Konner & Sohnen KS 4000iEHS CO - 3500/4000W Dual Fuel Inverter Generator With Electric Start
The Konner & Sohnen KS 4000iEHS CO is a compact dual fuel inverter generator with a rated wattage of 3,500 W and a starting wattage of 4,000 W. (Read full specs)
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Description
Zoom on the Konner & Sohnen KS 4000iEHS CO
In summary, the Konner & Sohnen KS 4000iEHS CO is a compact portable inverter generator especially useful for:
- RV travellers wishing to enhance their freedom and nomad lifestyle
- Occasional participants of outdoor events, competitions, concerts and festivals
- DIYers who wish to improve their efficiency with tools
- Homeowners who want to be able to use the most necessary devices in their household, even during a blackout
- Camping and tailgating hobbyists looking for a portable power source
In the sections ahead, the power characteristics, availability of various outlets, the portability, and any additional features of the device shall be discussed.
Power & Run Time
The Konner & Sohnen KS 4000iEHS CO
With its dual-fuel technology, the Konner & Sohnen KS 4000iEHS CO delivers 120V, and offers power and flexibility. Running on gasoline, it boasts a running wattage of 3,500W and a peak wattage of 4,000W. When powered by propane, it delivers 3,150 running watts and 3,600 peak watts. In addition, the parallel capability (parallel kit not included) empowers increasing of power output when linked to another similar or compatible unit, ensuring expanded energy capacity and reliability for various applications.
Konner & Sohnen’s smart fuel switching system automatically selects the fuel source (LPG or gasoline) depending on availability and prioritizes LPG. Thus, if a propane tank with enough LPG is connected, the generator will automatically use LPG. If no propane tank is connected, or if there is not enough LPG remaining in the tank, the generator will use gasoline.
Featuring a noise rating of 62 dBA (just slightly more noisy than an office), the inverter generator is equipped with both a traditional recoil pull-start mechanism and a convenient and efficient electric starter (battery included) for starting.
In terms of run time, the KS 4000iEHS CO, boasting a 3.2 gallons fuel tank, can run for around 7.8 hours at 50% load on a full tank of gasoline (with fuel consumption averaging 0.41 gallons per hour). Additionally, it provides around 8.6 hours (estimation based on a 20 lbs tank - propane consumption around 0.55 GPH) of operation with propane.
The <3% Total Harmonic Distortion (THD) of the KS 4000iEHS CO ensures a clean sine wave output, providing a secure power source for your sensitive electronics through its AC outlets.
Outlets
The control panel is equipped with the following 3 AC outlets:
Furthermore, it has 3 DC outlets: there's two 5V USB ports (USB-C) providing convenient charging capabilities for mobile phones, tablets, and other electronic devices and a 12V 8A (cigarette lighter style) receptacle enabling simple battery charging for added ease.
While not classified as 'RV Ready,' this Konner & Sohnen generator can still provides the advantage of RV connection via its L5-30R receptacle, ensuring power supply to your RV with an L5-30P to TT-30R adaptor.
Portability
With its enclosed inverter generator design (L24.4 x W17.3 x H20.1 in), the Konner & Sohnen KS 4000iEHS CO offers superior aesthetics and operates with minimized noise levels, distinguishing itself from standard, open frame generators. The featured design follows the latest trends and is ideal for easy and recreational use.
Weighing 88 lbs, the KS 4000iEHS CO is easily handled, ensuring it can go wherever your power needs are. Furthermore, with its set of 2 wheels and its folding handle, you can easily relocate the generator once it's set up.
Features
The KS 4000iEHS CO's control panel
Featuring a digital data center on its control panel, the KS 4000iEHS CO offers you convenient access to essential information about the lifetime run hours, fuel level, power output and frequency, facilitating effective monitoring of its activity and status.
In addition to this info, several light indicators serve to show you when the generator is overloaded, the generator is ready and its oil levels are insufficient.
In terms of security, the generator features an overload protection (circuit breaker) and an automatic low oil shut-off, ensuring peace of mind during its use.
It also includes a carbon monoxide sensor. This sensor is designed to monitor the level of carbon monoxide present during the generator's operation. If the generator is positioned incorrectly and carbon monoxide levels rise to an unsafe level, the generator will automatically shut down.
While the standard documentation and an owner's manual (opens in a new tab), helpful for starting the device promptly, come with the Konner & Sohnen KS 4000iEHS CO, the following accessories are also included: propane hose, tool kit and funnel.
Product Video
The Konner & Sohnen KS 4000iEHS CO versus other generators
The following charts are provided to give you an idea of how some of the key specs of the Konner & Sohnen KS 4000iEHS CO compare to inverter generators of similar power (between 3000 and 4000 W).
- With a dry weight of 88 pounds, the Konner & Sohnen KS 4000iEHS CO finds itself in the expected weight range for inverter generators able to produce between 3000 and 4000 rated watts. if you wish to prioritize weight, the Pulsar PGD40iSCO is one of the top contenders in its power category, weighing only 46 pounds.
- The inverter generator can be considered average in its noise for its type and power category, as it is rated at 62 dBA. If noise level is one your key decisive factors, you may find the Westinghouse iGen4000DFc appealing. It's rated at 52 dBA, making it one of the quietest generators in its power range.
- As for its autonomy, the KS 4000iEHS CO, with an autonomy of around 7.8 hours at a 50% load, is placed on the low end among the generators of its kind. Concerning the run times, one of the several devices with a comparable output, offering the highest autonomy, is the Firman W03663OF, which is able to run for around 18 hours.
- Run time is crucial, but it heavily relies on the fuel tank's capacity. Thus, considering fuel efficiency alongside is essential. In fact, this inverter generator is not one of the most fuel-efficient options in the aforementioned wattage range: its estimated gasoline consumption at 50% load is around 0.41 GPH. If not satisfied with the afore-mentioned fuel consumption, you may wish to check out the Pulsar PGD40iSCO. With a fuel consumption of as little as 0.22 GPH, it is one of the most efficient generators currently on the market.
Price comparison
As you can see from these interactive charts, when compared to other 3000-4000W dual fuel inverter generators, the Konner & Sohnen KS 4000iEHS CO is on the average side of the price range.
Therefore, this generator nicely fits in the expected budget for this kind of product.
The bottom line
- In the expected price range
- Dual fuel
- CO sensor
- USB-C ports
- Electric start
- Parallel capable
- Smart fuel switching system
- Inverter
- Decent weight (88 lbs)
- Acceptable noise (62 dBA)
- No remote start
- Relatively low run time
- Low fuel efficiency
Do you own the Konner & Sohnen KS 4000iEHS CO and agree (or disagree) with these strengths and weaknesses?
Let us know and write your own review.
Features and Specifications
| Inverter | Yes |
|---|---|
| Parallel capable | Yes, cable not included |
| RV ready | No |
| Fuel | Dual Fuel (gasoline/propane) |
| Engine | 223 cc OHV 4-stroke |
| Alternator | Copper windings |
| Starting system | Recoil, Electric |
| Warranty | 3 years |
| Voltage | AC: 120V 60 Hz, DC: 12V |
| Gasoline | Propane | |
|---|---|---|
| Running watts | 3,500 W | 3,150 W |
| Starting watts | 4,000 W | 3,600 W |
| Running amps | 29.2 amps | 26.3 amps |
| Peak amps | 33.3 amps | 30 amps |
| Run time @50% load | 7.8 h | 8.6 h * |
| Run time @25% load | Unknown | Unknown |
| GFCI outlets | No |
|---|---|
| Covered outlets | Yes |
| Automatic Voltage Regulation | Inverter |
| AC outlets |
|
| DC outlets | 2x 5V USB port (USB-C) 1x 12V 8A (cigarette lighter style) |
| Data center | Power output, fuel level, lifetime run hours and frequency |
| Indicators | Low oil, overload and output ready |
| Fuel tank | 3.2 gal |
| Fuel gauge | Digital |
| Weight | 88 lbs |
|---|---|
| Approx. dimensions (L x W x H) | 24.4 x 17.3 x 20.1 in |
| Noise (lower limit) | 62 dBA |
| THD | < 3% |
| Compliance | EPA, ANSI/PGMA G300-2023 |
| Security | Low oil and overload protection, CO monitoring |
| Spark arrestor | Yes |
| Neutral | Floating |
| Accessories included | Funnel, tool kit, propane hose, and battery |
| UPC | 426040536663 |
We've taken extra care to research and verify each of the specifications above. That said, occasional mistakes or omissions are still possible. If you spot any missing
or inaccurate information, feel free to suggest a correction so we can address it.
* Propane runtime is our own estimate, based on a 20 lbs tank and NIST 1994 GGE (Gasoline Gallon Equivalent) formula: 5.66 lbs of propane = 1 gal of gasoline.
About Könner & Söhnen
Könner & Söhnen is a power equipment brand operated by Germany-based DIMAX International. The company has sold generators and related equipment across Europe for more than a decade, with a range that includes both conventional and inverter models, as well as gasoline, propane, and dual-fuel options. In Europe, the brand has developed a reputation for solid build quality and good value for money, with generally positive customer feedback and strong ratings on platforms such as Trustpilot. Although still relatively little-known in the United States, it has been expanding its local presence with U.S. stock, customer support, service, and warranty coverage. Könner & Söhnen emphasizes German engineering and product development, although its generators are manufactured through overseas production partners.
Warranty Information
The Konner & Sohnen KS 4000iEHS CO is covered under a warranty for up to 3 years. This warranty may be limited and may not cover all parts of the generator.
For more information about the warranty of Konner & Sohnen generators, please consult Konner & Sohnen's warranty policies (opens in a new tab). Alternatively, you can also contact their Customer Support: 1-617-877-6198.
Questions & Answers
What can it power?
| Item | Running Watts | Starting Watts | |
|---|---|---|---|
| At home | Refrigerator (energy star) | 192 | 1192 |
| Hair dryer | 1800 | 1900 | |
| Toaster oven | 800 | 800 | |
| Total | 2792 W | 3792 W | |
| For camping | Radiant heater | 1300 | 1300 |
| RV refrigerator | 180 | 600 | |
| RV AC (11,000 BTU) | 1010 | 1600 | |
| Slow cooker | 270 | 270 | |
| Cell phone charger | 20 | 20 | |
| Total | 2780 W | 3370 W | |
| For work | Grinder | 1400 | 2500 |
| Demolition hammer | 1260 | 1260 | |
| Bug zapper | 80 | 80 | |
| Total | 2740 W | 3840 W |
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