How much heat goes up your chimney?
January 1st 2007

Hoval Ultragas pre-mix condensing gas boilers are designed to couple high efficiency with low emissions and low cost of ownership. Featuring Hoval's Ultra Clean combustion system, they 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.

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.

How much heat goes up your chimney? In many industries, steam boilers are responsible for a sizeable proportion of fuel usage.

The typical temperature of flue gases flowing from the final pass of tubes from a 3 pass wetback 150 psi steam boiler would be 240°C.

This heat is then lost up the chimney to atmosphere but some of it could be recovered through using a flue gas economiser, says Byworth Boilers.

Using a flue gas economiser, typical efficiency gains are between 4 and 6% and capital payback period can often be as little as 12 months.

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