Northern Gardener

I live in Yukon. My water comes from a well. Its not running. Its very cold here but I had an electrician come and check my heating tapes from my well head. I bought a new pump on his recommendation, I had a new pressure tank last year. All plugs are in. What could it be? I've put a small ceramic heater into an outside box where the pipes seperate. It - 23but I'm afraid this heater will blow the pipes. The box is 4x4x6 feet.but outdoors.