Aquarius vented undersink units can also be supplied by a cold water cistern (feed tank).

In such cases, the base of the cistern must be no higher than 10 metres above the top of the water heater and a vent pipe must be used.

Oversink units are supplied with an inlet valve that, when opened, allows the mains cold water supply to enter the heater and displace the hot water stored in the cylinder.

As the valve controls the displacement, the outlet is open to atmosphere so that when the unit heats up, the expanded water is allowed to drip from the spout into the basin. No other outlet should be used in conjunction with this type of product.


  • Typically, they are supplied from the water mains although supply from a cistern can be used as long as there is a minimum head pressure of 3 metres.
  • The 3kW element provides a fast recovery from cold whereas the 1.2kW version means that Aquarius can be fitted in situations where the power supply may be limited, such as portable or temporary buildings.
  • Made in the UK.

Guarantee stated here applies to UK installations only. For details of guarantees in other countries, please consult your local supplier.

If the water heater is supplied from the water mains, a vented tap or vented mixer must be used. This ensures that the water expansion during the heat up cycle is allowed to vent without restriction.

Please refer to the Vented Taps section for full details of our range




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