How can it have only two wires? Would it not need three? Positive, negative and themostat?

Its not power wire, its a control wire.

Can you just buy the cover?

I bought the whole thing I do not know if you can just buy the cover

we used it in a Northern Lite camper replacing a similar thermostat

don't know. I used it in my Northern Light camper

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Brand	Dometic
Model Name	38453
Controller Type	Push Button
Special Feature	Programmable
Color	White
Specific Uses For Product	mobile living space heating, controlling furnace temperature
Temperature Control Type	Manual
Connectivity Technology	Wi-Fi
Included Components	Hydro Flame 38453 Mechanical Thermostats - Heat Only, White
Power Source	Corded Electric
Item Weight	3.2 ounces
Voltage	230 Volts
Material	Plastic
Shape	Rectangular
Display Type	LED
Finish Type	matte
Control Type	Manual Control
Control Method	Touch
Connectivity Protocol	Wi-Fi
Mounting Type	Wall Mount
Style	Minimalist
Backlight	No
EU Spare Part Availability Duration	5 Years
UPC	692931384535
Global Trade Identification Number	00692931384535
Manufacturer	Dometic USA
Product Dimensions	3.6 x 3.5 x 1.5 inches
Item model number	38453
Is Discontinued By Manufacturer	No
Manufacturer Part Number	38453
Special Features	Programmable