Honeywell Home THP9045A1023/U WireSaver, a C-Wire Adapter for Wi-Fi Thermostats or RedLINK 8000 Series Models

The THP9045A1023 is the WireSaver, a C-wire adapter from Resideo (Honeywell Home), for Wi-Fi and RedLINK 8000 series thermostats.

A Wi-Fi thermostat needs continuous 24 V power, and that means a common wire. In a house wired for a mechanical stat the common is usually not in the bundle — which turns a thermostat upgrade into pulling cable through a finished wall.

The WireSaver avoids the pull. It sits at the equipment and multiplexes the signals so an existing four-wire run carries what a five-wire installation would have needed.

This is the cheapest answer to the most common reason a smart thermostat retrofit stalls.

Goes with: TH9320WF5003, TH8321WF1001.

• Brand: Resideo (Honeywell Home)
• Manufacturer Part #: THP9045A1023/U
• Type: C-wire adapter (WireSaver)
• Used with: Wi-Fi thermostats or RedLINK 8000 series thermostats
• Color: Gray
• UPC: 085267543866
• Category: Thermostat Accessories