8
Pumped Systems
Pumped systems use a booster pump to increase the pressure of the gravity fed water
supplies.
These booster pumps are used where the head
of water is insufficient to provide a satisfactory
shower or where a high performance shower is
required.
Please ensure that the performance of the pump
is matched to suit the shower.
Follow the instructions for gravity fed
installations taking into account the installation
requirements of the pump.
Ensure that the hot and cold water storage
capacity is sufficient to supply the shower and
any other draw off points that may be used
simultaneously.
Most pumps require a minimum head of water
to allow the flow switches to operate
automatically. Where this is not available a
negative head kit may be required to operate
the pump.
Please consult the pump manufacturer’s
installation requirements
Modulating Combi Boiler / Instantaneous Gas Water Heater
The drawing shows a typical installation of a shower valve in conjunction with a combination
boiler.
Combi boilers will produce a constant flow of water
at a temperature within its operating range. However
we recommend that the system should supply hot
water in excess of 60˚C.
The hot water flow rates are dependant upon the
type of boiler / heater used and the temperature rise
required to heat the cold water to the required
temperature.
The cold water flow rates may be much greater as
they are generally unrestricted from the mains cold
water supply. To ensure relatively balanced flow
rates, we recommend that a pressure reducing valve
or 6 l/min flow regulator is fitted in the cold water
supply pipe.
Cold Supply direct
from mains
Pumps
