuit which I have put on a timer. I tested the glass temperature with an infrared thermometer and it heats up quickly (in my case, to around 28C from a starting temperature of around 20C) and is very effective at keeping the mirror completely fog free during long hot showers. It's a nice luxury to have.

Julian B. in Ottawa, ON

Mirror Heaters work great

I bought three custom-size heaters to avoid fogging in the bathroom mirrors, had them installed and they all work flawlessly. Customer service is fantastic and, despite challenging delivery instructions, WarmlyYours delivered.

Eduardo H. in Mexico City,

Mirror Heating Element

The mirror heating elements work very well, they were easy to order, easy to wire and install and we think they are great. I'd seen these in some upper end hotels in Europe so when we built our house I had to have them. The ordering and shipping from WarmlyYours went very smooth - it was a good experience.

Donald S. in Newton, KS

More Customer Reviews

Mirror Defogger Frequently Asked Questions

Do radiant heating products have polarity?

Electric-resistance heating cables and systems have no polarity. This includes all current WarmlyYours heating elements.

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Can I use multiple defoggers on the same mirror?

Yes, but please make sure not to overlap multiple heating elements over each other.

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How does a mirror defogger work?

An ultra thin electric heating mat is attached to the back of the mirror, which transmits gentle warmth across a mirror’s surface to prevent moisture from condensing on the mirror's surface during a shower or bath.

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Can I wire it to the lighting circuit?

Yes. In fact, this is the most common way to operate a mirror defogger.

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What is the length of the cold lead for a mirror defogger?

A mirror defogger cold lead is 36 inches long.

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Can you attach it to the back of a medicine cabinet door?

No. Mirror defoggers are designed to be mounted and wired to a fixed, wall-mounted mirror.

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If the defogger is smaller than the mirror, how far into the excess of mirror will this defog?

The defogging is concentrated in the area of the heating element, but may spread out as the mirror warms up over time. There are too many variable atmospheric conditions that make it impossible to quote a fixed distance of heat spread away from the element. That is why the defogger must be placed in the area of the mirror that requires defogging.

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How quickly can a mirror defogger defog a mirror?

The mirror defogger will begin to defog the mirror within 5 minutes of operation.

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What is the best way to keep bathroom mirrors from fogging up?

Installing a heating system behind your mirror is the most reliable way to avoid a foggy mirror. Typically, mirrors fog up because they are much cooler than the steam in a bathroom after a shower or bath. The cool surface of the mirror causes the moisture in the steam to condensate in the form of fog. A heated mirror will prevent this condensation by being as warm, or warmer, than the steam.

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Can a mirror defogger be controlled with a low-voltage dimmer switch?

The mirror defoggers are not designed for use with dimmer switches or with any low-voltage control.

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Can I trim the mirror defogger?

No. Mirror defoggers can't be trimmed and the proper size needs to be selected to fit on an open, unobstructed area on the back of the mirror.

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How do I glue a mirror to the wall and still have a defogger on it?

If you're gluing a mirror to a wall, simply apply adhesive to the mirror backing, not covered with the mirror defogger.

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Can I put a mirror defogger in my shower?

No. Mirror defoggers are not rated to be installed in wet locations like a shower enclosure.

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How thick is the box on the back of the heating mat? Does it prevent the mirror from lying flat or flush against the wall?

The electrical junction box should be installed inline with the Mirror Defogger’s lead wires and box. The box at the back of the defogger is meant to be located over the electrical box in the wall. This way it will be in the electrical box and not interfere with the defogger being flush with the mirror and the wall. The location where the wires leave must be entirely within the area of the new electrical junction box.

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