DOYIN 4SDM3/18 1.5HP Single-Phase AC Submersible Pump — 1.25" Outlet

The DOYIN 4SDM3/18 is a dependable 1.5HP single-phase AC submersible pump with an ordinary impeller, built for deep wells and boreholes. With a 1.25-inch outlet and a flow rate of 4.8m³/h (4,800 litres per hour), it delivers solid lifting capacity — rated for a recommended depth of up to 109 metres, with a maximum head of 122M, making it well suited to deep domestic and small farm wells.

Running on standard single-phase AC power, the 4SDM3/18 is a practical option for properties without three-phase supply — common across many residential and small commercial sites in coastal Kenya. It fits deep domestic wells, household water points, and small farm water supply needs in Mombasa, Malindi, Diani, Kilifi, and Lamu.

As a single-phase AC pump, the 4SDM3/18 requires a matching AC controller (DOYIN's DYM-S03 unit) sized to its 1.5HP rating for correct, protected operation. It is not solar-compatible in this configuration and is best suited to properties with stable single-phase grid or generator power.

CoastalSolar Africa supplies, sizes, and installs the 4SDM3/18 pump, including the correctly matched DYM-S03 controller, across the coastal region.

Specifications:

• Model: 4SDM3/18
• Power: 1.5HP, single-phase AC
• Impeller: Ordinary
• Outlet size: 1.25 inches
• Max flow: 4.8m³/h (4,800L/h)
• Max head: 122M
• Recommended depth: 0–109M
• Power source: Single-phase AC (grid or generator)
• Required controller: DOYIN DYM-S03 AC controller
• Application: Deep domestic wells, household water points, small farm water supply

FAQs:

Does this pump run on solar power?
No — the 4SDM3/18 is a single-phase AC pump requiring standard grid or generator power. For solar-powered options, ask about DOYIN's DC or hybrid AD pump range.

What controller does this pump need?
It requires the DOYIN DYM-S03 AC controller, specifically matched to this model — CoastalSolar Africa can supply and fit this correctly.

How does this compare to the 4SDM3/22 (2HP)?
Both use the same DYM-S03 controller, but the 4SDM3/22 reaches greater depth (141M vs 109M recommended) at a higher 2HP rating — the 4SDM3/18 is the more economical choice where 109M depth is sufficient.

Do you install this pump in Kilifi and Malindi?
Yes, CoastalSolar Africa supplies and installs the 4SDM3/18 pump with its matched controller across Mombasa, Malindi, Diani, Kilifi, Lamu, and the wider coastal region.