[bbgrell77]

I'm installing 240 volt in-floor heating mats. The amperage draw is 21 amps. I intended to connect them to a 2-pole, 240 volt, 20 amp breaker. My thought was that you have two legs of 20 amp power (40 amps total). Is this correct of how the 240 volt breakers work?

[Stratmando]

Its 20 Amps total, you will need #10's and a 2 pole, 30 amp breaker.

[bbgrell77]

I was afraid of that. I think I will run two circuits since I already have a lot of 12/3 wire. The mats are in different rooms anyway. Thanks

[KISS]

For reference, since it's space heating, you multiple the current of the heaters by 1.2 and size up to next available breaker size, hence 30 A.

[Stratmando]

I was afraid of that. I think I will run two circuits since I already have a lot of 12/3 wire. The mats are in different rooms anyway. Thanks

How much draw and what volts for 1 heater?

[bbgrell77]

The amperage draw depends on the size of the mat. The largest one will pull 15 amps. The remaining ones are smaller and pull 6 amps combined. I'll split them into two 20 amp services which should work fine. Thanks for your input...