Aqualisa 435901 QZ ELECTRIC 8.5KW ENGINE

SUMMARY

Aqualisa 435901 8.5 kW Electric Shower Engine

The Aqualisa 435901 is a full-internals replacement electric shower engine rated at 8.5 kW. It is designed as a direct replacement for the original shower engine in select Aqualisa electric shower units, restoring pump, heating and control electronics to “like-new” condition where compatible.

Function

This shower engine supplies electric heating and water flow control for compatible Aqualisa electric showers, managing heating elements, thermostatic control, solenoid valves and safety cut-outs. It replaces the complete internal module — pump, heater and control unit — allowing continued use of the existing shower casing, trim, handset and hose when installed correctly.

Confirmed Compatible Aqualisa Shower Models

• Aqualisa Quartz Electric 8.5 kW electric shower
• Aqualisa Lumi 8.5 kW electric shower
• Aqualisa Sassi 8.5 kW electric shower

These models are documented by multiple spare-parts retailers as using the 435901 electric shower engine. Always verify your shower’s model code and power rating before ordering to confirm correct engine match.

Installation & Compatibility Notes

Installation requires that the shower unit is an electric model rated 8.5 kW and originally configured for the 435901 engine. Ensure existing casing, controls and plumbing match manufacturer specifications, and follow all safety and electrical regulations when installing. Retain original frontline components (cover, thermostat knob, handset, hose) if they remain compatible.

When Replacement Is Recommended

Replace the engine if the shower fails to heat water, heating performance degrades, electric safety faults occur, or the original internals become irreparable. Installing a correct 435901 engine restores electric shower function—re-use of the existing shower enclosure can save cost and avoid large-scale replacement.

FAST DELIVERY

• Delivery of this item is priced as a 'small packet'. UK delivery costs £5.95 incl. VAT.
• For all in-stock spare parts the typical UK delivery timescale is 2-5 working days.
• If you need a part urgently then we can provide a next-day (delivered Mon-Fri) UK delivery service for all in-stock small parcels ordered before 3.00pm, Monday - Friday.
• Next day delivery is available to select at an additional charge during the checkout.
• We delivery WORLDWIDE. For more information about international deliveries, read our delivery page.

RETURNS

• If you need to return a part then please telephone Di Vapor on 0121 705 0866 with the reasons for the return within 14 days of receiving the goods.
• For more information please see our terms and conditions.