Electric Water Pumps
Why Replace a Mechanical Water Pump?
The traditional mechanical water pump is one of the last remaining belt-driven components on modern engines — a legacy design carried over from the earliest automotive technology. While reliable, it is inherently inefficient.
A mechanical pump runs at engine speed, regardless of actual cooling demand.
-
Highway driving: Engine RPM is high, but natural ram-air provides significant cooling. The mechanical pump continues spinning fast, delivering excessive coolant flow while unnecessarily consuming engine power.
-
Heavy traffic & high ambient temperatures: Engine RPM is low, yet cooling demand is high. Unfortunately, the belt-driven pump is also turning slowly — precisely when increased coolant circulation is needed most.
In short, the mechanical water pump delivers maximum output when cooling demand is low, and minimum output when cooling demand is high.
The EWP® eliminates this inefficiency.
By operating independently of engine speed, the EWP® (Electric Water Pump) provides maximum cooling when it’s actually required — improving thermal control, reducing parasitic power loss, and increasing overall efficiency.
Intelligent Cooling with the EWP® & Fan Digital Controller
(12V & 24V Models | Patents: USA 6425353, EU 1133624, AUS 756453)
When paired with the EWP® & Fan Digital Controller, cooling becomes fully demand-based and temperature-controlled.
The controller:
-
Continuously monitors engine temperature
-
Modulates pump speed by varying supply voltage
-
Actively “hunts” and maintains a user-defined target temperature
-
Adjusts pump speed dynamically for traffic, throttle, and load conditions
-
Maintains stable engine temperature independent of engine RPM
Automatic Fan Management
If the EWP® alone cannot maintain the target temperature, the controller automatically activates the electric cooling fan once the engine exceeds:
+3°C (+5.4°F) above the set temperature
This ensures consistent thermal stability under extreme conditions.
After-Run Cooling (Heat Soak Protection)
To prevent damaging heat soak after shutdown, the controller allows the EWP® and fans to continue operating:
-
For up to 3 minutes, or
-
Until temperature drops 10°C (14°F) below the set point
This protects critical engine components and improves long-term reliability.
Expanding Beyond Internal Combustion
With the rapid growth of electric and hybrid vehicle systems, demand for precise thermal management has never been greater.
The EWP® is ideally suited for:
-
Lithium-ion battery pack cooling
-
Electric & hybrid drive systems
-
Closed-circuit condenser cooling
-
Chiller and A/C circulation systems
Controlled by a patented digital management system, the EWP® modulates coolant flow in response to selected temperatures — delivering optimal efficiency, precise thermal stability, and reduced energy consumption.
Smarter Cooling. Greater Efficiency. Complete Thermal Control.
The EWP® transforms cooling from a passive, engine-speed-dependent system into an intelligent, demand-driven solution engineered for modern performance and emerging technologies.
Benefits of an Electric Water Pump
Superior Temperature Control
The primary advantage of installing an EWP® (Electric Water Pump) is precise engine temperature management.
Unlike mechanical pumps that operate purely at engine speed, the EWP® delivers cooling based on actual demand. This helps resolve overheating issues while maintaining stable and consistent operating temperatures across all driving conditions.
Reclaim Lost Engine Power
A mechanical water pump is belt-driven, meaning it constantly draws power from the engine — even when full cooling capacity isn’t required.
By replacing it with an EWP®, you eliminate parasitic power losses and reclaim usable engine power.
The Result:
-
Increased horsepower
-
Improved torque
-
Better fuel efficiency
Mechanical pump power consumption increases exponentially with engine speed. In fact, power draw rises with the cube of pump speed:
-
Doubling speed from 600 RPM to 1200 RPM increases power consumption eightfold
-
Doubling again to 2400 RPM increases it another eight times
This escalating power drain continues all the way to maximum engine speed.
By removing the mechanical pump, that lost energy is returned to the drivetrain — delivering measurable performance gains.
Potential Gains:
-
Up to 10kW of additional power
-
Estimated 3.5%–10% fuel savings
Proven Efficiency
Major European vehicle manufacturers have adopted electric water pumps as standard equipment in select models — a testament to their efficiency and performance advantages.
Independent research shows that an EWP® can use up to 90% less energy than a conventional mechanical pump system.
Additional Advantages
Beyond performance and efficiency, the EWP® offers several long-term benefits:
-
Faster engine warm-up
-
Reduced emissions
-
Improved thermal stability
-
Elimination of engine heat soak
-
Extended engine life
Significant Weight Reduction
Weight savings are critical for both performance and fuel efficiency.
-
EWP® weight: 900g – 1,151g (model dependent)
-
Typical mechanical pump: 3kg – 5kg
Not only is the EWP® considerably lighter, but its universal and flexible mounting options also allow easier placement within crowded engine bays — freeing up space for additional performance modifications.
Upgrade to Intelligent Cooling
Replacing a mechanical water pump with an EWP® delivers:
-
Smarter cooling
-
More power
-
Better fuel efficiency
-
Lower emissions
-
Reduced weight
It’s a modern solution designed for performance, efficiency, and long-term reliability.
Choosing the Right EWP® for Your Engine
The size and cooling demands of your engine will determine the most suitable EWP® (Electric Water Pump) for your application.
Davies Craig’s patented range of Electric Water Pumps is available in multiple flow capacities to suit everything from daily drivers to high-performance and heavy-duty engines.
Available Flow Rates:
-
From 90 L/min (23.8 gal/min)
-
Up to 180 L/min (47.5 gal/min)
Models are available in both 12V and 24V configurations, with housing options in high-strength Nylon 66 or Alloy to suit different environments and performance requirements.
Designed for Universal Fitment
EWP® units are engineered for versatile installation. They can:
-
Replace an existing mechanical belt-driven water pump
-
Be installed inline to complement an existing system
-
Suit a wide range of vehicle types and engine configurations
With straightforward, DIY-friendly installation, upgrading to an electric water pump is simpler than ever.
Flexible Cooling Solutions for Every Application
Whether you’re building a street performance vehicle, motorsport application, marine setup, or heavy-duty cooling system, there’s an EWP® designed to deliver the right flow for your engine.
| EWP® SALES CONFIGURATION | ||
| EWP® Only | EWP® Kit | EWP® Combo |
|
The EWP® Pump-Only option is ideal for replacement, intercooler, charge cooler, or auxiliary water pump applications where wiring is already installed or custom-built. Perfect for seamless integration into performance, motorsport, or custom cooling systems. |
The EWP® Kit is a convenient, all-in-one solution for new electric water pump installations, particularly suited to intercooler and auxiliary cooling applications where simple on/off control is preferred. Each kit includes the essential components required to install and wire the EWP® into your system, making setup straightforward and hassle-free. |
The EWP® Combo Configuration is the ideal solution for a full electric water pump conversion. This setup allows you to remove or disengage the mechanical belt-driven water pump and, in most applications, eliminate the factory mechanical thermostat — delivering precise, fully controlled cooling system performance. By converting to an EWP® Combo system, you gain optimal temperature management, improved efficiency, and complete control over your engine’s cooling strategy. |
 |
 |
 |
| SPECIFICATION ELECTRIC WATER PUMP (EWP®) |
|||||||
|
EWP® Model |
EWP®80 | EWP®115 | EWP®140 | EWP®150 | Brushless EWP®160 |
Brushless EWP®180 |
|
| Open Flow Rate | 90 l/min 23.8 g/min |
139 l/min 36.7 g/min |
147 l/min 38.8 g/min |
162 l/min 42.8 g/min |
160 l/min 42.3 g/min |
180 l/min 47.6 g/min |
|
|
Body Material |
Aluminium | Nylon 66 or Aluminium | Aluminium | Aluminium | Aluminium | Aluminium | |
| Rated Voltage | 12V | 13.8V to 16V | 13.8V to 16V | 13.8V to 16V | 13.8V to 16V | 9V to 19V DC | 9V to 19V DC |
| 24V | N/A | 25.6V to 28V | 25.6V to 28V | 25.6V to 28V | N/A | 18V to 32V | |
| Rated Current | 12V | 7.5 A | 10 A | 10 A | 10 A | 26 A | 33 A |
| 24V | N/A | 5.5 A | 5.5 A | 5.5 A | N/A | 17 A | |
| Fluid Temp | -40°c to 120°c -40°F to 248°F |
||||||
| Weight | 900g (2lbs) Nylon 1025g (2.26lbs) Alloy |
920g (2.03lbs) Nylon 1101g (2.43lbs) Alloy |
1,226g 2.7lbs |
1,107g 2.6lbs |
2,013g 4.4lbs |
2,013g 4.4lbs |
|
| Inlet & Outlet Fitting |
Nylon | Flange with 35mm (1 3/8") Push on barb |
38mm (1 1/2") Push on barb |
N/A | N/A | N/A | N/A |
| Alloy | 35mm (1 3/8") Push on barb |
38mm (1 1/2") Push on barb with 16AN ORB Fitting |
Flange 38mm (1 1/2") Push on barb with 16AN ORB Fitting |
38mm (1 1/2") Push on barb with 16AN ORB Fitting |
|||
| Internal Thread Specification |
N/A | N/A Nylon 1 5/16 -12 UN Alloy |
1 5/16 -12 UN 1 5/16 -12 UN |
||||
| Hose Fitment | 32mm to 38mm 1¼” to 1½” |
35mm to 41mm (1⅜ to 1⅝") |
|||||
| Hose Fitmment with Sleeve |
3mm | 38mm to 44mm 1½” to 1.73" |
41mm to 47mm (1⅝" to 1⅞) |
||||
| 6mm | 44mm to 5mm 1.73” to 2.05" |
47mm to 54mm (1⅞ to 2 ⅛") |
|||||
| Part Number 12 Volt |
Pump | 8106 Flange 8109 Barb |
8125 Nylon 8140 Alloy |
8180 Alloy | 8160 Sliver 8165 Black |
N/A | N/A |
| Kit | 8006 Flange 8009 Barb |
8025 Nylon 8040 Alloy |
8080 Alloy | 8060 Silver 8065 Black |
8430 | 8450 | |
| Combo | 8908 Flange 8919 Barb |
8930 Nylon 8950 Alloy |
8990 Alloy | 8970 Silver 8975 Black |
N/A | N/A | |
| Part Number 24 Volt |
Pump | N/A | #8126 Nylon #8141 Alloy |
8181 Alloy | 8161 Silver | N/A | N/A |
| Kit | N/A | N/A | N/A | 8061 Silver | N/A | 8451 | |
| Combo | N/A | N/A | N/A | 8971 Silver | N/A | N/A | |
| PRODUCT SELECTION GUIDE by Part Number Electric Water Pump (EWP®) |
|||||||
| APPLICATION |
PUMP MODEL |
PUMP ONLY | PUMP KIT | PUMP COMBO | |||
| 12V | 24V | 12V | 24V | 12V | 24V | ||
| Engines up to 2.0L (Standard) |
EWP®80 | 8106 Flange 8109 Barb |
N/A | 8006 Flange 8009 Barb |
N/A | 8908 Flange 8919 Barb |
N/A |
| Engines up to 2.0L - 3.5L (Standard) |
EWP®115 | 8125 Nylon 8140 Alloy |
8126 Nylon 8141 Alloy |
8025 Nylon 8040 Alloy |
N/A | 8930 Nylon 8950 Alloy |
N/A |
| Engines up to 3.5L - 5.0L (Standard) |
EWP®140 | 8180 Alloy | 8181 Alloy | 8080 Alloy | N/A | 8990 Alloy | N/A |
| Engines 5.0L or greater (Standard) Modified Engines Supercharged/Turbo, Drag Racing, 4WD, Off Road, Drifting & Speedway |
EWP®150 | 8160 Sliver 8165 Black |
8161 Silver | 8060 Silver 8065 Black |
8061 Silver | 8970 Silver 8975 Black |
8971 Silver |
| Intercooler (depending on capacity) |
EWP®115 | 8125 Nylon 8140 Alloy |
8126 Nylon 8141 Alloy |
8025 Nylon 8040 Alloy |
N/A | 8930 Nylon 8950 Alloy |
N/A |
| EWP®140 | 8180 Alloy | 8181 Alloy | 8080 Alloy | N/A | 8990 Alloy | N/A | |
| EWP®150 | 8160 Sliver 8165 Black |
8161 Silver | 8060 Silver 8065 Black |
8061 Silver | 8970 Silver 8975 Black |
8971 Silver | |
| EWP®160 | N/A | N/A | 8430 | N/A | N/A | N/A | |
| EWP®180 | N/A | N/A | 8450 | 8451 | N/A | N/A | |
EWP® INSTALLATION OPTIONS
AUXILIARY OR REPLACEMENT
An EWP®, can be used as an auxiliary pump in addition to the existing belt driven mechanical water pump to significantly improve cooling or as a replacement water pump to again improve cooling while at the same time increasing power to the drive wheels and saving fuel.
As an auxiliary pump, about 4 inches of the lower radiator hose is removed, and the EWP® is inserted in the gap. The EWP® is then wired through a thermal switch, sometimes the same switch which operates electric radiator fans, and both the fans and EWP® are connected directly to the battery. In this set up, when the engine reaches the thermal switch cut in temp, both the fans and the EWP® will turn on and cool the engine, to the switch off temperature. When the engine is hot and idling, the mechanical pump will be moving coolant at about 15 litres per minute, while the EWP®150 will kick in with up to an extra 162 litres per minute, and so dump a huge amount of heat. If you upgrade from the switch to our digital controller being wired to the battery, on hot shut down, the fans and EWP® will run for about half a minute and wash out heat which will protect the head gasket and other components from excessive heat damage.
DISABILING THE MECHANICAL WATER PUMP
- Leaving the mechanical water pump in place, install the EWP® into the bottom radiator hose and remove the manufacturer’s thermostat.
- You will need to bypass the water pump pulley by installing an appropriate length belt. This method makes for an easy installation.
- If running the pump continuously, remove the thermostat and drill two approx. 3mm (1/8") holes in the thermostat plate to allow some coolant circulation. Re-install ensuring that the thermostat housing is clean and a new gasket is used if required.
DISENGAGED MECHANICAL WATER PUMP (RECOMMENDED)
- Remove the mechanical water pump and remove the thermostat.
- Then remove the impeller from the mechanical pump shaft. Retain the mechanical water pump using the pump pulley as an idler to avoid re-routing the drive belt.
- Block any bypass passages and re-install the disengaged water pump ensuring that all gasket surfaces are clean and the new gaskets are properly fitted to prevent leaks.
- Install the EWP® into the bottom radiator hose..
REMOVE MECHANICAL WATER PUMP (IDEAL)
- Remove the mechanical water pump and thermostat from the engine.
- Install a Davies Craig EWP® Block Adapter or blanking plate (not supplied). Ensuring the gasket surfaces are clean and the appropriate gasket or sealant is used to prevent leaks.
- Install the EWP® into the bottom radiator hose. This method will require you to modify or replace the standard radiator hose.
- Install an appropriate length belt (not supplied) to drive the accessories.
In most cases EWP® will be adequately supported by the radiator hose. Where mounting is required, the EWP® must be soft mounted to protect against vibration. For the EWP115, EWP140 and EWP150 Part #8700 & #8710 Mounting kits are recommended.
EWP & CONTROLLER INSTALLATION DEMONSTRATION
- Davies, Craig recommends using Glycol 50% in water for all EWP® & EBP.
- Recommended viscosity range for all EWP & EBP: 100 mPa·s @ -30°C to 1 mPa·s @ 100°C
HOW TO MANAGE YOUR ELECTRIC WATER PUMP
ELECTRIC WATER PUMP EWP® & FAN DIGITAL CONTROLLER
12 & 24 Volt | Part Number: #8002, #8102
Provides optimum control of Davies, Craig 12 / 24 Volt Brushed Motor Electric Water Pumps and Electric Fans. It Will manage the operation of the EWP® by varying the speed of the pump in response to the coolant temperature and manage control of your electric engine fan.
VARIABLE SPEED EWP® & FAN CONTROLLER
12 & 24 Volt | Part Number: #0550, 0551, 0555, 0556
Available for Brushed and Brushless Motor applications. High-performance Controller designed to optimise thermal management in automotive, industrial, marine and EV applications. It provides intelligent, precise control of either Brushless dual Thermatic® Electric Fans or Electric Water Pumps (EWP®), ensuring maximum, efficiency, system protection and reliable operation in the most demanding environments.
DIGITAL THERMATIC® EWP® & FAN SWITCHES
12 & 24 Volt | Part Number: #0444, 0445, 0448, 0435, 0438
Our very own designed Digital Thermatic® Fan Switch Kit can be used with our Thermatic Fans, EWP's and competitors Fans. This is a simple on / off switch that can run 1 or 2 fans and be used for 12 or 24 volt applications. It has an adjustable temperature range of 40ºC to 110ºC (104ºF to 230ºF) which can show Centigrade or Fahrenheit
EWP BLOCK ADAPTER KITS
EWP® Block Adapter Kits are simply designed to complement the fitment of your EWP® Combo Kit.
If you’ve purchased an EWP® Combo Kit, then you will have an LCD EWP®/Fan Digital Controller with a built-in switch that will thermatically control the new electric Thermatic® Fan in unison with your new EWP®. Simple, easy-to-follow installation instructions are supplied to ensure the Davies, Craig EWP® Electric Water Pump Combo and EWP® Block-Adapter Kits are simply designed to complement the fitment of your EWP® Combo Kit.
EWP® Block Adapter Kits are assembled, mounted and perform in accordance with the product’s design.
