We have a jet pump, a large holding tank, and a pump to send water to the pressure tank. That pump froze and split .
I lived in Mo. for 37 years, but born/raised in S W Ga which is about like living in S E Tx. I never had a pipe bust in Mo. Always in the county with deep wells 200-450 deep, well house, NO heat there, only thing that could freeze was the little pressure pipe that went to the pressure switch. But it only froze when the wind chill was like minus 30!!