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Instantaneous gas-heated showers (e.g. combination boilers)
The shower control MUST be installed with a multipoint gas water heater or combination
boiler of a fully modulating design (i.e. where the water draw-off rate indirectly
controls the gas flow rate to the burner).
A drop tight pressure reducing valve MUST be fitted if the supply pressures exceed 5
bar maintained.
An expansion vessel MUST be fitted (and regularly maintained) as shown in the
diagram below to ensure that excess pressures do not damage the product. This may
already be fitted within the boiler (check with the manufacturer) and is in addition to
the normally larger central heating expansion vessel.
The hot supply temperature MUST be at least 12 °C hotter than the required blend
temperature for optimum performance.
HOT
COLD
Gravity fed showers
The shower control MUST be fed from a cold water storage cistern and hot water
cylinder providing nominally equal pressures.
11
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