Condensing boilers from Hoval
June 01st 2005 Hoval pre-mix condensing gas boilers are designed to couple high efficiency with low emissions and low cost of ownership. They include the UltraGas AM condens range (50- 1300 kW) and the TopGas condens range (30-83 kW), both featuring Hoval’s Ultra Clean combustion system. UltraGas condensing boilers are available in fourteen sizes with maximum outputs between 50 and 650 kW. Twin UltraGas units available with outputs of 250-1300kW, complete with common flue and optional pipework/header kits.
High efficiency 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.
When tested to the requirements of the European Boiler Efficiency Directive Ultragas boilers achieve net efficiencies of up to 109.5%, NOx levels of 20mg/kWh and 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.
standard controls include: - operating temperature control
- high limit cut-out with hand reset
- operating temperature display
- integrated frost protection
- connection of optional outdoor sensor for direct compensation of operating temperature
- heating pump control with overrun facility
- facility for control of calorifier primary pump
- fault diagnostic indication. The operation of each boiler is controlled via a 0-10v input signal (by the addition of an optional interface module). The allows BMS controlof either the burner firing rate or the boiler operating temperature set point.
TopTronic Controllers 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.
Low cost of ownership UltraGas boilers are designed to be easy to install and maintain to minimise overall cost of ownership. “We’ve installed around 60 Hoval boilers over the last few years - they are excellent boilers, well engineered and very easy to install,” commented Chris Clark of contractors Cooper & Brome. “Ultragas boilers have very few moving parts and are very easy to maintain because it’s so easy to get to everything. Features such as a fold-down platform for access and the use of gas-powered hinges for raising the burners all help to keep downtime to a minimum and to cut maintenance costs, which is very good news for the client,” he continued. More articles from Hoval Limited: | 
