This will almost certainly be a condensing boilers. Condensing boilers are more efficient because they extract the heat from the hot exhaust gases (or ‘flue gases’) that all boilers produce.

Flue systems and chimney systems are designed to evacuate combustion exhaust from furnaces, boilers, and other fuel-burning devices. They are also used with gas stove vents, pellet stove vents, and ...

Conventional natural gas-fired boilers exhaust flue gas direct to the atmosphere at 150–200 C, which, at such temperatures, contains large amount of energy and results in relatively low thermal ...

make sure the flue exhaust (the external pipe that vents gases from inside to outside the home) is not covered by any foliage, Tyrone advises. Debris like leaves and twigs can easily block the flue ...

It was the first locomotive to have a multi-tube boiler - with ... a single flue or twin flue. The blast pipe also increased the draught to the fire by concentrating exhaust steam at the base ...

Carbon Cap’s technology is designed to increase the efficiency of boiler systems in buildings by reusing the heat from exhaust flue gas, therefore reducing greenhouse gas emissions. Funding for the ...