How to choose a thermostat?

HOW TO CHOOSE A THERMOSTAT?

First of all, you need to choose the right type of heating for your home. Most often this is done by distributing hot water in radiators (electric boilers, gas boilers, solid fuel boilers) - or using electric heaters (electric floor heating, electric water heaters, radiators, infrared panels).

 

Hot water heating:

1) Boiler circuit (one circuit or one zone - with a common set temperature)
Boiler thermostats are designed to switch the control electronics in the boiler. The function is ensured by the so-called voltage-free switching of the contacts of a small relay inside the thermostat, which does not transmit any voltage or current load. Therefore, these relays are rated for smaller current loads, typically up to 3A.

Thermostats suitable for boiler control:
B-3, Class B-3, TRB-3, Point-3, EB-160, B-100

For the operation of the thermostat itself and its proper functioning, it is necessary to supply the thermostat with AC 230V (L+N) mains power and two jumper wires from the boiler. The thermostats have an internal temperature sensor and are installed at a suitable point in the heated room.

The B-100 wireless model consists of two units: a switching module and a display module. The switch is usually installed near the boiler. Proper operation requires a 230V AC mains power supply (L+N) to operate the switch and two jumper wires from the boiler. It is also important to ensure that the router has a sufficient WiFi signal strength, since the main communication with the network takes place via this switch. The display module can be powered by batteries or an adapter. It contains a temperature sensor and can be placed anywhere in the heated room. The display module communicates wirelessly with the switch.

 

2) Switching of solenoid valves or actuators (multiple circuits or zones, with different temperature settings)
This is a common solution for hot water underfloor heating. Each valve is controlled by a single thermostat, where the desired temperature for the heated space can be set.

Thermostats suitable for controlling valves and actuators - depending on their type:
NC - "normally closed": B-3, class B-3, TRB-3, point-3
NO - "normally open": B-3, Class B-3, TRB-3, Point-3, EB-160, B100

If the valves are operated exclusively with AC 230V mains voltage, the models E-16, Class E-16, Class E-16W, Point-16, Ring-16, TRE-16, EB-160 can also be used for switching

Electric heating:

1) Smaller heated room (the power consumption of the switched devices does not exceed the maximum load of the thermostat)

Thermostats for electrical load control switch the AC 230V mains voltage directly and are designed for devices that behave like electrical devices. For example electric underfloor heating (for which the installation of a floor temperature sensor is recommended) or electric water heaters, radiators and infrared panels (for which a floor temperature sensor is not used). The function is guaranteed by the so-called voltage switching of the relay contacts inside the thermostat, which transmits a larger current - maximum 16A. However, it is recommended not to exceed a load of 10A, as switching large currents naturally heats the air in the thermostat and could affect not only the accuracy of the temperature sensor reading, but also the life of the switching contacts in the thermostat.

Thermostats that are suitable for electric heaters:
E-16, Class E-16, Class E-16W, Point-16, Ring-16, TRE-16, EB-160, B-100

For proper operation it is necessary to supply the thermostat with AC 230V mains power (L+N) and to connect the so-called load - switched heating (L1+N1). Electric heater thermostats have an internal temperature sensor and are installed at a convenient location in the heated room. They can also be connected to the supplied external probe on the cable to measure the temperature in another place or - depending on the setting - to measure the temperature in the ground (protection element against possible overheating).