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    morrgs's Avatar
    morrgs Posts: 1, Reputation: 1
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    #1

    Aug 20, 2010, 07:26 PM
    Can I use the Honeywell wireless W8665a 1009 thermostat with my 2 wire steam heat sys
    Does anyone know if I can use the Honeywell wireless thermostat (w8665A/T8665A) with a 2 wire steam heat boiler? I measured 24 volts at the 2 wire connection. I do not have A/C, just steam heat.
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
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    #2

    Aug 21, 2010, 09:04 PM

    Honeywell says that's an obsolete product. The wiring insttructions for the receiver is here: http://customer.honeywell.com/techli...0s/69-1630.pdf

    There is no fundamental reason why it can't work. The receiver must be powered so you'll have to locate power and common.

    Their prestige series, I think, replaces it.
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