Net efficiencies of up to 109.5% are also achieved, when tested to the requirements of the European Boiler Efficiency Directive, with CO levels of 10 mg/kWh.Īll UltraGas boilers have a connection at the rear to accept a ducted fresh air supply for room-sealed applications They are also fitted with two return connections for high and low temperature circuits. Independent testing (to DIN EN 676) confirms the average NOx emissions of the boilers are less than 40 mg/kWh - achieving the maximum BREEAM rating of three points relating to NOx emissions. The aluFer tubes are also made of stainless steel with an aluminium alloy finned internal surface to provide a high surface area for heat exchange. Featuring Hoval's Ultra Clean combustion system, the boilers use a modulating pre-mix down firing burner with up to 6:1 turndown (12:1 on twin units) and a stainless steel combustion chamber with a single pass aluFer tube heat exchanger.
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