RTH2300 /RTH221 will only work with a stand alone heat pump and will not work with heat pumps with auxiliary/backup heat.
RTH2510/RTH2410 will work with either a stand alone heat pump or a heat pump with backup.
Last updated:
RTH2300 /RTH221 will only work with a stand alone heat pump and will not work with heat pumps with auxiliary/backup heat.
RTH2510/RTH2410 will work with either a stand alone heat pump or a heat pump with backup.
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