PRESSURE TANK EXPANSION VESSEL 18L RED DIA 3.4″ (5GALLON)

Easy to install and alleviates the need to fit a feed and expansion tank in the loft. Air and water are separated by a flexible diaphragm.
This size can be wall mounted.

Easy to install and alleviates the need to fit a feed and expansion tank in the loft. Air and water are separated by a flexible diaphragm.
This size can be wall mounted.

This Pressure Tank Expansion Vessel is a small tank used to protect closed (not open to atmospheric pressure) water heating systems & domestic hot water systems from excessive pressure. The tank is partially filled with air, whose compressibility cushions shock caused by water hammer. It also absorbs excess water pressure caused by thermal expansion.

Expansion Vessels operate on the basis that the internal chamber is separated by a rubber membrane; inside this membrane sits the water (surrounding this sits a pocket of air). As the water inside the sealed system is heated, the water pressure increases. Being that water is non compressible, the air inside the air chamber of the Expansion Vessel will become compressed, thus leaving the system safe from over pressurization. As water can increase by 4.5% volume when heated from 0-100° C, a Expansion Vessel is a vital part of any sealed heating system.

Not for use with potable water.

Technical Description:

Maximum Working Pressure :
Inlet Connection Size: 3/4″ BSP
Heating Extravarem Expansion Vessel
Capacity: 18.00 Litres

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