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What is this?

Mtncom12
Member Posts: 3
Anyone recognize this? I have a customer working on a job trying to figure out its function
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Comments
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I guess it's on a wood fired boiler system
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A thermostatic valve, a warranty requirement on Central Boiler products (though occasionally used with others) to keep return temp above 150*, though they almost never work like they're supposed to. If the underground lines and circulator are sized properly to maintain a good return temp, it can be removed or possibly even gutted (there is an automotive type thermostat inside that can be removed) depending on the system.
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That's awesome! Thanks so much for your help!!
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