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issue. First I’ll need some more info so I have a more complete picture of you situation.
Is this a steam or hot water system? if it's hot water is there anti-freeZe in the system and/or do you have a feed valve (see attached pic for typical) on the water supply line into the boiler?
Ok, assuming there is no anti-freeze in the system the shut off should be open. However, I'd keep an eye on the pressure gauge. If the pressure rises above 15 when the boiler is cold and not firing then the feeder is defective and needs to be replaced.
It should never be off unless the feeder is defective (and replacing it was put off) or if the system is filled with anti-freeze.
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