Mains Pressure Combination Boiler
A combination boiler heats cold water direct from the cold mains supply as soon
as you turn on the shower or a hot tap in your home. The boiler is normally wall
mounted and you won't have a cold water tank (cistern) in your loft or a hot
water tank (cylinder) in your airing cupboard. Because the water supply to the
system is mains fed this produces a forceful showering experience.
For a powerful showering experience we would recommend fitting a digital or
mixer shower to this type of system. Alternatively, for a more gentle flow rate
you could use one of Mira's electric shower fitted to the cold mains, this is
also an ideal low cost option for a second or en-suite shower room.
Mains Pressure Unvented
An unvented mains pressure system stores mains pressure water in a large
strengthened hot water tank (cylinder), usually found in the airing cupboard.
The hot water will be heated either by immersion heaters fitted in the side of
the cylinder or by a central heating boiler. This type of system doesn't require
a cold water tank (cistern) in your loft and provides a high water flow rate &
pressure. Other systems also producing hot water at mains pressure are available
these are generally known as thermal store systems.
To make the best use of the flow & pressure of these systems we would recommend
a digital or mixer shower. Alternatively, for a more gentle flow rate you could
use one of Mira's eco mixer showers or fit an electric shower to the cold mains,
this is an ideal low cost option for a second or en-suite shower room.