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mercury7 · Jun 10, 2007, 10:05 AM

I would like to heat my new garage with electric baseboard heaters. The new garage is 20X24 feet. I will be using one 240 V 2 wire circuit running two heaters at a total of 3800 watts. I would like to have both heaters controlled by one wall mounted double pole thermostat.

How do I run the wire. So far I understand that I first run my one 240V line from my panel to the thermostat. Then I'm confused from what Ive been reading.

Do I run one line from thermostat to heater one, then from heater one a line to heater two, or can I wire both heaters two lines (one to each heater) wired from the thermostat. Once the sequence is determined what are the wiring details.

Thanks for your help

Stratmando · Jun 10, 2007, 10:15 AM

Are you wanting to switch one hot leg of each 220 volt heater?

mercury7 · Jun 10, 2007, 10:18 AM

What do you mean?

mercury7 · Jun 10, 2007, 10:32 AM

I'm not sure what you mean? I want to control both heaters from one wall mounted thermostat.

Stratmando · Jun 10, 2007, 10:38 AM

Trying to get info.
Do you have 2 220 volt wiring(4 Wires) going through box?
Does full load go through thermostat?
Can thermostats be set, remaining separate. And switch power off and on, from 1 switch?

mercury7 · Jun 10, 2007, 12:21 PM

I have one 240 volt wire going to thermostat ( 2 wires). I want to control both baseboard heaters with only one thermostat no need to control each independently.

Is your 220 reference my 240?

Stratmando · Jun 10, 2007, 05:11 PM

Yes, 240 is more accurate, However I find on this site, Posters often say 220, instead of 240
. I believe it is understood? 110 and 120 volt commonly intechanged, also 220 volts and 240 volts. Sorry about mixup.
Reread my earlier post. Ignore 220/240 volt confusion.

What I am trying to say, is if my earlier Post does not work, Thermostat may not handle current of two heaters may need contactor. Reread earlier post.
What wire size? And what breakers protect heaters? One Pair or two pair, Do both go through switchbox?
Also, is it possible to switch power on and off to both, and leave 2 thermostats alone?

mercury7 · Jun 11, 2007, 07:42 AM

"Bring the feed to the thermostat first. The stat will be a 2 pole also. Be sure the feed connects to the Line of the stat. From this point on you have two options. You can feed to one heater, then to another. or you can leave the stat with two cables, one to each heater alone.

These wires will connect to the Load of the stat.

With option #1, you have two cables in the stat outlet box, with option #2 you have 3 cables. Be sure the box you use is large enough to handle the 2 or 3 cables. If you use a 4 in square box with a single gang mudring you will be fine for both options."

This answer is from TK RUSSELL from same question posted under electrical