UNILIFT KP 250 A-1 Submersible Wastewater Pump

The Grundfos UNILIFT KP 250 A-1 is a compact, robust stainless-steel submersible drainage and wastewater pump designed for efficient removal and transfer of non-aggressive water, grey water, drainage water and similar liquids.

With its compact design, semi-open impeller and automatic float-switch operation, the UNILIFT KP 250 A-1 is well suited to drainage applications in residential, commercial and light industrial environments. The pump can be used for applications such as sump drainage, groundwater removal, rainwater drainage, flooded areas, tanks and other situations where reliable water removal is required.

For customers looking for a Grundfos submersible wastewater pump in South Africa, the UNILIFT KP 250 A-1 provides a practical solution where compact dimensions, stainless-steel construction and automatic operation are important.

Why Choose the Grundfos UNILIFT KP 250 A-1?

The UNILIFT KP 250 A-1 combines a compact stainless-steel construction with a semi-open impeller designed to handle particles up to 10 mm. The automatic float switch allows the pump to start and stop according to the water level, making it suitable for applications where automatic drainage is required.

Key benefits include:

• Compact stainless-steel submersible pump design
• Automatic operation with integrated float switch
• Semi-open impeller
• Maximum particle size of 10 mm
• Maximum flow rate of approximately 3.11 L/s
• Maximum pump head of 7.5 m
• 230–240 V single-phase electrical supply
• 50 Hz operating frequency
• IP68 enclosure protection
• Thermal motor protection
• 1¼-inch pump outlet
• Suitable for portable or stationary drainage applications
• Suitable for use inside or outside buildings, subject to installation requirements

The UNILIFT KP range is specifically positioned by Grundfos as a compact stainless-steel drainage pump for narrow pits and sumps, with the KP range supporting particles up to 10 mm.

UNILIFT KP 250 A-1 Applications

The Grundfos KP 250 A-1 submersible pump can be used for a variety of drainage and water-transfer applications.

Typical applications include:

Sump and Pit Drainage

Use the UNILIFT KP 250 A-1 for removing accumulated water from sumps, pits and drainage areas where automatic pumping is required.

Groundwater and Rainwater Removal

The pump is suitable for transferring groundwater, surface water and rainwater in appropriate drainage installations.

Floodwater and Emergency Drainage

Its compact submersible design makes the pump useful for removing unwanted water from flooded areas, basements, garages and similar locations.

Tank and Container Emptying

The UNILIFT KP 250 A-1 can be used for transferring or removing water from tanks and containers where the pumped liquid falls within the pump's specifications.

Domestic and Commercial Drainage

The pump is suitable for a variety of domestic, commercial and light-duty drainage applications where an automatic submersible pump is required.

Technical Specifications – UNILIFT KP 250 A-1

Specifications should always be checked against the exact product variant, product number and current manufacturer's documentation before installation or ordering. Grundfos documentation identifies the KP 250 A-1 automatic model and its technical characteristics, including the 230–240 V/50 Hz version.

Stainless-Steel Construction

The UNILIFT KP 250 A-1 features stainless-steel construction, providing a durable solution for suitable drainage and water-transfer applications.

The pump housing and impeller are manufactured from stainless steel, while the semi-open impeller allows the pump to handle particles up to 10 mm.

Automatic Float-Switch Operation

One of the main advantages of the UNILIFT KP 250 A-1 is its automatic level control.

The integrated float switch responds to the surrounding water level, allowing the pump to operate automatically when connected and installed correctly. This makes it particularly useful for sumps, pits and drainage areas where water levels can fluctuate without an operator being present.

The UNILIFT KP type designation uses A to indicate automatic operation with a float switch, while the M version is the manual variant without a level switch.

10 mm Particle Handling

The UNILIFT KP 250 A-1 has a maximum particle size of 10 mm.

This makes it appropriate for many drainage and grey-water applications, but it should not be treated as a heavy-duty sewage or solids-handling pump. For applications involving larger solids, raw sewage or demanding wastewater conditions, a different pump range may be more appropriate.

Grundfos identifies UNILIFT KP as a compact stainless-steel drainage pump for non-aggressive water and grey water, while other UNILIFT ranges are available for higher solids handling.

Where Can the UNILIFT KP 250 A-1 Be Used?

Depending on the installation and pumped liquid, common applications include:

• Sump drainage
• Pit drainage
• Basement drainage
• Rainwater removal
• Groundwater drainage
• Floodwater removal
• Tank emptying
• Container drainage
• Domestic drainage
• Commercial drainage
• Grey-water transfer
• General water transfer applications

The exact suitability of the pump depends on the liquid, temperature, solids content, required flow, total head and installation conditions.

Is the UNILIFT KP 250 A-1 Suitable for Sewage?

The term "wastewater pump" is often used broadly, but UNILIFT KP 250 A-1 should not automatically be considered a raw sewage pump.

The KP range is designed for drainage and non-aggressive water/grey-water applications and has a maximum particle size of 10 mm. If your application involves toilets, raw sewage, large solids, fibrous material or demanding municipal wastewater, contact a pump specialist to select the appropriate Grundfos wastewater pump. Grundfos offers dedicated wastewater ranges for more demanding applications.

UNILIFT KP 250 A-1 for South African Applications

The UNILIFT KP 250 A-1 is a useful option for drainage and water-removal applications in South Africa where a compact automatic submersible pump is required.

It can be considered for applications in homes, commercial properties, agricultural environments, workshops, facilities and other locations where water needs to be removed from a sump, pit, tank or drainage area.

For South African installations, confirm the exact electrical specification, pump duty point, installation depth, discharge arrangement and pumped-liquid characteristics before ordering.

How to Select the Correct Submersible Pump

Choosing a submersible wastewater or drainage pump should be based on more than the pump's maximum flow rate.

Before purchasing a UNILIFT KP 250 A-1, consider:

1. What type of liquid needs to be pumped?
2. What is the required flow rate in litres per minute or litres per second?
3. What is the total pumping head?
4. How high does the water need to be lifted?
5. What is the required discharge pipe size?
6. What size particles are present in the liquid?
7. Is automatic float-switch operation required?
8. What is the installation depth?
9. What electrical supply is available?
10. Will the pump be portable or permanently installed?

Correct pump selection should be based on the actual system duty point rather than maximum advertised flow or maximum head alone.

UNILIFT KP 250 A-1 FAQ

What is the Grundfos UNILIFT KP 250 A-1?

The Grundfos UNILIFT KP 250 A-1 is a compact stainless-steel automatic submersible drainage pump designed for suitable non-aggressive water and grey-water applications. It features a semi-open impeller and automatic float-switch operation.

Is the UNILIFT KP 250 A-1 a wastewater pump?

The UNILIFT KP 250 A-1 is a submersible drainage pump suitable for certain wastewater and grey-water applications. It is not intended to replace heavy-duty sewage pumps designed for raw sewage and larger solids.

What is the maximum flow rate of the UNILIFT KP 250 A-1?

The published 230–240 V, 50 Hz specification gives a maximum flow rate of approximately 3.11 litres per second. Actual flow depends on the total system head and installation conditions.

What is the maximum head of the UNILIFT KP 250 A-1?

The maximum published pump head is 7.5 metres for the 230–240 V, 50 Hz version. The actual operating head and flow should be determined from the pump performance curve and system requirements.

What size particles can the UNILIFT KP 250 A-1 handle?

The maximum particle size for the UNILIFT KP range is 10 mm.

Does the UNILIFT KP 250 A-1 have a float switch?

Yes. The A designation indicates automatic operation with a float switch.

Is the UNILIFT KP 250 A-1 automatic?

Yes. The KP 250 A-1 is the automatic version of the KP 250 pump and uses a float switch for level control.

What voltage does the UNILIFT KP 250 A-1 use?

The South African/European-style specification for this model is 230–240 V, single phase, 50 Hz. Always verify the nameplate and exact product number before connecting the pump.

Is the UNILIFT KP 250 A-1 single phase?

Yes. The model designation indicates a single-phase motor, and the applicable 230–240 V version is rated for single-phase electrical supply.

Is the UNILIFT KP 250 A-1 stainless steel?

Yes. The pump housing and impeller are specified as stainless steel.

Is the UNILIFT KP 250 A-1 suitable for dirty water?

It can be suitable for appropriate drainage and grey-water applications. However, the maximum particle size is 10 mm, so heavily contaminated wastewater, raw sewage or wastewater containing large solids may require a different pump.

Can the UNILIFT KP 250 A-1 pump rainwater?

Yes, the pump is suitable for appropriate rainwater and drainage applications, provided the liquid and installation conditions comply with the manufacturer's specifications.

Can the UNILIFT KP 250 A-1 pump groundwater?

Yes. The UNILIFT KP design is suitable for appropriate groundwater and drainage applications.

Can the UNILIFT KP 250 A-1 be used for sump drainage?

Yes. Sump and pit drainage are common applications for compact UNILIFT KP drainage pumps.

What is the outlet size on the UNILIFT KP 250 A-1?

The published specification lists a Rp 1¼-inch pump outlet. Confirm the exact connection type before purchasing fittings.

Is the UNILIFT KP 250 A-1 IP68 rated?

Yes. The published specification lists an IP68 enclosure class.

What is the difference between UNILIFT KP 250 A-1 and KP 250 M-1?

The key difference is the level-control arrangement. The A-1 version is designed for automatic operation with a float switch, while the M-1 version is the manual variant without a level switch.

How deep can the UNILIFT KP 250 A-1 be installed?

The published 230–240 V product data specifies a maximum installation depth of 2 metres. Always follow the current installation and operating instructions for the exact product variant.

What is the cable length of the UNILIFT KP 250 A-1?

The 230–240 V specification lists a 5 metre cable. Product variants can differ, so confirm the exact product number when ordering.

Is the UNILIFT KP 250 A-1 suitable for domestic drainage?

Yes, it can be suitable for domestic drainage applications such as sump, rainwater and other appropriate water-removal duties.

Where can I buy a UNILIFT KP 250 A-1 in South Africa?

Availability, pricing and lead times can vary. When purchasing, confirm that the supplier is providing the correct Grundfos UNILIFT KP 250 A-1, including the correct voltage, frequency, product number and accessories for your installation.

How do I choose between a UNILIFT KP 250 A-1 and another Grundfos wastewater pump?

The correct choice depends on the liquid being pumped, required flow, total head, particle size, installation method and application. UNILIFT KP is intended for compact drainage and suitable grey-water applications, while Grundfos has other pump ranges designed for higher solids and more demanding wastewater duties.