BKC has been supplying and producing hot water boilers for many years, and has gained a lot of experience over the years. For example, the modern BBK boiler is specially designed for ultra-low NOx emissions with a quiet combustion, which is achieved by applying a large diameter fire tube with a long burn-out length. NOx emissions of 35-40 mg at 3% O2 are possible, depending on the type of burner.
The BBK is a highly efficient single-pass boiler with an economiser and an efficiency of at least 83% without a condenser at full load and a return temperature of 65°C. The boiler has also been designed to work well together with a heat storage tank.