In this type of system there are separate flow and return pipe
for each radiator and also to cylinder connected to the boiler. Once the heated
water passed through a radiator, it does not pass through another but it goes
directly back to boiler for re-heating. This method helps (a) to maintain the
water temperature near boiler flow temperature to all radiators. (b) Heated
water can be circulated at high speed through each radiator. These enable
relatively small radiators to provide high heat output.
The flow and return connections can be at bottom ends of the radiator. The
system is easier to balance at any temperature, if radiator have control valve
or lockshield valve (refer radiator section for detail) to regulate the water
flow through the radiator, this is now the standard installation method,
otherwise those nearest to the pump would take more than their share of heated
water, causing a ‘short circuit’, and rob heat from radiators farther away.
Extra radiators can be added to the system.
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