Digital Screen to indicate the water temperature. Heat exchanger made of high-quality pure copper. Internal Stainless steel pump plate for water sensor. Summer / Winter switch. Works effectively with the lowest water pressure. Safety child lock. Disconnects the heater, when the water temperature exceeds the safety limit, reconnects it automatically, after the temperature decreases. Cuts off the gas, when the flame is extinguished for any reason to prevent leakage of gas. Cuts off the gas, in the case the temperature reached its maximum. Sensitive to high exhaust temperatures.