OpenTherm is a standard 2-wire communication protocol between thermostats and boilers/heat pumps for modulating heating control, allowing smart thermostats (Nest, Tado, Honeywell) to optimize boiler efficiency.
| Pin | Name | Function | Type |
|---|---|---|---|
| 1 | OT+ | OpenTherm signal positive | BUS |
| 2 | OT- | OpenTherm signal negative | BUS |
OpenTherm is a standard 2-wire communication protocol between thermostats and boilers/heat pumps for modulating heating control, allowing smart thermostats (Nest, Tado, Honeywell) to optimize boiler efficiency.