Honeywell TH115-AF-GA/U Radiant Heating 120/240V Programmable Thermostat with Floor Sensor and GFCI
$103.95
Price: $99.00 - $103.95
(as of Sep 20, 2025 11:31:18 UTC – Details)
Honeywell,TH115-AF-GA ,120/240v 7Day DPST ElecHtStat. 7-day programmable line volt thermostat for elect.
Plastic
Imported
Brand: Honeywell
Product number: TH115-AF-GA
7-day programmable line volt thermostat for elect
Category: HVAC. Three choices of temperature control in a single thermostat (Ambient, Floor, or Ambient with Floor temperature limits). Application-Radiant floor
Customers say
Customers find the thermostat works well with heated mats and appreciate it as a replacement for NuHeat systems, noting it’s easy to install and program. The display quality receives mixed feedback, with several customers reporting issues with the GFCI circuitry not resetting. While some customers say it’s worth the price, others feel it’s not worth the cost. The thermostat’s lifespan is concerning, with multiple customers reporting failures within 15 months, and one noting it only lasts 6-7 years.
11 reviews for Honeywell TH115-AF-GA/U Radiant Heating 120/240V Programmable Thermostat with Floor Sensor and GFCI
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Bob Bexley –
Using it for under floor heating in bathroom.
Easy to set up and get running right out of the box. Bright easy to read display. If you are replacing an older model thermostat, check the sensor loop resistnce of your sensor wire with an ohm meter. Mine read 17 ohms. This new model comes with a sensor wire that measures 12 ohms. If that’s your case, and you decide to keep using your old sensor wire, you may need to up the temperature setting on this thermosat by a few degrees in order to compensate for the higher risistance in the sensor wire. I did that and it works fine.
Amazon Customer –
Works as it should.
If you are reading this, you should be pretty familiar with your options. This unit allows for floor sensing and the modes allow you to heat to a targeted floor temperature, targeted air temperature, or a targeted air temperature while controlling the min and max floor temps. It also allows separate schedules each day with 4 settings per day.Things to know about this (if they matter to you):* You can use either 120 or 240v, depending on how you wire it.* The included instructions do NOT agree with the markings on the unit itself. Input/Output are different in the instructions versus the unit itself. I don’t know if this is a typo or a translation problem. (I followed the unit markings and it seems to be working well.)* If you opt for a 24-hr (military/European style clock, you can only have CELSIUS temperatures. Otherwise you only get a 12-hr (AM/PM)/Fahrenheit display.* It does have a heat anticipator option if you want it either click on or off at a certain time or if you want it to decide when to turn on and off to reach the target temperature by a certain time.I like it and recommend it.
Geoff Mclean –
Great replacement
Stuffing all the wires into a conventional switch box is a challenge. Although I rated it as 4 stars for ease of use – it’s because you have so many choices in heating times. You must read the enclosed manual! I bought this as a replacement for a unit that kept complaining it was shorting out (GFCI kicked in). I was pretty sure that there was not an electrical problem – I took several readings of resistances and could find no underlying cause. I know it was a bit of a gamble – but ripping up the floor was an option of last resort. New one is installed and working fine. If you are not comfortable working on 120V electrical lines then get a reputable electrician to install it.
Lisa Ibrahim –
Don’t buy this from Amazon
We bought this product 17 months ago. I had reservations because I read that sometimes it fails after a year or so and I worried that returning or exchanging it would be an issue. I was right. This failed after 17 months. I tried to contact the 3rd party seller without success. I contacted Amazon support and they reminded me that I had purchased an extra warranty through Asurion. I contacted Asurion and they said the product was still under manufacturer warranty so I needed to contact Honeywell. Honeywell has TERRIBLE customer support. I was trying to deal with all of this on a Saturday so the warranty support department was closed. I called the customer support line from the website and they said the wait on hold would be “over and hour’. I made a batch of cookies while I waited 1 1/2 hours before giving up. I will call the original warranty support number on Monday during work hours to hopefully figure out how to return this product.This was a pretty good product until last week. I’m not saying you should not buy it. Just get it from a brick and mortar store so you can easily return it if it fails.
Mary W. Harrington –
the thermostat is easy to use
I left a 5-star review for the seller. The product gets 4-stars because the original unit (same model, but purchased and installed by a remodeling contractor) lasted < 6 years. That's twice the warranty period, but I feel an item such as this should last longer. Otherwise, the thermostat is easy to use, has a nice set of programming options, and works well.The original unit's display had gone blank. After verifying there was power to the unit, I bought the replacement, which was also blank. The seller had sent a nice email (via Amazon) to thank us for the purchase and say we should contact them if there were any problems. So I contacted them to ask about troubleshooting the unit. All representatives were busy, so I left a message. Mark, the owner, promptly returned the call. He was extremely professional, friendly, patient, and helpful. As it turned out, I had wired the unit exactly as the old one had been, but the wire pattern has changed. Note to self: always read the instructions. In fact, I had read the instructions - but I was reading the old users manual, which I had pulled out of a filing cabinet when troubleshooting the original unit. Second note to self: make sure you're looking at the correct manual. However, if I'd been paying attention, the wiring diagram is also on the back of the unit. I did not look closely at it because I'd already read the (wrong) manual. So if you are buying this as a replacement, BEWARE!It must be a common problem, because Mark guessed at it right away. Problem solved with Mark's courteous help. Thank you!Greg Harrington (on behalf of wife Mary, who's account was used for the purchase)
Eric –
Perfect replacement match
Replacement was an Exact match, easy install. Programming was the hardest part until I went to youtube. Do yourself a a favor go straight to youtube for programming.
Orpha Weese –
This product works GREAT. The thermostat that I had for my bathroom floor had issues after 23 years and we could not find a new one locally. Went on Amazon and got exactly what I needed. It was installed and my floor immediately started to warm up. Highly recommended
Amos –
After reading other reviews on this listing from other people who had an older one that needed replacing, I felt comfortable enough to give this a try even though it seems hard to nail down the exact same part number. My previous model had PB112B-120GB stenciled inside. New one says PB112D-GA. Based on other feedback I wondered if I might have to add a resistor inline with my already installed floor probe but I tried it without and it shows the correct temp so all seems well. It does look like there is a difference in the GFCI rating with the old stating “15mA GFCI” and the new one stating “Class A GFCI, 5mA”. But it works and the old one had failed stuck with a GFCI warning so who knows, maybe this one is more correct for my home. Or it is just working better now but will be more sensitive? I don’t know. I am just happy to have a warm floor again.
Amazon Customer –
I bought this to replace the original Honeywell thermostat. Could not find anywhere local to buy it. A bit disconcerted to see that though it looked identical the name, product number and wiring diagram on the back had changed. Initially wired it like the old one and didn’t work. However figured it out with help from a YouTube video and now working perfectly. The old one lasted 11 years.
jim –
Package arrived, does not say Honeywell, Box says Aube, was not happy at first, but googled âAubeâ and apparently Honeywell bought Aube on 2004.I already have one of these Honeywell thermostats in an other room in the the house, and it does look identical.
colin torraville –
For starters itâs not a Honeywell itâs their off brand. Second it didnât work and when I went to send it back I had to pay the shipping. Would not recommend buying from this buyer