Yes, cold weather can significantly affect a tankless hot water heater in two major ways. First, incoming groundwater is much colder in winter, forcing the tankless unit to work harder and consume more gas to raise the temperature, which reduces its maximum Gallons Per Minute (GPM) output capacity. Second, sub-freezing outdoor temperatures pose an extreme risk of residual water freezing inside the heat exchanger coils, causing the copper tubing to crack and rupture. Verification: Insulate outdoor supply pipes and ensure freeze protection features or draining protocols are active.
1 votes
Marked as accepted