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Gravity conversion protecting boiler
I am replacing a boiler on an old gravity system. I am using a non condensing boiler. I usually pipe the boiler P/S on this type of system to protect the boiler. The last one that I did, I was talking to someone at Burnham's technical service on the phone and he told me that Primary/ secondary will not protect the boiler and that I should use some type of bypass valve. Is he talking about a four way mixing valve or something different? I looked on Taco's website and couldn't find anything. Who makes one? Also was the Burnham guy correct in saying that piping it Primary/ Secondary does not protect the boiler? I was always under the impression that this was a good way to protect the boiler on a gravity conversion. Thanks for any help.