Module 43 August 2012
What approximate percentage of the UK’s ‘greenhouse gas’ emissions are accounted for by buildings, according to the recent
Department of Energy and Climate Change (DECC) report?
15% 25% 35% 45% 55%
Approximately how many condensing boiler installations are there in the UK?
Up to 1 million
Between 1 and 4 million Between 4 and 6 million Between 7 and 9 million More than 9 million
What is the percentage of water vapour in the flue gas volume when methane fires a water heater with a lambda of 1.05?
15% 16% 17% 18% 19%
What is the maximum temperature normally required to condense water out of the flue in a natural gas water heater?
10°C 50°C 57°C 60°C 100°C
Which of these is least likely to be included in a continuous flow condensing water heater system?
A combustion fan automatically controlled to provide efficient combustion
A hot water storage tank A gas supply
A cold water supply and/or a return feed from a recirculating domestic hot water service
A drain 48 CIBSE Journal August 2012
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