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WATER HEATER PIPEWORK
Flow Rates
The primary pumps supplied with the hot water packages are designed to give a flow rate through
each unit of 16 litres/minute.
The pipework should be sized for a minimal pressure drop through the pipework. The total flow through
the header can be found by multiplying the number of units by 16 l/min.
The branches from the header pipe to and from each heater should be in 22mm.
The following guideline can be used when the heaters are near as possible to the cylinder.
For heaters separated from the cylinder the size of the pipe work may have to be increased. The pipe
sizes given are for Primary pipe work including the cold water header from the primary pump to the last
branch, and the hot water header from the outlet of the first heater to the connection point on the
cylinder.
1 heater: 16 l/min 22 mm
2 heaters: 32 l/min 28 mm
3 heaters: 48 l/min 28 mm
4 heaters: 64 l/min 35 mm
5 heaters: 80 l/min 42 mm
6 heaters: 96 l/min 42 mm
Insulation.
All pipe work should be insulated to minimise heat loss.
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