Message to Our Customers

SunTouch Floor Warming

Model # 423250B

Internet # 100661227

LoudMouth Installation Monitor for Underfloor Heating

This item has been discontinued.
The Home Depot no longer carries this specific product.

$24.84 /each



Model # 423250B

Internet # 100661227

Store SO SKU # 1000541396

The LoudMouth monitors SunTouch mat, wire, or Underfloor heating elements during the entire installation process and sounds an alarm if the heating elements are cut or damaged, allowing for easy repair before the heating elements are covered with finished flooring flooring or insulation. The LoudMouth gives you the assurance of a quality installation. Features include 9-volt battery power, on/off switch, green light to indication operation, red light to indicate damage to heating elements, test button to verify proper operation, and a very loud alarm. It's a must for every job.

California residents: see  Proposition 65 information


Product Width (in.) 
4 in 
Flooring Product Type 
Underfloor Heating 
Product Weight (lb.) 
1.75 lb 
Warranty / Certifications
Manufacturer Warranty 
1 Year Warranty 


Rated 4.9 out of 5 by 8 reviewers.
Rated 5.0 out of 5.0 by Worked great! The LoudMouth monitor worked great. It was easy to install, even came with a battery and a jewler's screwdriver. I would recommend it to anyone installing an electric radiant floor heating system . June 10, 2009
Rated 5.0 out of 5.0 by Valuable back up when laying the heat mat. Provided a back up when installing the heat mat. Not 100% necessary , but does give you a level of additional comfort. February 28, 2012
Rated 5.0 out of 5.0 by boss is loud mouth An must have for any heating pad installing made me feel safer when trowling the thin set over mat but let me give you contractors an bit of advice defenally use the plastic trowel well worth it and an peice of mind nowing that its no going to harm the mat when trowing the thin set January 28, 2014
Rated 5.0 out of 5.0 by This is really $25? Product did exactly what is was designed to do and my heated floor install went with out a hitch. I have no complaints. I do have to say when you have it open to install the battery you do wonder where the $25 went... May 2, 2011
Rated 5.0 out of 5.0 by Recommended for floor heating mat installation Worked as advertised; easy to connect up and use. Gives required peace of mind that everything gets installed properly. But a bit pricy. January 3, 2015
Rated 4.0 out of 5.0 by Decent Product We used this alarm as recommended, while installing heated floor mats underneath tile in a bathroom. It took us a little bit to figure out how to hook it up but we are not electricians and the instructions were not as clear as they could have been. Made us feel better to have it hooked up while installing the tile. December 15, 2013
Rated 5.0 out of 5.0 by excellent and essential product for installing radiant This product worked as promised, definitely an essential for installing a radiant floor heating system. January 24, 2014
Rated 5.0 out of 5.0 by One of a kind product This is a must for floor wiring installations where other crafts are involved in the porject August 12, 2014
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