Mira Montpellier Installation, Operation, Maintenance Manual page 11

Gas Heated Shower -
The shower MUST be installed with a gas water heater or
combination boiler of a fully modulating design. A modulating boiler is one that the
draw off rate is indirectly controlling the gas flow to the boiler, producing a relatively
constant hot water temperature (only suitable for products with 6" and 8" roses).
Cold Hot
Unvented Mains Pressure Shower -
The shower can be installed with a
unvented, stored hot water cylinder. Only "a competent person" as defined by the
Building Regulations may fit this type of system.
11