I enjoy a sulfur smell coming from my heat system, contained by the crypt? The system is a boiler (water) the only point it says...

The system is a boiler (water) the only point it says on the outside is National-U.S. The smell is not here when the heat is stale. What is this, should i worry?

Thanks
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Answers:    Has it lone just started, is it run by gas? if so it could be a gas leak.
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A unprocessed gas leak would smell close to rotten eggs (hydrogen sulphide). If you only smell this when the system is running, it could be a leach from the valve. Have it checked by a licensed technician. Any gas outflow is a potential explosion hazard
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