How efficient is your condensing boiler?
Use this calculator to estimate the mean boiler efficiency of a condensing boiler system given a return water temperature and percent load at different time intervals.
Unit Type
Operation Profilei
Hours running
Boiler Load % of rated capacity
Return Water Temperature °C
0%
0%
Did you know?
Condensing boilers are capable of achieving thermal efficiencies as high as 98%. However, their performance is highly influenced by two main factors: the return water temperature and the system's operating load.
As a general rule, maintaining return water temperatures around 50°C or lower is necessary to achieve true condensing efficiencies. Additionally, operating the system at part load—rather than full load—can further enhance efficiency by allowing more heat recovery from the exhaust gases.