Yamaha EF2000iS 2000 Watt Inverter Generator Review

Yamaha is one of the market leaders when it comes to generators, boasting a range of high-quality, compact, and powerful models that are impressively quiet.

The Yamaha EF2000iS generator is no different than its predecessors, with impressive power and great portability rating. 

The Yamaha EF2000iS generator is an excellent choice for anyone who is looking for a portable generator that has enough power to fall back on in case of an emergency.

Thanks to the lightweight feeling, you can also take the generator to numerous holiday destinations with you.

2 Blue yamaha Generators

Today we’re going to be looking at the Yamaha EF2000iS generator to see whether it’s worth the money.

We’ll be talking through the features as well as what we particularly liked as well as what we didn’t.

Yamaha EF2000iS Generator Specifications

The size is one of the main talking points when it comes to the Yamaha EF2000iS generator. It measures in at 19.3 x 11 x 17.9 inches and weighs only 44.1 pounds.

This is on the lower end of the scale in terms of portable generator weight, so if you’re looking for one of the lightest models with still good power this model might be the one for you. 

The maximum power that you can get from the  Yamaha EF2000iS generator is 2000 watts while the running power is 1600 watts.

The engine is 79cc OHV, so it’s not the most powerful generator on the market. However, this model will still run a decent amount of appliances and devices without a hitch. 

There are two 120 AC outlets as well as one 12V DC outlet that you can use to charge batteries. 

You can run the generator for up to 10.5 hours at 25% load without having to turn it off to refuel. The fuel tank holds up to 1.1 gallons of fuel and it runs on normal unleaded fuel.

Yamaha offers a 3-year limited warranty on the EF2000iS generator, offering you peace of mind for plenty of time after you’ve purchased it. 

Yamaha EF2000iS Generator Features

Let’s take a deeper look into the Yamaha EF2000iS generator’s features.

Yamaha never fails to impress with its features, and this reflects in the price points that they set.

So, pay attention to all these impressive features and see whether you think the generator is worth the investment!

Power and performance

The Yamaha EF2000iS generator runs at 1600 watts on the regular but it can reach a maximum output of 2000 watts.

There are more powerful generators on the market but you will lose the portability factor when amping up the power. However, if you need additional power every now and then you can take advantage of the parallel capabilities. 

This allows you to connect two generators together so that you can use double the amount of power. This is great for people who don’t always want to lug around a large generator but do need the extra power sometimes. 

Moving onto the performance of the Yamaha EF2000iS generator, it’s as good as you’d expect from the brand. You can run the generator for 10.5 hours at 25% load without having to turn it off. 

The Pulse Width Control feature allows the generator to deliver pure sine waves which ensure high-quality power only. This means that you don’t have to worry about your electronics becoming damaged. 

Noise level

Everyone wants a quiet generator, right? The main concern with getting a generator is that you won’t be able to relax on holiday or hear yourself think thanks to the ferocious roar that comes with owning a generator.

Luckily, Yamaha has found a way to work around this. 

The Yamaha EF2000iS generator comes with a state of the art muffler which ensures that the sound level coming from this model is kept to a minimum. You can expect a noise level of around 51 to 61 decibels, depending on the size of the appliances you’re running. 

This equates roughly to the sound of a lively conversation. Many people don’t even realize that they’re around a generator when the Yamaha EF2000iS generator is running. You no longer have to hide out in your tent from embarrassment when the generator is running! 

There are also little rubber feet on the bottom of the generator. These will absorb a lot of the shock from the running generator, meaning that the body won’t vibrate loudly on the floor. You won’t even need to carry around an anti-vibration mat!


The Yamaha EF2000iS generator is an excellent option if you want to travel around with your generator. It weighs less than most generators of the same power and is compact enough to store out of sight when it’s not needed.

There is a comfortable carry handle build onto the model as well, so you don’t have to awkwardly carry it around. 

The rubber feet also allow you to place the generator on any type of floor that you want. It’s normally advised that you only place the generator on soft flooring, but the rubber feet eliminate the need for this.

The rubber feet will also prevent the generator from getting scratched or damaged on hard flooring. 


We all love an environmentally friendly generator that makes us feel slightly better when using them for a prolonged period of time.

The economy control switch on the Yamaha EF2000iS generator is another one of its main benefits. The switch ensures that the motor speed is regulated to match the current load. 

What this means is that the generator will only create as much power as you need at any given time, ensuring that you’re not wasting any power.

You won’t be wasting any fuel either, so you can save money with this helpful feature. It also reduces the amount of noise coming from the generator. 

Safety features

All of the best generators come with sufficient safety features to protect their users. The Yamaha EF2000iS generator comes with plenty of safety precautions to put your mind at rest. One is the oil watch warning system that notifies you when the oil levels are low. 

Low oil levels can damage the interior of your generator, so this warning prevents you from having to replace your damaged model. There is also a fuel gauge that ensures that you never run out of fuel as this can also damage the unit.

What We Loved

You might be surprised to hear that we like the Yamaha EF2000iS generator a lot.

It’s fuel-efficient and comes with an eco-mode to save you money on fuel, and the noise pollution is always kept to a minimum, so you can take your Yamaha generator anywhere that you want to holiday. 

The parallel capabilities allow you to connect the model with another generator to double the amount of power.

You can keep one generator stored away and only use it when you really need it instead of wasting money and weight allowance on a bigger generator. 

This generator is also CARb-compliant which means that it doesn’t produce as much air pollution that would prevent you from using it in different states. You can use the Yamaha EF2000iS generator in each of the 50 states including California. 

Finally, we love how portable the generator is, with a much lighter weight than the majority of other generators on the market of the same size. Yamaha also offers a 3-year limited warranty that protects your purchase for long after you originally buy your generator. 

What We Didn’t Like 

There aren’t many things we don’t like about the Yamaha EF2000iS generator, but there are a few qualms that we wish could be rectified.

One of which is the fact that you get no oil or accessories to help you with adding or draining oil from the generator. Some other generators on the market do offer these services, so we don’t see why Yamaha cannot. 

We also think that the generator would benefit from a USB charging port for smaller devices such as smartphones.

The only other thing we don’t particularly like about the Yamaha EF2000iS generator is the high price point. It is up to you whether you believe that the features and quality is worth the additional cost. 


Overall, the Yamaha EF2000iS generator is an excellent model on the market with plenty of outlets and a decent amount of power.

There are safety features in place to prevent the generator from breaking down prematurely. The noise level is impressively quiet, so this is a great option to take on holiday. 

There are only a few issues that we thought could be improved upon, but these are easily worked around if you decide to choose this generator.

You don’t need a USB outlet to charge your small devices, but it is certainly easier. 

Either way, the Yamaha EF2000iS generator is a high-quality and popular generator on the market. Opting for this generator will certainly aid your holiday or your family in an emergency.

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    I'm an environment and energy blogger who teaches outdoor and energy enthusiasts how to be better informed when it comes to purchasing or maintaining a generator, solar panel system, or anything else related to your energy needs.