These are examples showing the most common wiring methods for multi-zone heating. I will not draw the wiring in detail, but only a block diagram, which is quite sufficient for explanation.
This connection also applies to underfloor heating and controllers.
This image shows how a combination of multiple thermometers, multiple servo valves and central heating, such as a heat pump or electric boiler, should work.
So, we have 4 rooms in the house. For every room, it applies that it should maintain a temperature of 20 degrees.
Thermometers from each room send the current temperature, but in room number 1 (step 1), the temperature dropped below 20 degrees. Sonoff gateway (iHost, Sonoff Zigbee Bridge Ultra, Sonoff ZigBee Bridge Pro, NSPANEL PRO) detected that in room number 1 the temperature is lower than the tolerance (step 1). Therefore, in (step 2) open the corresponding servo valve for room 1.
Possibilities of servo valves:
- The Sonoff TRVZB is used on the radiator.
- For underfloor heating, I use the Sonoff ZBMINI R2 Extreme combined with a servo drive designed for underfloor heating.
And it turns on the heater (step 3) using Sonoff Zigbee MINIR2 Extreme and it will turn on (step 4) heat pump, electric boiler, and circulation pumps on the storage tank and etc…
And let the heated water into the distributor, where through the opened servo valve it will start heating the respective room.
Traps:
- Temperature tolerance adjustable from at least 0.1 degree. For underfloor heating, a temperature tolerance of half a degree is too much. The floor is cold, it takes a long time to heat up, and the operation is uneconomical.
- If any thermometer reports a temperature drop below the set temperature.So the Sonoff MINIR2 Extreme, which controls the heating, must not be turned off. Even if the temperature in other rooms has been reached.
- The user must be able to add any number of thermometers to the scene and any number of devices that need to be turned on when heating is required.
As can be seen on the display, the heating will not stop until each thermometer reaches the desired temperature. This same procedure applies to every floor. It is universal for most heating systems.

