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Identify this Honeywell thingy ?

Christina
Christina Member Posts: 6
See attached image. The picture is the top of the boiler. I am told this is gravity feed system two pipe system ("T" ??). The expansion tank in the attic has no guage on it. The front of the boiler shows LBS per square inch and Altitude. Its a Ideal No. 12 boiler converted to gas.
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