Water storage tanks in domestic and commercial hot water systems require reliable electric heating solutions to maintain safe temperatures and prevent legionella. In installations involving Quadroflex QFS/QFDS/QF2DS models, integrators must ensure that the heating components match the tank design and thermal requirements. This kit offers a complete solution for retrofitting or replacing existing heating elements in these tanks. It is particularly suited for applications requiring controlled heating in medium-capacity systems.

The integration process involves matching the heating element length and flange dimensions to the tank’s internal geometry. Installers working on central heating systems or standalone hot water units should verify the tank’s internal dimensions and the required electrical connections before fitting. The three-phase supply ensures balanced power distribution and stable operation over time.

Technical parameters

EAN	3800879351237
Code	301457
Brand	QUADROFLEX

The 4.5kW rating indicates the total heat output available for water heating in tanks up to 500L. The 40.5cm length of the heating element ensures sufficient immersion depth for efficient heat transfer. The three-phase connection allows even load distribution across phases, which is important for maintaining operational stability and reducing voltage drops. These factors help determine whether the kit meets the thermal demand and fits within the tank’s physical constraints.

Installation and connection

Begin by inspecting the tank’s internal space to confirm that the 40.5cm heating element can fit without obstruction. The flange size (6/4-inch) must align with the tank’s opening to ensure a secure mechanical connection. Use the provided gasket to create a watertight seal between the flange and tank wall. Connect the heating element and thermostat according to the wiring diagram provided by the manufacturer, ensuring proper phase alignment for three-phase systems. Always disconnect the power before assembly and double-check all electrical connections for tightness and insulation integrity. Common errors include incorrect flange orientation and misaligned wiring, both of which can lead to reduced performance or component failure.

Compatibility and accessories

This kit is specifically designed for Quadroflex QFS/QFDS/QF2DS series tanks ranging from 200 to 500L. It is compatible with standard three-phase electrical supplies and integrates with the tank’s existing control systems through the included thermostat. For installation, ensure that the tank is empty and accessible. No additional components are required beyond those included in the set. Related items such as control panels or insulation materials should be sourced separately based on the system’s configuration.

Technical background for designers

The heating element operates by converting electrical energy into thermal energy through resistance heating. The stainless steel construction resists corrosion and maintains structural integrity in hot water environments. The thermostat regulates the temperature to prevent overheating and ensure consistent performance. When integrated into the system, the component must be positioned to allow full submersion while avoiding contact with the tank’s bottom. The longevity of the heater depends on the quality of the water, regular maintenance and correct installation practices. Thermal efficiency is maximised when the element is fully submerged and evenly distributed in the tank.

Service and operation

Periodic inspection of the heating element and thermostat is recommended to detect scaling, corrosion or electrical faults. Check the flange and gasket for signs of wear or leakage during routine maintenance. Ensure that the electrical connections remain secure and insulated. If the thermostat fails to respond to temperature changes, recalibration or replacement may be necessary. There are no specified service intervals in the documentation, but early intervention at the first sign of irregularity will extend the component’s service life.

Frequently asked questions

Can this heating set be used with non-Quadroflex tanks?
No, the set is designed exclusively for Quadroflex QFS/QFDS/QF2DS series tanks. Other models may differ in flange dimensions or electrical requirements.

What is the purpose of the included thermostat?
The thermostat monitors and controls the water temperature to prevent overheating and ensure stable operation of the heating element.

Is the heating element fully submersible?
Yes, the 40.5cm length allows full submersion in the water tank, ensuring efficient heat transfer.

How is the three-phase connection handled during installation?
The three-phase wiring must be connected carefully to balance the load across all phases. Incorrect wiring may cause uneven heating or electrical issues.