Combi Boiler Room Thermostat

When heat is required the thermostat connects these two wires together applying the full mains voltage to the switched line terminal.

Combi boiler room thermostat. This activates the boiler. A room thermostat preferably a timed or programmable one. We have a great range of wireless thermostats available that make it easier to control your heating remotely. A boiler interlock motorised valves.

Thermostatic radiator valves in all rooms except the one with the room thermostat. 3 wire thermostat and programmer. A programmable thermostat for a combi boiler need only control the heating as the hot water is instantaneous. The boiler only operates if both the programmer and thermostat are on.

This is called a single channel programmer. They work by automatically sensing the air temperature and when the temperature falls to a pre determined setting the thermostat will tell the heating to turn on. You can find out more about combination boilers and the best brands on our dedicated combi boilers page. The location of the thermostat is very important as the following examples show.

Trvs are those nozzles located on the bottom of radiators usually with numbers 1 5 and an asterisk on them. If the thermostat is also activated the sl terminal on the boiler is connected to line and the boiler operates. A 2 wire thermostat is connected between line and the switched line terminal on the boiler. Water is heated in a special chamber of the boiler which is usually powered by gas or fuel oil and is then distributed to different rooms of the home via radiators or other heat distribution systems installed.

Traditionally the thermostat is connected to the boiler by wires running through the walls of the home. This is the same operation as the volt free system except in this case line voltage is applied to the controls and boiler. The table below shows a selection of standard and smart programmable thermostats from honeywell baxi ideal nest tado and drayon.