shower

shower booster pumps
showers
choosing your shower booster pump
To select the most appropriate shower booster pump for your needs please refer to the chart below.
(The number of the pump in ‘Pump Type’, denotes feet pressure. For example a 50 will pump a vertical
column of water up to 50 feet.)
Pump Type HY PUMP70 HY PUMP50 V HY PUMP50 VSI HY PUMP50 SS
Pump Rating 2 Bar 1.5 Bar 1.5 Bar 1.5 Bar
Motor Rating † Continuous Continuous 15 Min. Continuous
240 V ● ● ● ●
Centrifugal ◆ ● ● ● ●
Single Shower ● ● ● ●
Variable Speed ● ● ●
Pre-Wired ● ● ● ●
Push Fit Connection/Hoses ● ● ● ●
Connections Supplied ● ● ● ●
Twin Impeller ● ● ●
Single Impeller
Inlet Size 15mm 15mm 15mm 15mm
Outlet Size 15mm 15mm 15mm 15mm
●
Choosing your Shower Booster Pump
† Motor Rating
A continuous motor rating indicates that it will run continuously without
overheating. Motors that have a time stated e.g. 15 minutes, will run for
that amount of time before it reaches a pre-set temperature and will then
automatically shut off. The motor must be allowed to cool before it can be
used again, after automatically shutting off.
◆ Centrifugal Pumps
A centrifugal pump includes internal impellers with radial blades. These spin very
fast when powered and move the water by what is called ‘centrifugal force’. The
energised water is then guided out of the pump through an outlet in the top of the
impeller casing and can be used to enhance the performance of showers. In a
centrifugal pump, the ‘flow out’ is at a right angle to the direction of the ‘flow in’.
Single Impeller Pumps
These are designed to boost the performance of a single water supply or mixed
hot and cold supply (blended water from a mixer valve) to a single outlet, such as
a shower handset or fixed shower head.
Twin Impeller Pumps
These are designed to boost the performance of two water supplies (hot and cold)
to for example, a mixer valve with separate flow controls. Depending on the
selected pump rating they can be used to boost the performance of two water
supplies to a shower valve.
Pump Positioning
Pumps should be situated as close to the water supply as possible and are best
installed near the base of the hot water cylinder. As such, they’re commonly
located in the airing cupboard.
Negative Head Systems
A ‘negative head’ situation commonly occurs when the position of the cold water
tank is below the shower outlet. In this instance, a manually operated ‘Negative
Head Operating Kit’ will be required.
Usable Water Storage
Pumps will empty water tanks more quickly than a standard system, so you will
need to check the capacity of both hot and cold water tanks to ensure the water
capacity is sufficient.
Electrical Connection
Pumps must be installed to all relevant IEE Wiring Regulations (BS7671) and should
be protected with a Residual Current Device (RCD) and have a pull cord, double
pole isolation switch.
Additional notes
Supplies to pumps should be dedicated and separate from all other devices.
The hot water to a pump should not exceed its recommended maximum
temperature. If the water supply to a pump is too hot, it can cause ‘cavitation’
which can affect the efficiency of a pump, causing an increase in operating noise
and potential hot water failure and premature failure.
It is advisable to fit easily accessible isolating valves to both inlets (where not
already supplied) to ensure easy maintenance and compliance with Water
Regulations. If in doubt, contact your local water authority.
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