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Author:
AZBill (AZ)
I want to install a back flow valve on my residential incoming water line.
Would I use a Pressure Vacuum breaker or a Back Flow Preventer Assembly valve?
Also, I have a 1" line coming in from the city which reduces to a 3/4" line for my home at a foot above ground level. So should I buy a 1" valve or a 3/" valve? So reduce before or after valve?
Thanks, Bill
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Author:
North Carolina Plumber (NC)
3/4" will be fine, use a Back Flow Preventer Assembly. You will probably need to add an expansion tank at the water heater if there's not one there now. You will be creating a closed system and you'll need to make provisions for thermal expansion.
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Author:
AZBill (AZ)
wonderful thank you, also I do have a tankless waterheater.
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Author:
North Carolina Plumber (NC)
In that case you can disregard the info about an expansion tank.
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