Is a back flow preventer necessary?

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Old 08-06-07, 11:56 AM
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Is a back flow preventer necessary?

I’m in the process of changing out my 50 year old boiler with a new Crown Aruba. The instructions call for a back flow preventer installed just past one of the isolation valves. Do I need a back flow preventer on a boiler if it’s installed in a one story house where the boiler is in the garage at approximately the same elevation as the radiators? My old system didn’t have one but I want to do this job right the first time and not have to take it apart after I’m done.
 
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Old 08-06-07, 06:16 PM
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Backflow Preventer

In a word, yes. It is a health safety device required by most plumbing codes. The purpose of it is to prevent boiler water from back feeding into the domestic if for some reason there is a loss of domestic pressure & the pressure in the boiler system exceeds that of the domestic.
 
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