What’s the Best InSinkErator Waste Disposal Unit? – 2019

Home > Kitchen > Garbage Disposers | Last updated October 29th, 2019

Best on a Budget

InSinkErator Badger 5XP waste disposal unit

InSinkErator Badger 5XP

Best Overall

InSinkErator Evolution Excel garbage disposer
InSinkErator Evolution Excel

Best for Septic Tanks

Photo of InSinkErator Evolution Septic Assist
InSinkErator Evolution Septic Assist

The Best InSinkErator Garbage Disposers Compared

InSinkErator waste disposal units are small devices that fit under your kitchen sink. They quickly and quietly grind food waste as it passes through your plug hole and wash the ground up food waste into your waste water system.

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Why Use an InSinkErator?

Food waste makes up a significant proportion of what a typical household throws away.

In fact, the UK alone throws away over 7 million tonnes of food waste every year! Most of this unfortunately ends up in landfill, putting out methane and other dangerous greenhouse gasses.

By installing a waste disposal unit, you help contribute to reducing your landfill footprint. In some areas your InSinkErator food waste will even be used to create bio-fuels that.

Many local councils even recommend that homes fit food waste disposal units as they reduce landfill and are more cost effective than food bin collection.

Best on a budget badge

The Best InSinkErator on a Budget

InSinkErator Badger 5XP

InSinkErator Badger 5XP waste disposal unit


  • Built in the USA
  • 3/4 HP Dura-Drive motor
  • Stainless steel grind chamber
  • Cheap to run
  • 3-year parts & in-home warranty
  • Dishwasher drain connection


  • Power cord sold seperately
  • Galvanized steel grind components
  • Single stage grinding chamber
Best InSinkErator on a budget badge

The Best InSinkErator Overall

InSinkErator Evolution Excel

InSinkErator Evolution Excel garbage disposer


  • Built in the USA
  • 1 HP Dura-Drive motor
  • 3-stage grind chamber
  • Stainless steel grind chamber & components
  • SoundSeal noise dampening
  • Auto-reverse feature & jam-senso
  • 7-year parts & in home warranty
  • Dishwasher drain connection


  • Power cord sold seperately
  • Slows down sink drainage
  • Very bulky under the sink
Best for septic tanks reward badge

The Best InSinkErator for Septic Tanks

InSinkErator Evolution Septic Assist

Photo of InSinkErator Evolution Septic Assist


  • Built in the USA
  • 3/4 HP motor Dura-Drive motor
  • 2-stage grind chamber
  • Stainless steel grind chamber & components
  • SoundSeal noise dampening
  • Septic tank safe
  • Bio-Charge enzymes break down food waste
  • 4-year in-home warranty


  • Power cord sold seperately
  • Issues with Bio-Charge bottle coming loose/leaking
  • Bio-Charge injection system not repairable

How InSinkErator Waste Disposers Work

Most people incorrectly believe that InSinkErator disposer units contain sharp blades or propellers that chop up the food as it goes through your plug. In fact, InSinkErators do not use blades at all but instead use a grinding action that breaks your leftover food down in to small pieces before mixing them with water and washing them away.

What happens to the InSinkErator food waste?

You are probably wondering where the food waste goes after it leaves your InSinkErator though right?

Well if you use a septic tank system your food waste will travel along your waste water pipe into the septic tank as usual. The food waste that exits an InSinkErator is almost completely liquefied by the grinding mechanism so you do not have to worry about clogs or blockages in your waste water system.

Most people’s waste water however goes into a wastewater pipe or sewer system which takes everyone’s waste to a water treatment facility. A filtering process removes any particles like food waste and puts them into a digester tank where they are broken down. Many water treatments facilities use this to re-purpose your old waste into fertiliser or bio-fuel!

InSinkErators & Septic Tanks

Many people are under the false impression that InSinkErators cannot be used if you have a septic tank system installed. In fact, modern garbage disposers grind the food down so effectively that septic tanks can easily handle the waste water. For those worried about the food matter not breaking down enough in their septic tank, InSinkErator also sell a waste disposer that contains special enzymes that help break down food waste even further.

Check out our review of the best waste disposers for septic tank systems for more information about septic-safe food disposers.

How to Operate an InSinkErator

  1. Turn on your water so that the food passes through the unit efficiently.
  2. Turn on the InSinkErator. Most InSinkErators come with an air switch which is fitted next to your sink for safe and easy access. Air switches are a special push button switch that use air pressure to turn the unit off and on. This means that even if water splashes from your sink into the switch you are completely isolated from any live socket and allows you to safely operate electronics in a wet environment like a kitchen sink!
  3. Slowly feed your leftover food waste into down the plug hole into the waste disposer.
  4. Once you have got rid all your food turn of the InSinkErator unit but leave the water running for a few seconds afterwards. This flushes any remaining waste out of the unit and into your waste water system.

What Can You Put Down an InSinkErator?

Modern food waste disposers will handle pretty much anything you can throw at them with a few exceptions. Fats, grease and cooking oils should not go down a sink anyway as they will eventually block waste water pipes. Many InSinkErator models come with two or three-stage grinding mechanisms that will even chew through fish and meat bones.

Can I put it in?


  • Fruit
  • Vegetables
  • Meat
  • Small Fish & Meat Bones
  • Coffee Grounds
  • Egg shells
  • Leftovers
  • Fruit Peels


  • Packaging
  • Metal
  • Plastic
  • Cooking Oil
  • Grease
  • Fats

Compare InSinkErator Models

If you are trying to work out which InSinkErator to choose check out the comparison table below which highlights the features of the most popular models.

InSinkEratorGrind Chamber SizeGrinding StagesMotor SizeWarrantyAir Switch 
Model 46980mlx1.55HP2 YearsNot IncludedView Price
Model 56980mlx1.55HP3 YearsIncludedView Price
Model 66980mlx1.75HP4 YearsIncludedView Price
Evolution 1001005mlx2.75HP5 YearsIncludedView Price
Evolution 2001180mlx3.75HP6 YearsIncludedView Price