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How to Diagnose Leaks in a Steam Boiler | Ask This Old House

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Ask This Old House plumbing and heating expert Richard Trethewey helps locate the leak on a steam boiler that is losing water.
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Steps for How to Diagnose Leaks in a Steam Boiler:
1. Set the thermostat at a high temperature to turn on the boiler, and leave it running during diagnosis.
2. Once the boiler has turned on, check the floor around the boiler. This would indicate a leak on the water side of the boiler.
3. Check all exposed piping, especially at the joints for a leak.
4. Check the main vent of the system to locate a leak.
5.If there are no leaks near the boiler, check the radiators in each room. Look for signs of water around the hand valve, at the connection of the steam pipe to the radiator, and at the air vent on each radiator.
6. If there are no obvious places where water is leaking, shut off the boiler and allow it to cool. When the boiler has cooled down, remove the vent pipe and inspect inside for any corrosion on the boiler itself.
7. Work with a qualified plumber or HVAC technician to repair any damaged or leaking areas.

About Ask This Old House TV:
Homeowners have a virtual truckload of questions for us on smaller projects, and we’re ready to answer. Ask This Old House solves the steady stream of home improvement problems faced by our viewers—and we make house calls! Ask This Old House features some familiar faces from This Old House, including Kevin O’Connor, general contractor Tom Silva, plumbing and heating expert Richard Trethewey, and landscape contractor Roger Cook.

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How to Diagnose Leaks in a Steam Boiler | Ask This Old House
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Ask This Old HouseConstructiondiyDIY Ideasdo it yourselfhome improvementHome RepairHow To BuildHow To FixHow To InstallInstallationinteriorInterior DesignKevin O'Connorleakleaks in steam boilerPlumberplumbingrenovationRenovation Ideasrepair steam boilerRichard Tretheweyroger cooksteamsteam boilerThis Old HouseTom Silva

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  3. Whomever serviced that boiler must not have done it right (or is an idiot) because there's no way you miss a hole like that when you clean it (tune up) properly. You most certainly lose some water having steam heat, think about it when you are boiling water on your stove does it not escape through the vents of the lid or push out the edges? The vents on the sides of the radiators are doing just that-venting some and that little bit from each radiator happening over and over eventually leads to some water loss there hoss.

  10. I’m in NJ and have a steam boiler very similar to the one featured here. Been having problems with it and every “expert” I call has no experience with steam boilers. Need someone knowledgeable like this guy.

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