OpenTherm is a communication hardware standard and software protocol that enables control of gas central heating (condensing) boilers. Typically this control is achieved using a 'smart thermostat' but the the technology has the potential to be used for so much more.
OpenTherm enables control of the boiler's water temperature and the correct 'Control Setpoint' at all times. Basic on/off heating controls (including Time, Proportional & Integral (TPI) controlled heating systems) have no affect on the boilers water temperature and this is always controlled by a fixed preset value (normally set at the boiler). This is not the most efficient way to run the boiler, especially when heating demand is lower than in winter months.
