And electricians out there

You have a 60 amp meter socket with a 60 amp breaker box? If so, And the distance from the meter socket/breaker box is less than 100 feet, then the breaker box should have no more than 20 amp breakers [or fuses] to protect the downstream wire and pump. I am assuming # 12 copper wire. This will provide plenty of extra electricity for the heaters. Split the 220 volt in the well house into [2] 110 volt plug in outlets. Then you can decide what type of heaters to use and easily change them to a different type if you want to. And unplug them when not needed.

My jet pump draws 13 amps at 110 volts. 20 amp circuit breaker. #12 wire @ 50 feet. I am not an electrician.