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K&S Könner&Söhnen 3000iG S dual fuel, 3.0 kW continuous, 3.3 kW peak, ≤ 2 % THD review

A dual-fuel inverter generator running on petrol or LPG, delivering 3000 W continuous and 3300 W peak with a published total harmonic distortion of 2 % or less.

The bottom line The only generator in this catalogue to publish a distortion figure, and one of two to publish a noise level. Its gas output is not stated, its noise carries no distance, and four of its nine lines are blank.

A dual-fuel generator with the one specification nobody else publishes.

Two per cent

Total harmonic distortion of 2 % or less. Across every inverter, UPS and generator in this catalogue, one product publishes a distortion figure and this is it. It is what separates a clean inverter output from one that merely claims to be, and it is the number sensitive equipment actually cares about.

Two fuels

Petrol or LPG. The third bullet makes the argument: flexible fuel choice, lower running costs, reliable supply. The storage advantage — gas keeps where petrol degrades — is the real one for a machine kept for outages, and the listing does not make it.

The output that is not published

3000 W continuous and 3300 W peak, both stated for petrol. The LPG figure is normally lower and it does not appear. Sizing against the fuel that will actually be used is the rule, and half the information is missing.

Sixty-eight decibels, from nowhere

A figure with no distance. Scheppach publishes 66 dB, also with no distance. Two numbers that cannot be compared with each other or with anything else.

Availability

German, French, Italian and Spanish Amazon stores quoted 594 € to 699 € when this page was compiled.

British Amazon catalogue carries an entry for it, with nobody selling.

American Amazon store returned nothing at all, so the buy button there runs a search instead of landing on an empty page.

These figures are what Keepa reported on the day this page was last updated. Availability and pricing move without notice.

Prices quoted in this text were read on 16 September 2026. The live price is at the top of the page.

What it gets right, and what it leaves out

Strengths

  • Total harmonic distortion is published at 2 % or less — the only distortion figure in this entire catalogue
  • Dual fuel, petrol or LPG, with the flexibility argument made explicitly
  • A noise figure is at least given, which four of six generators here omit entirely

Compromises

  • The 68 dB figure carries no distance, so it compares to nothing
  • The LPG output is not published separately from the petrol figure
  • No tank, no runtime, no weight, no outlets

Specifications

Rated3000 W continuous on petrol, first bullet
Maximum output3300 W peak, first bullet
WaveformPure sine at a stated total harmonic distortion of 2 % or less, second bullet — the ONLY generator here to publish a distortion figure
TankNowhere in the listing
Runtime at a stated loadNowhere in the listing
Noise at a stated distanceAbout 68 dB from the enclosed housing, fourth bullet; NO distance is stated
WeightNowhere in the listing
OutletsNowhere in the listing
Emissions classNowhere in the listing
Amazon referenceB0HCPGKWY4 (same reference on 5 Amazon marketplaces)
EAN4260405367177

Questions owners ask about this one

What does 2 % THD tell me?

How far the output departs from a true sine wave. Below a few per cent is what sensitive electronics want, and publishing the figure is the only way to distinguish a good inverter output from an adequate one. Twenty generators, UPS units and inverters in this catalogue, and one publishes it.

Does it deliver 3000 W on gas too?

The first bullet gives 3300 W peak and 3000 W continuous specifically in petrol operation. The LPG output is not stated, and it is usually lower. Sizing against the fuel you will actually use is the rule, and that figure is not on this page.