The oil pump, part #PH6398849.H12, can be purchased through our sister company, Jacks Small Engines. Please visit www.JacksSmallEngines.com for pricing and availability.
Powerhorse Gas Hot Water Pressure Washer with Diesel Heater, 4000 PSI, 4 GPM, Senci Engine

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Shipping:
Backordered: Order now to reserve yours -
Estimated to ship 06/22/26Heavy/large item. Lift gate service available.
Store Pickup:
Out of stock at Fredericksburg VA
- Heavy-Duty Cleaning Power: Powerful 4,000 PSI and 4 GPM output delivers commercial-duty cleaning performance
- Hot Water Performance: Diesel-powered burner heats water up to 212°F for faster grease and grime removal
- Adjustable Heat Control: Adjustable thermostat allows water temperature settings from 100°–212°F
- Reliable Engine Performance: Dependable 459cc Senci gasoline engine with electric and recoil start capability
- Commercial-Grade Pump: Triplex pump with ceramic-coated plungers for durability and long service life
See full description
Description
Key Specs
Reviews
Q & A
Warranty
Compare
Product Summary
What's Included
- (1) Powerhorse Hot Water Pressure Washer with Senci Engine (1) Lance (1) Spray gun (5) Quick-connect nozzles (1) 49.2ft. dual-layer hose (1) Spark plug wrench

Features + Benefits
- Heavy-Duty Cleaning Power: Powerful 4,000 PSI and 4 GPM output delivers commercial-duty cleaning performance
- Hot Water Performance: Diesel-powered burner heats water up to 212°F for faster grease and grime removal
- Adjustable Heat Control: Adjustable thermostat allows water temperature settings from 100°–212°F
- Reliable Engine Performance: Dependable 459cc Senci gasoline engine with electric and recoil start capability
- Commercial-Grade Pump: Triplex pump with ceramic-coated plungers for durability and long service life
- Extended Pump Life: Belt-drive pump system helps reduce vibration and wear
- Heavy-Duty Construction: Rugged stainless steel and powder-coated steel frame built for demanding use
- Built-In Safety Protections: Features low-oil shutdown, water shortage protection, flame detection monitoring, thermal overload protection and a trigger safety lock
- Portable Design: Pneumatic tires and cart-style frame improve mobility around jobsites
- Complete Accessory Package: Includes 49.2ft. dual-layer high-pressure hose, spray gun, lance and 5 quick-connect nozzles
Key Specs
| Attribute | Specification |
|---|---|
item# | 6398849 |
Brand | Powerhorse |
Manufacturer's Warranty | 1 year limited warranty |
Ship Weight | 407.0 LB |
Pressure | 4,000 PSI |
Flow | 4 GPM |
Engine Brand | Senci |
Engine Model | SV460 |
Engine Displacement | 459 cc |
Fuel Type | Gasoline |
Pump | Triplex pump with relief valve and ceramic sprayed surface plunger |
Drive Style | Belt |
Number of Tips Included | 4 |
Adjustable Pressure | Yes |
| Attribute | Specification |
|---|---|
Start Type | Electric and Recoil |
Engine Oil Included | No |
Engine Oil Type | 10w-30 |
Fuel Capacity | 1.85 Gal |
Chemical Injector | No |
Hose Length | 49.2 ft |
Nozzle Type | 0° 15°, 25°, 40° and Soap |
Quick Connect Nozzle | Yes |
Pump Oil Included | Yes |
Pump Oil Type | Yes (15w-30) |
Low Oil Shutdown | Yes |
Thermal Protector | No |
Product Weight | 392.4000 lb |
Dimensions L x W x H (in.) | 36.8 x 40.0 x 33.4 in |
Reviews
Questions & Answers
Questions
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· a month ago
I’m looking for the parts diagram. Those pages are missing from the manual . I need the oil pump for 6398849
1 answer-
PowerhorseExpert12· 20 days ago
Helpful?
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· a month ago
Is the burn temp control in Celsius or Fahrenheit?
1 answer-
PowerhorseExpert12· 21 days ago
The original version of this pressure washer used a temperature control calibrated in Celsius. However, a later revision changed the control to Fahrenheit.
Helpful?
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· 2 months ago
DOES THIS HAVE AN HOUR METER ON IT ?
1 answer-
PowerhorseExpert12· 2 months ago
This pressure washer is not equipped with an hour meter.
Helpful?
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· 2 months ago
Can this machine suck up chemical and dispense it through the wand?
1 answer-
PowerhorseExpert12· 2 months ago
This machine is equipped with a chemical injector to dispense detergent through the wand.
Helpful?
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· 2 months ago
Is this electric start or pull start?
1 answer-
PowerhorseExpert12· 2 months ago
This pressure washer features an electric starter with a recoil (pull-start) backup.
Helpful?
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· 2 months ago
What kind of packaging is this item shipped in
1 answer-
PowerhorseExpert12· 2 months ago
The item is shipped on its own pallet and enclosed in a large cardboard box. It is secured on all four sides with plastic straps and wrapped in plastic for added protection.
Helpful?
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· 3 months ago
What is the warranty? Online says 3 yr, the Manual says 1 yr
1 answer-
PowerhorseExpert12· 3 months ago
This pressure washer is backed by a 3-year limited warranty for residential use. When used in a commercial or professional setting, the limited warranty coverage is 1 year.
Helpful?
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· 3 months ago
Does this have an unloader valve/ if not can one be added?
1 answer-
PowerhorseExpert12· 3 months ago
This machine is equipped with an unloader valve that regulates the pressure.
Helpful?
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· 3 months ago
Is this only hot water or can it be used as cold water too?
1 answer-
PowerhorseExpert12· 3 months ago
This pressure washer can operate without the burner running.
Helpful?
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· 4 months ago
Does it have a soap dispenser hosr
1 answer-
PowerhorseExpert12· 2 months ago
This pressure washer does not include a hose for the chemical injector.
Helpful?
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Warranty
Manufacturer's Warranty
1 year limited warranty
Extend Your Warranty Coverage with a Northern Protection Plan (NPP)
Repair Plan — 1 Year
A Northern Protection Plan is available after adding the product to your shopping cart.
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Item # 6398849
$2999.99Shipping:
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Estimated to ship 06/22/26Heavy/large item. Lift gate service available.
Store Pickup:
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Item # 157116
$5299.99Shipping:
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Item # 157598
$7999.99Reg $8999.99Save $1000.00Order today to get this price.
Shipping:
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Store Pickup:
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Item # 157594
$5799.99Shipping:
Free shipping (lower 48 states) - Available nowHeavy/large item. Lift gate service available.
Store Pickup:
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Specifications
4,000 PSI
3,000 PSI
4,000 PSI
4,000 PSI
4 GPM
4 GPM
7 GPM
4 GPM
Senci
Honda
-
-
SV460
GX390
Command Pro V-twin
GX630 V-twin
459 cc
389 cc
725 cc
630 cc
Gasoline
Gasoline
Gasoline
Gasoline
Triplex pump with relief valve and ceramic sprayed surface plunger
CAT 66dx
Northstar
CAT 66dx
Belt
Direct
Belt
Direct
4
4
-
-
Yes
Yes
Yes
Yes
Electric and Recoil
Recoil
-
-
No
No
No
No
10w-30
SAE 30 Motor Oil
SAE 30 Motor Oil
SAE 30 Motor Oil
1.85 Gal
1.61 Gal
15 Gal
4 Gal
No
Yes
Yes
Yes
49.2 ft
50 ft
50 ft
50 ft
0° 15°, 25°, 40° and Soap
15° Wet Steam, 15°, 25°, 40°, and Chemical
0°, 15°, 25°, 40° and Soap
0°, 15°, 25°, 40° and Soap
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes (15w-30)
SAE 30 Nondetergent
Universal Tractor Transmission
SAE 30 Nondetergent
Yes
Yes
Yes
Yes
No
Yes
Yes
Yes
392.4000 lb
610.0000 lb
800.0000 lb
500.0000 lb
36.8 x 40.0 x 33.4 in
47.5 x 61.5 x 47.875 in
45.5 x 54.25 x 46.25 in
47.0 x 37.5 x 42.0 in
-
18.5 ft-lbs.
38.4 ft-lbs.
29.2 ft-lbs.
-
140 °F
140 °F
140 °F
-
250 °F
200 °F
210 °F
-
4.5
3.5
4
-
3/8 in
3/8 in
3/8 in
See All Gas-Hot Water Pressure Washers
See All Powerhorse Gas-Hot Water Pressure Washers
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