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How to identify a low resistance hydronic boiler.

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snoop
snoop Member Posts: 10
edited October 2017 in Radiant Heating
I am looking at redoing some of the plumbing around my boiler to support 2 zones. While reading the book "Modern Hydronic Heating" it shows a boiler setup with 1 pump and 4 way valve. It mentions that this setup can only work on a boiler with low resistance as the momentum in the primary look will keep the water circulating. I don't understand how to identify if I have a compatible boiler thats "low resistance".

My boiler is a Crown Aruba DG225 with an output of 180k BTU and I think its about 30 years old.

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  • Zman
    Zman Member Posts: 7,569
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    Older cast iron boilers like yours are exactly what he is referring to.
    "If you can't explain it simply, you don't understand it well enough"
    Albert Einstein
    kcoppdelta T

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