User guide

10
Typical Suitable Installations
1. Instantaneous multipoint water heaters and combination boilers
The shower 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).
An expansion vessel MUST be fitted (and regularly maintained) if any form of
backflow prevention device is fitted, e.g. non-return valve, PRV. This will ensure
that excess expansion or pulse pressures do not damage the product or the
plumbing system. The expansion vessel may already be fitted within the boiler
(check with the manufacturer) and is in addition to the normally larger central
heating expansion vessel.
Figure 1
HOTCOLD