[NestoG510]

Anybody with experience,

What is typically preferred, 120v or 240v mats for in floor heating?
And why?

 

[ArtisanRemod]

Many factors to be considered, and more info needed. What is finished floor material would be the main one, is finished floor height to be a factor, size of area to be heated? I normally use 120 electric, set in self leveling compound in bath floors, never an issue.

 

[Speedy Petey]

Many factors to be considered, and more info needed. What is finished floor material would be the main one, is finished floor height to be a factor, size of area to be heated? I normally use 120 electric, set in self leveling compound in bath floors, never an issue.

This. :thumbsup:

You can't simply ask what's better, 120 or 240V.

For me, the size of the mat is the typical deciding factor if 120 or 240v. Unless I have a close by 240V heating circuit, then I might tack it onto that.
Many that I do are only 20-30 sq/ft, so I will sometimes put it on the room's lighting circuit, or even the receptacle circuit if a really small bath or something like a bath that is not near any bedrooms.

 

[480sparky]

I prefer to use the voltage best fit for the application.

 

[Inner10]

I use 220, 221, whatever it takes.

 

[Golden view]

I use 220, 221, whatever it takes.

:laughing:

I can't believe I remembered where that came from.

 

[one man show]

gfci protected of course

 

[TNTRenovate]

100 sq ft and under 120v
over 100 sq ft 240v

Other than that there isn't much to consider. IMO.

 

[CarpenterSFO]

... or even the receptacle circuit if a really small bath or something like a bath that is not near any bedrooms.

Legal?

 

[Speedy Petey]

Legal?

Yes. NEC 201.11(3)Exc.

 

[Speedy Petey]

gfci protected of course

Every one I have done in recent years has been self GFI protected in the thermostat.

 

[CarpenterSFO]

Yes. NEC 201.11(3)Exc.

I think you mean 210.11(3)Exc. I suppose so, if the heat and other connected loads are under 10A (210.23(A)(2)). In practice, I've always mentally excluded heating loads from those circuits, but I can see it's not an absolute rule.
Thanks,

Bob