Question about insulation of pipes with Boiler

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tomsloancamp
tomsloancamp Posts: 89
in Oil Heating
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Basement in our new(to us) house is quite warm and I assume it’s from the Boiler. I started to insulate to pipes but wasn’t sure if I should insulate all the way to the circulator? Also, some of the copper pipe is wider than 1 inch but I don’t seem to see any foam insulation larger than 1 inch.

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  • hot_rod
    hot_rod Posts: 28,705
    edited November 2025

    there are a number of online insulation suppliers and prices are reasonable

    Do not use the cheap foam that you find at hardware stores, it will not hold up at boiler temperatures

    Armacell is a good name, the split version with the glue tab works well, 3, 4” and larger is available

    Probably you have 1 or 1-1/4 tube

    It will be 1-1/8 or 1-3/8” OD

    1-1/2 copper is 1-5/8 OD

    The heat loss from the pipes is still within the building, but no need to have a hot mechanical room

    IMG_1488.jpeg
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
    tomsloancampRobert_H

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