We're in new York, and about to replace my 50 years old water heat boiler with 2 zones use circulators. Last time I check only one flow check valve was installed on zone 1 only which is same level as boiler location. I read some brand boiler manual piping.some have 2 flow check valves on same zone. And other manufactory only required 1 Valve for each zone. What's you guys think? I appreciate if someone can suggest me some answers🙏
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