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 They are also fitted with two return connections for high and low temperature circuits.

The operation of each boiler is controlled via a 0-10v input signal (by the addition of an optional interface module). The allows BMS control of either the burner firing rate or the boiler operating temperature set point. Optional TopTronic controllers (one or two) can be provided for enhanced control features including sequencing for modular installations. A lead/lag switch is provided for the twin boiler package.

Ongoing support
Hoval actively encourages an ongoing relationship with clients to ensure ongoing support for the life of the boiler. The company's service department provides technical support for clients, specifiers and installers.