Jfisherman
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Can I shut down my New Yorker boiler for a long period of time without causing any problems during the summer season
AP-690 New Yorker Boiler
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Usually it's fine, if "long period of time" means turning it off for a few months (rather than years). Steel boilers are usually somewhat more forgiving than cast iron.
If it has a tankless coil for serving up the domestic hot water and you're running cold water through it to some other water heater there could be a lot of condensation on the heat exchanger plates.
The AP-690 is a pretty large boiler, with a DOE output of 131,000 BTU/hr, which is big enough to keep my sub-code 2x4 framed 2400' bungalow + 1600' of insulated basement toasty even when it's -150F outside ( like it was a couple of ice-ages ago.
)Hopefully yours has the intelligent boiler controls (not simple aquastats), or it's likely to take a serious hit in as-used efficiency due to oversizing. Most homes in PA wouldn't need a boiler even half that size (though some larger uninsulated stone or brick houses might.)
