Optimize your water supply with our expert guide to sizing, selecting, and powering the ideal borehole pump for Malawian geological conditions.

META: How to select the right borehole pump for Malawi — submersible vs surface pump, sizing for yield and depth, and power supply considerations. | KEYWORDS: borehole pump Malawi, submersible pump Malawi, borehole water pump, water borehole equipment Malawi, pump for borehole Malawi

Borehole pumping is a critical water supply method for homes, farms, schools, clinics, and businesses across Malawi. Selecting the wrong pump — oversized for the borehole yield, undersized for the required head, or incompatible with the power supply — creates problems ranging from inadequate water delivery to borehole damage and premature pump failure. This guide provides the selection framework.

Submersible vs Surface Pumps

For borehole applications in Malawi, submersible pumps are almost always the correct choice for depths beyond 7 to 8 metres. A submersible pump sits in the water at the bottom of the borehole and pushes water upward — it can operate at any depth within its rated lift range. Surface pumps (centrifugal pumps at surface level) rely on suction to draw water up, which limits practical lift to 6 to 7 metres before the water cannot be drawn up reliably.

Critical Borehole Parameters for Pump Selection

Static Water Level

The depth to the water surface in the borehole when the pump is not running. This determines the minimum submersion depth of the pump.

Dynamic Water Level

The depth to the water surface when the pump is running at its rated flow rate. The dynamic level is always deeper than the static level — as water is pumped out, the level drops. The pump must be set below the dynamic water level to prevent running dry.

Borehole Yield

The sustained flow rate the borehole can deliver without the water level dropping below the pump intake. The pump's rated flow must not exceed the borehole yield — if it does, the borehole will be dewatered and the pump will run dry, causing seal failure.

Total Dynamic Head

Static water level + drawdown (static level minus dynamic level) + vertical lift to delivery point + friction losses in pipes. This is the head the pump must overcome. Select a pump rated for total dynamic head that exceeds your calculated value at your required flow rate.

Borehole Diameter

The internal diameter of the borehole casing limits the physical size of the submersible pump that can be installed. Confirm the casing internal diameter before selecting a pump — standard Malawian boreholes are typically 4-inch or 6-inch diameter.

Power Supply for Borehole Pumps

Electric submersible pumps require a reliable power supply. In areas with frequent load shedding, a submersible pump without backup power is available only when grid power is available. Options: generator backup with manual or automatic transfer, solar-powered borehole pumps (increasingly viable in Malawi's solar resources), or diesel surface pump as an alternative extraction method during outages.

Agason Motors supplies water pumps and pump accessories for borehole and surface water applications across Malawi. Our team can advise on pump selection and specifications for your specific borehole parameters.

Get the right borehole pump specification atagasonmotors.com | WhatsApp Us | agasonmotorsmw@gmail.com