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View Full Version : Wiring a thermostat to 2 base board heaters


handy hank
Nov 9, 2008, 04:03 PM
I am trying to find out how to wire a thermostat to control 2 baseboard heaters. The thermostat is a 2 pole with 2 red and 2 black wires. The heaters are 240v and 1350 watts each. The power is connected to a double 30 amp breaker, as per manufacturer, and is routed through the thermostat junction box. I have sperate feeds going from this junction to each heater.

How should this connection be made? The manufacturer's diagram was not very helpful.

tkrussell
Nov 11, 2008, 06:05 AM
Try this, see attachment.

You, of course, since you are using a 30 amp breaker, all the wiring is #10 copper?

Why 30 amp circuit?

2 heaters at 1350 watts totals 2700 watts and at 240 volts only draws 11.25 amps, and minimum circuit size can be a 15 amp circuit breaker and #14 wire.

handy hank
Nov 13, 2008, 08:36 PM
Thanks for the wiring diagram, it was helpful. I did have everything hoked up correctly but had a loose wire arcing within the wire nut. It msut have come loose when mounting the heater to the wall. The 30 amp is overkill but I plan on adding on a large walk in closet and dressing room. This will require 1 if not 2 more heaters depending on the final layout and what else my wife decides to change.

Thanks again for the info, definitely reassuring.