There's also dry pipe systems, by which the pipes only fill with water as soon as the system is activated. this way, the pipes gained’t freeze In the event the making goes unheated inside the Wintertime months.
From https://patch.com/north-carolina/raleigh/classifieds/gigs-services/467764/safeguarding-lives-and-property-all-american-fire-protections-quarter-century-of-excellence