Hoval has now extended the capacity of its high-efficiency UltraGas condensing gas boiler range to 1MW. Single UltraGas units now offer capacities from 50kW to 1000kW, while twin UltraGas units offer outputs from 250kW to 2000kW – complete with common flue and optional pipework/header kits.
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. 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.
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. 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.
All UltraGas boilers have a connection at the rear to accept a ducted fresh air supply for room-sealed applications