In a weather-dependent regulation the heat output of the central heating boiler depends on the temperature of the room, the required temperature and the outside temperature. The temperature of the boiler is reduced at high outdoor temperatures and increased at lower outdoor temperatures.
A weather dependent regulation saves energy compared to a room thermostat, because in that case the boiler keeps heating the water until it reaches the set temperature. In the past, the thermostat of the boiler was set lower in spring and higher in autumn, so the house was sufficiently heated. Using an outside temperature sensor this process can be automated. The relation between the outside temperature and the required heating temperature is called a ‘heating curve’.
The advantage of a weather-dependent regulation is that the other rooms are not dependent of the temperature measure in the reference room, and that each space by thermostatic radiator valve can have its own temperature setting.
On the other hand the boiler is always ready to deliver the required water temperature, even when all radiator valves are closed. The pressure on the pump increases, which causes the loss of energy or even a malfunction. Moreover, the creation of a comfortable but economic ‘heating curve’ is often a iterative process which requires all seasons to pass.