Changing Water System From Gravity to High Pressure

Aqualisa showers are designed to work on the following high pressure water systems:

• Combi boiler systems (must have a minimum rating of 24KW / 80,000 BTU and have a fully modulating gas valve)
• Unvented cylinders
• Ground sourced heat pumps
• Air sourced heat pumps

Please note: our Thermostatic and Digital products are not designed to work on mixed supplies (e.g. mains cold / gravity hot) or combination cylinders due to inadequate cold water capacity and working head distance.

Digital products:

If the Smart Valve currently fitted is pumped (A2) this will need to be replaced.

If the Smart Valve currently fitted is standard HP (A1), this would suggest that the gravity water system has a separate booster pump to pressurise the water. In this case, the Smart Valve is already compatible for the change to high pressure, however the settings on the logic will need to be switched "HP Combi" if intended to be fitted on a combi boiler water system.

Thermostatic products - Bimetallic products changing to combi boiler system:

Products with the grey universal cartridge fitted will require a flow regulator to be inserted into the elbow of the cold water supply going into the shower. The regulator slows the cold flow down, helping to balance the amounts of hot and cold water mixing together. If the regulator is not fitted, this may result in poor showering temperature. On concealed models, if the elbow is difficult to access inside the wall, a pink multipoint cartridge (part # 022802) can be purchased. Pink cartridges are specifically designed for combi boiler systems and does not require the cold flow regulator.

Products with an orange gravity cartridge will require a pink multipoint cartridge (part # 022802) to be fitted.

Thermostatic products - Siren, Aspire, AQSL, & AQDL models changing to combi boiler system:

The appropriate hot water flow regulator will need to be fitted in the hot inlet of the valve. 3 regulators are available dependent on the KW rating of the boiler.

Thermostatic products - Bar Valves & DCVs:

No changes will be required.

Electric showers:

These products should already be fitted to a dedicated cold mains water supply which will be separate from the gravity system - if this is the case, no changes will be required.