Heated Floor Question

[zequ]

Hello guys and gals,

I'm installing a wifi thermostat for a small bathroom radient heated floor. It's running on 240v.

There's already a 240v circuit for other heating in the house was was previously used by the small baseboard heater in the bathroom.

I've installed a new 20 amp breaker to use a dedicated circuit for the flooring and ran the wire to the same box as the previous thermostat.

It's a 16 CU wide Iberville type box.

The circuit for the other heaters is spliced in the box and the new 240v wire is connected to the new thermostat.

So one 12/2 spliced through the box. One 12/2 coming in. Heating wire header going out to the floor. Sensor wire.

Another option would be to use a 4x4 1900 box with a 1/2 inch one gang mud guard. Would that be better then the above?

 

[Klokwerk]

So, what is the question? You've already added the circuit breaker and ran wire for the thermostat.
Is the question what box should you use for the thermostat?

I just finished a Quiet Warmth heating system in my remodel and it sounds similar to your situation. Previous heating was baseboards running 240v. So I just used that circuit and existing breaker. The thermostat and wires fit nicely into a single gang box.
The runners to the heat mats all route into a 4x4 1900 box like you are thinking and are all tied together there then route up into the single gang to the thermostat.

So the answer I have for you is use both. But it depends on what system you're using really.

 

[zequ]

Hi Klokwerk, right now the box is the old 16 cu iberville box (Iberville BC3104).

I was just wondering if the bigger box would be better and safer because the thermostat has a built in GFI which makes the device bigger and it was a tight fit into the box.

The system is WarmFeet 3.7CWC-240V-24 with Ditraheat membrane.

Edited: I got the 4x4 with the 1 gang mud ring. Plenty of room to fill.