Expansion / Contraction of Ice
Where the plumbing code , does not exist, we see broken pipes by frezeen , usually in sites when is rare to have about - 2 - 3 °C , in my city there was a lon time when we have not such temps , but seldom it happen , and themn the pipes broke .
Most of our tank feeding pipes are at outside.
I never had seen a plumbre knowing whta is a calculus.
It shall be take in consideration that not all places have plumbing codes , but they can have a -1 -2 ° once in a century.