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The Atag A200S OV Gas Regular Boiler is ideal for medium to large size properties with more than one bathroom and a high demand for hot water. The A200S OV Gas Regular Boiler is fitted with a stainless steel heat exchanger to ensure optimum efficiency and with a pre mix burner for seamless modulation has SEDBUK 'A' rating. The A200S OV Gas Regular Boiler also features a built in weather dependent energy management centre and user friendly Z ready control option. There is also an extensive range of flue options available for the A200S OV including concentric, twin and flexible liner. For added peace of mind the Atag A200S OV Gas Regular Boiler comes with a 2 year manufacturer's warranty.
In a closed hot water circuit water cannot be compressed so any expansion in volume, created by an increase in temperature, needs to be accommodated by the expansion vessel. When the water is cold the pre-charge pressure forces the membrane sack, within the vessel, to collapse until the pump is started when the sack starts to inflate. As the temperature in the hot water circuit increases, resulting in the expansion of the water within the circuit, the expanded water enters the sack creating additional volume and lowering the pressure in the hot water circuit. As the water temperature drops the pre-charge pressure force the water from the sack back into the hot water circuit.