How do you connect a 240 volt electric heater It is a baseboard unit the has a black and red internal wire for connection Do you use 12 2 wire or 12 3 wire The thermostat has 2 red 2 black wire?

Answer 1

2 wire (plus ground) is all you need for a 240 volt heater provided there is no 120 volt accessories in the heater such as a built in convenience receptacle. If cable is used, the white wire of the 2 wire cable will be a HOT-LEG even though it is white-this is one of the code exceptions. The size of the guage is dependent on the size of the load and other factors. 12 guage will handle up to 1500 watts generally.

Answer 2

For a 240-volt electric heater with black and red internal wires, you will need to use a 12/2 wire for the connection. The black wire should connect to one of the internal wires (e.g., black), the red wire to the other internal wire (e.g., red), and the white wire to the heater's grounding wire or terminal. The thermostat's red and black wires should be connected to their corresponding wires on the heater. Make sure to follow all local electrical codes and consult a professional if needed.