Without them, descaling is slow and messy. We include the valve kit in Preferred and Authority tankless installs because it makes every future service easier.
See tankless descaling.
Isolation Valves (Tankless Service Valves)
Isolation valves are a pair of valves with service ports installed on a tankless water heater’s hot and cold lines so the unit can be isolated and flushed without draining the house.
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