Trvs are those nozzles located on the bottom of radiators usually with numbers 1 5 and an asterisk on them.
Combi boiler room thermostat.
This activates the boiler.
You can find out more about combination boilers and the best brands on our dedicated combi boilers page.
While your boiler thermostat and room thermostat are ways to control the temperature of your entire home and hot water thermostatic radiator valves trvs allow you to manage the temperature of individual rooms.
3 wire thermostat and programmer.
We have a great range of wireless thermostats available that make it easier to control your heating remotely.
Traditionally the thermostat is connected to the boiler by wires running through the walls of the home.
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.
If the thermostat is also activated the sl terminal on the boiler is connected to line and the boiler operates.
A boiler thermostat helps in controlling the boiler operation thus maintaining a proper set temperature inside the home.
This is called a single channel programmer.
The boiler only operates if both the programmer and thermostat are on.
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.
When heat is required the thermostat connects these two wires together applying the full mains voltage to the switched line terminal.
The table below shows a selection of standard and smart programmable thermostats from honeywell baxi ideal nest tado and drayon.
This is the same operation as the volt free system except in this case line voltage is applied to the controls and boiler.
It is often located somewhere neutral like the hallway but it can often be in the main living room of the house where occupants spend most of their time.
A boiler interlock motorised valves.
Thermostatic radiator valves in all rooms except the one with the room thermostat.
A room thermostat preferably a timed or programmable one.