Mains Fed Indirect System ~ now widely used as an alternative to
conventional systems. It eliminates the need for cold water storage
and saves considerably on installation time. This system is
established in Europe and the USA, but only acceptable in the UK
at the local water authority's discretion. It complements electric
heating systems, where a boiler is not required. An expansion
vessel replaces the standard vent and expansion pipe and may be
integrated with the hot water storage cylinder. It contains a
neoprene diaphragm to separate water from air, the air providing a
`cushion' for the expansion of hot water. Air loss can be
replenished by foot pump as required.
Hot Water Installations