The thermal efficiency of a boiler is dependent on the heat lost in the exhaust gases. Wastage is directly related to the temperature of the boiler water since the exhaust temperature cannot be less than that of the boiler water.

Economisers reduce the temperature of exhaust gas by transferring its heat into the feed water before it enters the boiler, thereby raising its temperature and increasing the overall thermal efficiency.

“Improving thermal efficiency cuts fuel use, resulting in significant cost savings and reduced emissions. In fact, the capital cost of fitting an Economiser is often recovered within a pay-back period of 12 months.”