One Pipe System ~ the hot water is circulated around the system
by means of a centrifugal pump. The flow pipe temperature being
about 80°C and the return pipe temperature being about 60 to
70 °C. The one pipe system is simple in concept and easy to install
but has the main disadvantage that the hot water passing through
each heat emitter flows onto the next heat emitter or radiator,
therefore the average temperature of successive radiators is
reduced unless the radiators are carefully balanced or the size of
the radiators at the end of the circuit are increased to compensate
for the temperature drop.Hot Water Heating Systems