ya pipe freeze def high on list - there was broken bearing on gas-powered fan heating system in basement so when heat on make HUGE loud noise like airprane
get so hot repairman who take first looks say no run unless house cold enough freeze pipe or else fan overheat causing meltdown of epic portions
they send new man next MORNING to fix so fast, so reliable, much service
i ran it for 30 min 3 or 4 times in the night so pipe live