How do I wire up my fahrenheat F25408 baseboar heater?

Here is the link for the owner's manual. Or call customer service at 1-800-654-3545. http://www.manualshelf.com/manual/fahrenheat/fzl4004/instructions-assembly.html

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are you sure it isnt a 120/220 volt hearter?

Here is a link to the wiring instructions, which has detailed pictures and instructions. This should make it a lot easier. http://www.marleymep.com/en/multimedia-library/pdf/fahrenheat-pdf/products/f2500-series/F2500wiring.pdf

Hello. The red and the black are the hot wires. Therefore, connect one of your conductors to the red and the other conductor to the black. Use wirenuts. The bare ground wire should be solidly attached to the new unit's green wire using a wire nut.
Regards, Joe
PS: please rate my answer. Thank you.

http://www.marleymep.com/en/fahrenheat/products/baseboard-heaters/electric/f2500-series.aspx
on the bottom is a pdf for wiring

I can help you if you still here.

how to wire this unit

You need a meter, it will be hard without this! If you have 220v in the wall, then think of it like this; each wire is 120v. Test to each other, you get 220v. The thermostat is a double pole, you said. So think of it like this, its an adjustable temperature controlled switch that lets electricity through at the temp. you set it at. If you have 120v from one wire connected to one end of the element, and the other 120v connected to the other end of the element, then it will work. DO NOT CONNECT THE 120V TOGETHER. IT MUST GO THROUGH THE ELEMENT FIRST. The thermostat should be between the power from the wall and the element, to control the temperature.

You can be assured that the element is 240 volt. The fan motor is also rated at 240 volt. the wires you have black - black are the connections you make to the line. Use a 12/2 with ground. Use a double pole 20 breaker in your panelbox. The green wire is the equipment ground - connect this to the bare wire from the 12/2. On the 12/2 cable - there will be two colors, one black and one white. Wrap a couple of turns of black tape on the white wire both at the heater location and on the white in the panelbox. connect the 12/2 to your 2 pole breaker, the black wire and the taped white to the breaker.