• In this video, This Old House plumbing and heating contractor Richard Trethewey explains how to install a programmable thermostat.

    Steps:1. Turn off service switch at boiler.
    2. Pull off cover from existing thermostat.
    3. Unscrew thermostat from its wall-mounted sub-base.
    4. Loosen wires connected to thermostat's sub-base.
    5. Remove the old sub-base.
    6. Hold sub-base of new thermostat to wall and connect red wire to "R" screw terminal, and white wire to "W" screw terminal.
    7. Drill new screw-mounting holes for sub-base.
    8. Push plastic wall anchors flush into holes and screw sub-base to wall.
    9. Insert batteries into the thermostat and snap on the cover.
    10. Turn the service switch back on.
    11. Program the desired on/off time and temperature of the thermostat.
    • Difficulty: Easy
      Success depends on simply following a few easy steps

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      Tools List

      • Nut screwdriver
      • torpedo level
        Torpedo level
      • drill

      Shopping List

      1. Programmable thermostat

      2. Two plastic wall anchors and pan-head screws

      3. Batteries
      used to power thermostat