Two independent zones with a shared heat source
The problem
Two zones — say a living floor and a bedroom floor, or two apartments sharing one boiler — must be heated independently, yet there is only one heat source.
Typical situations
- Two floors with different occupancy patterns
- Two apartments sharing one boiler
- Day and night zones with different schedules
- Main house and an annex on one heat source
The ThermoB solution
The RF2D3.WiFi system consists of two separate battery-powered wireless room modules and a shared BU3 WiFi receiver with three relay outputs. Each room module measures the temperature in its zone and sends its demand over a two-way 866 MHz radio link. The receiver drives zone 1 and zone 2 with separate relays — for example zone valves or pumps — while the third relay starts the shared energy source whenever at least one zone calls for heat. Frost protection is set individually per zone. The whole system is controlled from the mobile app or a web browser (MQTT/Home Assistant coming soon).
Interconnection diagram
Products required
| Product | Quantity | Notes |
|---|---|---|
| ThermoB Home · RF2D3.WiFi, Two-zone wireless room thermostat with WiFi receiver | 1 | Two room modules + a receiver with 3 relay outputs |
| Zone valve or circulation pump | 1 per zone | Per the hydraulic design of the installation |
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Send an enquiry – the products and quantities of this solution are filled into the form for you.
Optional products
| Product | Quantity | Notes |
|---|---|---|
| ThermoB Link · TB01/TB08, Wireless dry-contact signal transmitter (WiFi + RF) | 1 | If the receiver is far from the boiler and no cable exists |
Compatible systems
Benefits
- Independent comfort and schedule per zone
- The shared source runs only on real demand
- One receiver instead of two separate relay thermostats
- Both zones managed from a single app
Related solutions
No cable between the thermostat and the boiler
The boiler sits in the basement, a plant room or the far end of the home, and there is no thermostat cable run to the living area. Pulling a new cable means chasing walls, cable trunking and redecoration.
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The bedrooms overheat while the living room stays cold — the entire underfloor system is driven by a single thermostat and one temperature for the whole floor.
Radiators upstairs, underfloor downstairs — one system
The ground floor has underfloor heating with a manifold, the upper floor has radiators. The two systems need different control logic, yet a single boiler must start on demand from either of them.
Two-storey house with a pellet boiler — two zones, two pumps/valves, no cables, no overheat
The house has two floors, each with its own circulation pump or valve, fed by a pellet boiler. Each floor must keep its own temperature, the pumps/valve should run only on demand, and the boiler must start and stop automatically without being overheated. There are no control cables between the floors and the boiler room. Veri important requirement: a pellet boiler must not stop abruptly — the residual heat in its exchanger has to be carried away, otherwise it overheats.
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