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What are normally-open hydronic zone valves used for?

In a hydronic (hot water) heating system electronically operated valves control whether hot water runs through a particular zone of the building, or not.

It seems to be a common setup for the valve to ‘default’ to being CLOSED to flow, and only open when commanded to do so via a thermostat signal. This seems logical (to me), as you only want heat supplied when you actually need it. This is the “normally closed” type.

However, manufacturers also sell a “normally open” type which would be OPEN to flow all the time, unless some control signal says otherwise.

What application(s) requires the normally open variant?


Note — Ditto for a chilled water system used for cooling, AFAIK.

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