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Heating an Old House: Gas Heat Options

ILikeEmOlder
ILikeEmOlder Member Posts: 10
edited January 16 in Gas Heating

1700s house in climate zone 6. Gut rehab began in 2021. Current heatload of the building is 70K Btu (conservatively speaking).

Current heating setup is 60K Btu mod-con combi boiler (in the cellar) feeding staple-up plated radiant tubing for the 1st story; 120K Btu 2-stage furnace (in a conditioned attic) serving 2nd story and attic spaces. Furnace was installed in 2021 to serve the entire house when heatload was just about 130K Btu. Combi boiler went operational about a week ago.

IMG_0441.jpeg

I am between the following options for dealing with the existing furnace. Option 1: Replace existing furnace with 60K Btu modulating furnace. Option 2: Keep existing furnace (as emergency heat source), and add 40K Btu hydronic air handler. Option 3: Replace existing furnace with mod-con boiler connected to a hydronic air handler.

Thoughts?

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