Learn about using a Nest thermostat with a system that includes a hot water programmer

• The Nest Thermostat E is designed to work with combi boilers. If you have an Open Therm system it can control the hot water temperature.
• If your domestic hot water system uses a separate hot water tank, the Nest Thermostat E can not control hot water. Instead, we recommend installing a 3rd gen Nest Learning Thermostat which can schedule when your system heats the water in the tank.
• If you install a Nest Thermostat E on a system that has domestic hot water, you’ll need to keep your existing programmer. You’ll set the programmer heating schedule to always on while keeping your current domestic hot water schedule.

The 3rd gen Nest Thermostat can control your domestic hot water as well as your heating.

• If your current thermostat controls both your heating and your hot water, you can simply have a 3rd gen Nest Learning Thermostat installed. There’s no need to install a separate hot water programmer.
• If you currently have a thermostat and a separate hot water programmer, the 3rd gen Nest Learning Thermostat will replace both.