Domestic waterworks WZI 250 / 50L

Product detailed description

This domestic water supply unit is typically installed in residential properties, summer houses, or small agricultural buildings where a reliable, low-maintenance water supply is required. The system is ideal for users with moderate water consumption needs, such as households of four to six people. It operates on standard 230 V AC power and is suitable for continuous operation throughout the year. The unit is not recommended for aggressive water sources or environments with extreme seasonal variations unless stainless steel components are used.

Installation is usually carried out in a utility room, basement, or near the water source. The system connects to the water source via a suction pipe and delivers water through a distribution network. The pressure tank ensures stable water pressure during operation and reduces pump cycling. The compact dimensions (77 x 71 x 41 cm) make it suitable for tight spaces. The unit is not intended for high-pressure or high-flow applications beyond its specified performance limits.

Technical parameters

EAN	8585054501090
Inlet cable length (m)	1
Maximum flow rate (l/min)	35
Pump voltage (V)	230 V
Dimensions H x W x D (cm)	77x71x41
Pump head (m)	35
Weight	7 kg
Code	PR_38722
Brand	AQUA OLA

The maximum flow rate of 35 l/min and head of 35 m determine the suitability of this unit for small to medium water distribution systems. The 50 L pressure tank helps maintain consistent pressure and reduces wear on the pump. The 230 V AC power supply requires a dedicated electrical circuit with proper grounding. The 1 m inlet cable length should be considered when planning the electrical installation to avoid unnecessary extensions or junctions.

Installation and connection

The installation process begins with positioning the unit close to the water source and ensuring a stable, level base. The suction line should be connected using a flexible hose with a 60 cm length and a right-angle elbow to reduce stress on the fittings. All connections must be checked for tightness to prevent air ingress, which can cause priming issues. The discharge side connects to the household plumbing system via standard threaded fittings.

• Verify the suction depth does not exceed 8 m to ensure efficient self-priming.
• Use non-return valves on the suction and discharge lines to prevent backflow and pressure loss.
• Ensure the electrical supply is protected by a residual current device (RCD) for safety.
• Avoid sharp bends or kinks in the suction line to maintain flow efficiency.
• Mount the unit securely to prevent vibration-related damage.

Compatibility and accessories

This system is compatible with standard domestic plumbing systems using copper, PEX, or polyethylene piping. Additional accessories such as filters, expansion vessels, or pressure regulators may be required depending on the water quality and system design. A non-return valve and pressure gauge are recommended for monitoring performance and preventing system failures. No related products are listed for this unit, but the installation should be verified for compatibility with local water supply regulations.

Technical background for designers

The WZI 250 pump operates on a centrifugal principle, using an electric motor to drive an impeller that generates pressure and flow. The pressure tank stores water under pressure and acts as a buffer to reduce pump cycling. The pump body is constructed from materials suitable for general water supply applications, though stainless steel variants are recommended for aggressive or chemically treated water. The system integrates into existing water networks via standard threaded connections and requires minimal space due to its compact design.

The efficiency and service life of the unit depend on the water quality, correct installation, and regular inspection of the pressure tank and pump seals. The 50 L tank volume determines the system’s ability to handle short-term fluctuations in demand. The pump is not suitable for deep wells or high-pressure applications beyond the stated parameters. The 35 m head capacity is achieved through the pump’s internal impeller and housing design.

Service and operation

Regular checks should be performed to ensure the pressure tank maintains the correct air charge and the pump operates without unusual noise or vibration. The system requires no scheduled maintenance beyond these inspections. If the pump fails to prime or shows signs of reduced flow, the suction line should be inspected for blockages or leaks. The pressure tank should be checked for waterlogging and drained if necessary. No specific service intervals are provided in the technical data.

Frequently asked questions

Can the WZI 250 / 50L unit be used for well water with sand content?
No, the unit is not designed for water with high particulate content. Sand or sediment can cause premature wear on the pump and pressure tank.

Is it possible to connect the pump to a solar power system?
No, the unit requires a 230 V AC supply and is not compatible with solar power systems without additional conversion equipment.

Can the pressure tank be replaced with a larger size?
Yes, a larger tank can be used to increase the system’s storage capacity and reduce pump cycling, but the pump must remain compatible with the new tank’s specifications.

What is the maximum number of people this system can supply?
The system is suitable for up to six people, based on average domestic water usage and the 35 l/min flow rate.