2-4 gallons depending on size of your plumbing system and appliances. You’ll need probably twice that if you have a water heater that takes anti-freeze (typically only on-demand water heaters recommend anti-freeze, but refer to your manual).
2-4 gallons depending on size of your plumbing system and appliances. You’ll need probably twice that if you have a water heater that takes anti-freeze (typically only on-demand water heaters recommend anti-freeze, but refer to your manual).