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Thread: new oil boiler - what to look for?

  1. #16
    In the trades Dana's Avatar
    Join Date
    Jan 2009


    But does it match whole-system performance with their ductless H2i units? (With a variable speed air handler it might come close.)

    No R410A refrigerant system is going to have a COP of even 2.0 below 0F, but Mitsubishi keeps extending the low-temp operating limit. Most of the ductless units can still put out ~70% of their rated heat output at -13F, but it's barely breaking even (COP=1.1 or so, at mid compressor speed) at those temps. To be competitive with an 85% oil boiler at New England oil & electricity prices you need to be running a COP of 1.5-2.

  2. #17
    In the Trades Tom Sawyer's Avatar
    Join Date
    Nov 2010


    It matches it and then some. You can find the specs on their site.
    [B]No, plumbing ain't rocket science. Unlike rocket science, plumbing requires a license[B]

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