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national boiler

tazz Member Posts: 2
I am looking for info on the following boiler;

 national u.s. radiator corp.

 Johnstown PA.

model # a/u 13

It is a 65,000 btu boiler with a hot water heat exchanger at the outlet with an external tankless at rear of boiler.

I would like to know if i can cut both hot and cold water supplies to both without any adverse reactions.

Thanks phil
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