A horizontal gas flue that has concentric
tubes, i.e. one inside the other, arranged in this way so that
one tube carries out the exhaust fumes and the other brings
in the air for combustion. The combustion chamber is thus room-sealed
and safe.
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British Thermal Units. A measurement
of heat output now replaced by kW. 1 Btu / Hr = 0.000293kW.
A 90,000BTu boiler is approximately 26kW.
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The outside unit in an air-conditioning
system that disperses the waste heat and condenses the gas back
to a liquid.
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A trade name for flue liners made from
flexibly jointed stainless steel. This is used to line brick
flues to prevent carbon monoxide leaking into the house.
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A central heating system that does not
use pumps but circulates the water by gravity and water expansion.
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This is the hot water cylinder where
the water for basins and baths is heated by a coil of piping
inside the cylinder or tank. The coil of piping is connected
to the central heating system and acts as a radiator.
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A measurement of power, which may be
expressed as energy, consumed in a period such as kW/hrs.
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The term given to a group of bacteria
that thrives in water of between 15 and 450C. The bacteria can
infect susceptible people and result in an illness similar to
pneumonia. The bacteria has been found in shower heads and it
is therefore a good idea to have the domestic water supplies
from storage systems regularly flushed professionally if there
are persons using systems who are elderly or with health problems.
The systems particularly prone are older mixers where the hot
and cold are mixed remote from the head.
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A hot water and radiator system that
has a sealed pressure vessel to deal with expansion and a safety
valve to prevent damage. The advantage is that higher temperatures
can be reached, a header tank does not limit the height of radiators
and the system can be compact for flats. The system does need
special approval from the local council building control.
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A term used to describe comfort cooling,
commonly termed "air-conditioning", where the room
evaporator and the outside condenser are split and not within
a combined unit.
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Thermostatic radiator valve. A room
temperature sensing valve on a radiator, which locally switches
off the radiator at a preset temperature.
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