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Is a Watts 9D Dual Check back flow preventer necessary on a residential hot water boiler?
Double D
Member Posts: 447
A local inspector insisted I have one on my new installation. None of the surrounding towns require one.
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That local inspector sounds a lot like me when I was one, back in the time of the dinosaurs... I always required one. Depends on your local code -- and the AHJ.Br. Jamie, osb
Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England0 -
Where is this install?0
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The install is in New York, not too far from Lake Erie. Thanks for the suggestion in using the Watts 911s. I would consider using that one on future installs.0
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NYS code for at least ten years now to have a BFP on residential replacement boilers. I think it was the same year a LWCO was required.0
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Until now, the only component they have requested was the low water cut off.0
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A double check is just that -- two check valves in series, usually in the same overall body. A dual check with atmospheric vent -- like the Watts 9D -- is a bit more secure. A true reduced pressure zone backflow preventer -- like the Watts 009 -- is even more secure (dang near bullet proof). Depending on you code and AHJ, one of the three may be required. If the inspector wanted a 9D, that's what you should use. The protection it furnishes is intermediate between a dual check and an RPZ.Br. Jamie, osb
Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England1
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