Fast-STAT Common Maker - Adds a Common"C" Popular Wi-Fi Thermostats : Amazon.ca: Automotive
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Fast Stat Common Maker Add A Wire C On The Thermostat 662766588675 | eBay
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FAST-STAT Common Maker Guide
My existing thermostat is heat only (gas boiler) and has a 2-wire connection. To install a C-Wire ecobee support said to purchase a Fast-Stat Common Maker for each zone (makes sense), but
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FSCM00 - Fast-Stat FSCM00 - Common Maker Thermostat Wire Extender (Adds a Common C Connection)