Seasonal efficiency of commercial condensing gas boilers?

October 29, 2009 by MyHybrid  
Filed under Engineering

fuel efficiency

the_wigan_pie_eater questioned:

I am tiresome to set up a reliable figure for the seasonal efficiency of cash-making extent natural gas fueled condensing boilers – say 33-100kW room.

SEDBUK publish a desk of the efficiencies for domestic units – is here an equivalent store charitable referenceable principles for cash-making units?