I agree with MartinP. I had the same problem with an elevated tank. It would freeze in the tank and the pvc valve outside. I ran the valve inside where it would stay warm and used a shurflow pump inside that pumped back outside into the top of the tank to create a little areation. When sitting over night in real cold it may get a little slush but didnt freeze.
2021 230 Taps on vacuum
Smokylake 2X6 pan set with auto drawoff
Homebuilt 2 4x40 membrane RO
Homebuilt filter press
Rebuilt arch with under and over the fire air we have named V 2.0
Smokylake steam bottler
Hoods and preheater
500 gallon vertical polytank to store sap for RO
Adding a laser eye to my bottler for autofill/stop