Enough power to reach 2nd story of structure?

No, the K5 is a light duty home unit. In order to reach a 2nd story you need a more powerful unit (perhaps 2400 psi and 2 gpm). With a more powerful unit, you could then attach either a 10-ft extension or use a sharper nozzle (0-degree); the K5 does not accommodate either attachments.

Can this be used with an extension cord? I only have one outside outlet at the back of my house.

Every outlet in your house is essentially an extension cord. The longer the wire from the power company's transformer, the lower the voltage getting to your motor. If your outside outlet is at the far end (away from your main panel) of a large house, you may have used up all the distance your allowed. If the outlet is 10 feet from your main, you could put a 50 ft #14 extension cord on it no problem. If you have a bit extra voltage in your lines, say 122 instead of 114 you can get by with longer cords of smaller wire. What will burn up your motor is insufficient voltage, i.e. long, lightweight extension cords. So what's the answer? Find out your voltage at the outlet you will be using, the minimum voltage the pressure washer needs and use an online voltage calculator to determine the size wire and length you need in the cord. Sorry - it's not a yes or no answer :-(

How much does this weigh, please?

Hello from Karcher! The K 5 Premium weighs 32 pounds. Thank you for your question and I hope this helps, Karl from the Customer Care Team.

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Kärcher Pressure Washer K 5 Premium, 1.4 GPM with Hose Reel

Product ID: 25707855

Details

Brand
KÄRCHER
Color
Yellow
Global Trade Identification Number
Hose Length
25 feet
Item Weight
32 pounds
Maximum Flow Rate
1.4 gpm

⚡2000 PSI max pressure

💧1.4 GPM water flow

🧴Onboard detergent tank

¥202061

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Description

🚿 Clean smarter, not harder — unleash power and precision with Kärcher K5 Premium!

POWER MEETS PRECISION - 2000 PSI and 1.4 GPM deliver professional-grade cleaning power for every surface.
TAILORED SPRAY CONTROL - Vario Power and Dirtblaster wands let you switch from gentle rinses to deep cleans instantly.
BUILT TO LAST 5 X LONGER - Water-cooled brushless induction motor ensures durability and peak performance over time.
EFFORTLESS HOSE MANAGEMENT - 25' kink-resistant hose with onboard reel keeps your workspace tidy and ready to roll.
QUICK SETUP INSTANT RESULTS - Assembles in under 5 minutes so you can start transforming your space without delay.

The Kärcher K5 Premium Pressure Washer combines 2000 PSI of cleaning power with a 1.4 GPM flow rate, featuring a durable water-cooled brushless motor and a 25-foot kink-resistant hose with reel. Equipped with Vario Power and Dirtblaster wands plus an onboard detergent tank, it offers versatile, professional-grade cleaning for cars, patios, driveways, and more—all backed by a 2-year warranty and quick 5-minute setup.

Specifications

ASIN	B01BMETENG
Best Sellers Rank	#84,008 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #451 in Pressure Washers
Brand Name	KÄRCHER
Color	Yellow
Customer Reviews	4.0 4.0 out of 5 stars (1,861)
Global Trade Identification Number	00886622014522, 00886622015178
Hose Length	25 feet
Included Components	DirtBlaster wand, Hose, Pressure Washer, Vario Wand
Item Dimensions L x W x H	34.33"L x 13.07"W x 16.77"H
Item Type Name	K 5 Premium
Item Weight	32 pounds
Manufacturer	Karcher
Manufacturer Part Number	1.603-361.0
Manufacturer Warranty Description	Two year Limited Karcher Warranty
Maximum Flow Rate	1.4 gpm
Maximum Pressure	2000 psi
Model Number	1.603-361.0
Power Source	Electric
Specification Met	CSA
Tank Volume	1.4 gallons
UPC	886622015178 886622014522
Unit Count	1 Count

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¥202061

Duties & taxes included

In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Japan.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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