The location of the thermostat is very important as the following examples show.
Combi boiler room thermostat.
Traditionally the thermostat is connected to the boiler by wires running through the walls of the home.
Trvs are those nozzles located on the bottom of radiators usually with numbers 1 5 and an asterisk on them.
We have a great range of wireless thermostats available that make it easier to control your heating remotely.
3 wire thermostat and programmer.
This is the same operation as the volt free system except in this case line voltage is applied to the controls and boiler.
A boiler thermostat helps in controlling the boiler operation thus maintaining a proper set temperature inside the home.
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.
When heat is required the thermostat connects these two wires together applying the full mains voltage to the switched line terminal.
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.
The table below shows a selection of standard and smart programmable thermostats from honeywell baxi ideal nest tado and drayon.
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.
A boiler interlock motorised valves.
A room thermostat preferably a timed or programmable one.
This activates the boiler.
This is called a single channel programmer.
Thermostatic radiator valves in all rooms except the one with the room thermostat.
If the thermostat is also activated the sl terminal on the boiler is connected to line and the boiler operates.
A programmable thermostat for a combi boiler need only control the heating as the hot water is instantaneous.
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.