Dolphin Series 500 Bar Electric Pressure Washer 15 kW

Dolphin Series Electric Pressure Washer Overview (DP2235, DP1850+, DP2250)

The Dolphin Series is a family of 15 kW 440V 60Hz three-phase 500 bar electric pressure washers built by WINGSPAN TECH of Taizhou, Zhejiang, China. It is offered in three models – DP2235, DP1850+ and DP2250 – all sharing the same 15 kW 440V 60Hz motor running at 1740 rpm, a stainless steel trolley frame (1000 x 600 x 1000 mm, 180 kg net weight) and a 15 m high-pressure outlet hose. The models differ in pressure and flow: the DP2235 delivers 350 bar at 22 L/min, the DP1850+ delivers 500 bar at 18 L/min, and the DP2250 delivers 500 bar at 22 L/min. This page concentrates on the 500 bar DP1850+ and DP2250, with the full three-model comparison in the specifications table below. Operators comparing electric units can review the broader electric high pressure washer range in the same category.

Why Choose a 15 kW 440V Electric Unit

Unlike a single-phase 220V pressure washer, the Dolphin Series is built for continuous industrial duty on a proper three-phase supply. The 15 kW motor and 1740 rpm speed deliver steady hydraulic output without the heat and wear of under-sized consumer machines. All three models sit in the three-phase electric pressure washer class and are intended for trained operators rather than home use.

DP1850+ – 500 Bar with the Hawk HCPX1550 Pump

The DP1850+ is the flagship 500 bar electric pressure washer in the Dolphin Series and is built around the Hawk HCPX1550 triplex plunger pump head. At 18 L/min (4.8 GPM) it converts exactly 15.0 kW of hydraulic power, which matches the 15 kW motor rating. A pressure-regulating valve lets the operator dial pressure down for delicate surfaces, and the heavy-duty Hawk HCPX1550 pump head is suited to sustained industrial duty. Buyers who need the same 500 bar class at a higher flow can step up to the 500 bar high pressure cleaner or the DP2250 variant covered later on this page.

Hawk HCPX1550 Pump Head

The HCPX1550 is a Hawk triplex plunger pump head with brass fittings and a black unloader-regulator knob, mounted on the stainless pump body with a round pressure gauge. A transparent water inlet filter with a blue cap protects the plungers before water reaches the high-pressure side. Contractors comparing pump types can also review the stainless steel pumps offered by the same brand.

Custom Pump and Flow Configurations

WINGSPAN TECH accepts custom builds on the Dolphin Series. Beyond the standard Hawk HCPX1550 (fitted to the DP1850+) and DSP pump heads (fitted to the DP2235 and DP2250), the unit can be configured with AR (Annovi Reverberi), INTERPUMP or HAWK pumps, and with flow rates of 15, 18 or 22 L/min to suit the job – from light rinsing to heavy descaling. Buyers should specify the preferred pump brand and target flow when ordering; the sales team confirms lead time and pricing through the contact page. This flexibility is what places the Dolphin Series among configurable high pressure pumps rather than fixed-spec skids.

Construction and Key Components

The Dolphin Series is assembled on a stainless steel trolley frame with pneumatic wheels, so it can be rolled between work bays or loaded onto a service vehicle. The red electric motor, triplex pump and red control box are carried on a red steel base deck inside a polished roll-cage that protects the plumbing during transport. The front three-quarter view above shows how the pump, motor and control panel sit together on the mobile frame. The control box carries a display, start and stop buttons and an emergency stop, matching the FOWWA ESC2350 440V intelligent cleaner convention used across the 440V range. Note that the series has no autoswitch, so the motor is started and stopped from the control box.

Triplex Plunger Pump and Pressure Control

The pump is a stainless steel head triplex plunger pump regulated by a black unloader valve and monitored by a pump-mounted pressure gauge. The pressure-regulating valve (fitted to all three models) lets the operator set working pressure below the maximum, which protects surfaces and extends seal life. Operators running at 500 bar should pair the unit with the correct high pressure nozzles and high pressure hose from the accessories range.

Stainless Steel Trolley Frame

The frame is polished stainless tubing that forms both a roll cage and a push handle. Large pneumatic wheels and a red base deck keep the 15 kW motor and pump stable on uneven ground. At 180 kg net weight the unit is mobile on site but should be loaded with care; this mobile layout is the main difference between the Dolphin Series and a fixed pump skid.

Technical Specifications

The table below lists the confirmed specifications for all three Dolphin Series models. Items are taken from the manufacturer’s published data sheet; values are identical across the range except where the model differs in pressure, flow and pump head.

Standard Configuration

Every Dolphin Series unit ships with the components shown in the rear view and listed below. The rear three-quarter photo makes the WINGSPAN TECH nameplate and the power cord inlet visible on the red housing. The standard package includes a shut-off high pressure gun, a 15 m high-pressure outlet hose, a 3 m inlet hose, a water filter, four nozzle tips, a pump-mounted pressure gauge and the red control box on the stainless trolley. Replacement parts are available through the pressure washer accessories category.

Standard Accessories (Gun, Hose and Nozzles)

The shut-off gun stops flow the moment the trigger is released, which reduces operator fatigue on long jobs. The 15 m outlet hose reaches around vehicles and plant, while the 3 m inlet hose connects to the site water supply through the transparent filter. Four nozzle tips cover common spray patterns from a narrow jet to a wide fan, so the unit can move between descaling and rinsing without extra purchases. The same accessories appear across the water blaster class.

Applications and Selection

Choosing the right pressure class protects both the surface and the budget. The Dolphin Series fits heavy industrial cleaning where a lower-pressure machine would stall, but it is over-specified for light tasks. Matching the model to the job is the first step in any high pressure cleaner purchase.

Jobs Suited to 500 Bar

At 500 bar the DP1850+ and DP2250 strip paint, clean heat exchangers, descale pipes and wash building facades and ship hulls. Marine and construction crews use them where grit blasting is impractical. The same pressure class appears in the 1000 bar water blaster for even heavier duty, and the mobile frame makes the Dolphin Series practical on site.

When a Lower-Pressure Unit Is the Better Choice

For vehicle washing, small workshops or residential use, a 500 bar electric pressure washer risks surface damage and wastes power. The 350 bar DP2235 is the lighter option in this series, and a single-phase 220V pressure washer or a hot water pressure washer is usually the right call for lighter work.

Frequently Asked Questions

What models are in the Dolphin Series?
Three: the DP2235 (350 bar / 22 L/min), the DP1850+ (500 bar / 18 L/min, Hawk HCPX1550 pump) and the DP2250 (500 bar / 22 L/min). All share a 15 kW 440V 60Hz motor and a 180 kg stainless trolley.

What pump does the DP1850+ use?
The DP1850+ is built around the Hawk HCPX1550 triplex plunger pump head. The DP2235 and DP2250 use DSP pump heads. WINGSPAN TECH also offers custom builds with AR (Annovi Reverberi), INTERPUMP or HAWK pumps.

What power supply does it require?
It requires 15 kW 440V 60Hz three-phase power. It is not compatible with a 220V single-phase domestic outlet and must be installed by a licensed electrician.

Can the Dolphin Series be customized?
Yes. Beyond the standard pump heads, the unit can be configured with AR, INTERPUMP or HAWK pumps and with flow rates of 15, 18 or 22 L/min to match the application. Specify pump brand and flow when ordering.

What is included in the standard package?
A shut-off high pressure gun, 15 m outlet hose, 3 m inlet hose, water filter, four nozzle tips, pump-mounted pressure gauge and red control box, all on the 180 kg stainless trolley.

Is the Dolphin Series suitable for car washing?
The 500 bar electric pressure washer models are over-specified for cars and can damage paint. The 350 bar DP2235 is safer for light work, and a lower-pressure single-phase unit is the better choice for vehicle washing.

Can the unit be moved between sites?
Yes. It is mounted on a stainless steel trolley frame with pneumatic wheels and a push handle. At 180 kg it is mobile on site but should be loaded with care.