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Franklin Sub Drive Inverter drive for Borehole Pumps

Franklin Sub Drive Inverter drive for Borehole Pumps

Franklin Electric’s constant pressure controllers use state-of-the-art technology to provide constant water pressure through variable speed control, specifically designed for submersible water well pumps.

►Constant water pressure with a wide range of pressure settings  
►Easy installations
►Soft start feature prevents water hammer and increases pump life
►Works with small pressure expansion tanks or existing larger tanks
►Smart reset® allows well recovery before restarting the pump
►Single-phase input power with three-phase motor performance
►Excellent radio frequency interference sheilding
►Built-in Diagnostics and Protection against: - Power serge
                                                                         - Dry run
                                                                         - Under voltage
                                                                         - Locked pump
                                                                         - Open circuit
                                                                         - Short circuit
                                                                         - Overheated controller
Your benefits
►Energy saving up to 70% over conventional systems
►Longer pumps life
►Smooth running
►No flunctuations in water pressure
►No need for large expansion tanks
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Delivery Costs

Delivery Map


Zone 1 England, Wales & Southern Scotland Under £100 Over £100
Standard 2/3 working days


Express Next working day


Premium Next working day (before 13.00)


Zone 2 Scottish Highlands & Islands, Northern Ireland, Isle of Man, Scilly & Channel Isles Under £100 Over £100
Standard 2/3 working days


Zone 3 Republic of Ireland Under £100 Over £100
Standard 3/5 working days




Orders must be placed before 14.00 for next day and premium next day delivery. 


Exporting Internationally

We offer a first class worldwide export service. Please contact us here for a price.
Model SKU Price ex-VAT Qty
SUB DRIVE 75 4039-000 £609.60
SUB DRIVE 100 4039-001 £732.80
SUB DRIVE 150 4039-002 £961.60
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Whisper Pumps Ltd, Leen Court, Boughton, Newark, Nottinghamshire, NG22 9ZD