Finding the right portable generator is a task that comes with its set of challenges. With factors like size, power, noise level, and budget coming into play, choosing the ideal one can be tricky. In this comparison guide, we are taking a close look at two popular models – Honda EU22is and Yamaha EF1000iS.
Both of these inverter generators are known for their reliable performance and quality craftsmanship. We’ll compare them in terms of specs, features like running power, starting power, engine type, rated output (kVA), and the presence of an inverter. This guide aims to help you figure out which model suits your needs best.
Performance & Power
Running Power (W): Honda EU22is offers 1800W while Yamaha EF1000iS provides 1000W. This means the Honda is the stronger model. It’s important not to overload your generator – so if you plan on using it for intensive tasks like powering a space heater or an electric grill, the Honda could be ideal for you.
Starting Power (W): The maximum power Honda EU22is can output briefly (2200W) is greater than that of Yamaha EF1000iS (1600W). Do note that some machines need more power when they start up.
Engine type: With a 121cc OHV 4-stroke engine, Honda EU22is boasts a larger capacity than Yamaha EF1000iS’s 50cc OHV 4-stroke. A bigger engine usually means more power output and better fuel efficiency.
Rated Output (kVA): Honda EU22is has an apparent power rating of 1.8 kVA, whereas Yamaha EF1000iS has half that at 0.9 kVA. If you’re using tools that pull lots of current, a higher kVA rating might be needed.
Inverter: Both generators have inverter technology. This means they can produce clean power crucial for sensitive electronics like laptops and are generally quieter and more fuel-efficient.
Fuel & Run Time
Fuel Type: Both Honda EU22i and Yamaha EF1000iS use petrol as fuel. Petrol is widely available and usually easy to handle.
Fuel Tank Capacity: The fuel tank on the Honda EU22is holds more capacity (3.6L) than Yamaha’s model (2.5L). More capacity generally results in longer run times between refills but also adds weight to the generator.
Run Time: Interestingly, Yamaha EF1000iS offers a longer run time at 12 hours per refill at 1/4 load whereas Honda’s model offers only 3 hours at 1/4 load. This distinction could be critical if you need extended usage, like during outdoor trips or emergencies.
Dry Weight: The Honda EU22is weighs significantly more than the Yamaha EF1000iS – 21.1kg compared to 12.7kg respectively. A lighter generator is often easier to move, but heavier models could offer additional features like a larger fuel tank or more power output.
Size: The dimensions of each generator differ slightly, with the Honda EU22is measuring 50.9 x 29 x 42.5 cm and the Yamaha EF1000iS measuring 45 x 24 x 38 cm. The difference here might not be massive but could impact storage and transportation.
Wheels: Neither of these units comes with wheels, so you’ll need to factor in their weight when considering portability.
Outlets & Parallel Use
AC Outlets: The Honda EU22is comes with two AC outlets, while the Yamaha EF100iS comes with one. This means you can power more devices simultaneously using the Honda generator.
DC Outlets: Both models feature a single 12V DC outlet, good for charging batteries or smaller appliances. Their amp ratings are slightly different but this should not have a significant effect on usability.
Parallel Use: The Honda EU22is supports parallel usage, meaning you can connect two of the same model to effectively double your power output, which is a pretty handy feature. Unfortunately, the Yamaha EF1000iS doesn’t offer this capability.
Features & Usability
Various features between these two generators present clear similarities and differences. Both have recoil starting systems (meaning they need a manual pull to start), and they have oil alert systems to prevent engine damage. Other notable features in Honda EU22is include an optional accessory kit and Eco-Throttle for fuel efficiency. Yamaha EF1000iS stands out with its lightweight design and a brushless alternator.
Looking at noise levels, Honda EU22sis is significantly louder than Yamaha EF1000iS – 89 dBA compared to just 47 dBA respectively. To put this in perspective, the Honda’s noise level is comparable to heavy city traffic while the Yamaha operates more quietly than normal conversation.
Honda EU22is vs Yamaha EF1000iS Comparison Table
|121cc, OHV, 4-stroke
|50 cc, OHV, 4-stroke
|Max / Starting watts
|12V / 8.3A
|12V / 8A
|AC Frequency (Hz)
|Rated Output (kVA)
|Fuel Tank Capacity
|Run time (Hours)
|3 at 1/4 load
|12 at 1/4 load
|Dry Weight (Kg)
|Size (L x W x H)
|50.9 x 29 x 42.5 cm
|45.0 x 24.0 x 38.0 cm
|Number of AC Outlets
|Noise Level (dBA)
After comparing each aspect of these generators, it is clear that both come with their advantages. Honda EU22is provides more power and longer run time which makes it suitable for those who want a robust generator for extensive and intensive tasks. On the other hand, Yamaha EF1000iS excels in its compactness and low noise levels – an ideal combination for camping trips or quiet home use. At the end of the day, the best choice will vastly depend on your individual requirements whether it’s power, size, fuel efficiency or additional features.