Semiatek 4 Hermann Saunier Duval condensation boiler. Art. 0010016104. Energy efficiency A (92/42/CEE) with returns of up to 109.2%. Power 25kW. Health hot water production 14 l/min. Low NOx emissions - class 5 (EN 483). Total premixing burner and primary exchanger in alloy of aluminum-silicon anti-corrosion. 2-speed, high- efficiency circulator.