InSinkErator Evolution 1 HP Garbage Disposal Review
The InSinkErator Evolution 1 HP Advanced Series sits at the top of the residential Evolution range. It’s built for busy kitchens that regularly tackle tougher scraps — think chicken bones, fibrous veggies and larger leftovers — while still keeping noise low enough that you can chat at the sink. In this review we break down its 4-Stage MultiGrind® system, SoundSeal® noise reduction, installation with the EZ Connect system, and how it compares with other InSinkErator models so you can decide if the Evolution 1 HP is the right upgrade for your sink.
Quick specs
| Motor | 1 HP Dura-Drive® induction motor |
|---|---|
| Grind stages | 4-Stage MultiGrind® Technology |
| Noise reduction | SoundSeal® Technology — up to 80% quieter than a Badger 5 |
| Dimensions | Approx. 12.25" high, compact body for under-sink cabinets |
| Weight | Approx. 20.2 lb |
| Included components | Discharge tube, garbage disposal unit, EZ Connect hardwire adaptor, sink stopper, sink flange and mounting hardware |
| Power cord | Sold separately — can be hardwired or used with an optional InSinkErator power cord kit |
| Dishwasher drain connection | Yes, with removable dishwasher inlet plug |
| Warranty | 10-year limited in-home service warranty (parts and labor) |
Who the Evolution 1 HP is best for
- Households that cook frequently and generate heavier food waste (bones, fibrous veg, peels and leftovers).
- Families who want a quieter kitchen than entry-level disposals can offer.
- Homes with older pipes or septic considerations, where finer grinding helps prevent clogs.
- Owners replacing an older InSinkErator unit who want a noticeable upgrade in power and sound insulation.
Key features & benefits
4-Stage MultiGrind® for a finer grind
Most entry-level disposers use a 1-stage or 2-stage grind system. The Evolution 1 HP steps that up to 4-Stage MultiGrind® Technology, designed to break food waste down into much finer particles. Customers mention that it handles bones and fibrous scraps more easily and helps reduce the risk of clogs or residue in the drain line, especially compared with older single-stage models.
SoundSeal® technology: noticeably quieter
Several buyers call out how quiet this disposer is compared with their old unit. InSinkErator’s SoundSeal® Technology combines multiple components:
- Quiet Collar® sink baffle to muffle noise at the sink opening.
- Anti-Vibration Mount® to reduce vibration transfer to the sink.
- Sound jacket and trim shell around the motor.
- Anti-vibration tailpipe coupler to reduce pipe rattle.
For many users, the water running into the sink is louder than the disposal itself. That’s a big upgrade if you’re used to the harsh buzz of older or builder-grade units.
EZ Connect installation with Lift & Latch
The Evolution 1 HP uses InSinkErator’s EZ Connect system, including Lift & Latch technology that lets you hook the disposer onto the mount before tightening the ring. This saves a lot of “hold it up with one hand, tighten with the other” frustration, especially given the unit’s 20+ lb weight.
One common theme in reviews is that the electrical plug connection on the EZ Connect adaptor can be fiddly, especially when working with thick copper wires inside a tight cabinet. It’s still a DIY-friendly job for many homeowners, but if you’re not comfortable with electrical work, consider having an electrician handle the final hook-up.
Durability and long-term reliability
InSinkErator backs the Evolution 1 HP with a 10-year in-home service warranty. One long-term InSinkErator owner noted that their previous unit lasted over 20 years before being replaced with a new Evolution model. Between the stainless steel grind components, powerful 1 HP motor and extended warranty coverage, this disposal is designed as a long-haul investment rather than a short-term fix.
Real customer feedback
Across more than 600 Amazon reviews, the Evolution 1 HP holds an average rating of around 4.6 out of 5 stars. A few key themes stand out:
- Performance: many buyers call it the best disposal they’ve ever used, praising how quickly it clears tough scraps.
- Quiet operation: multiple reviews mention being able to use it while family members sleep or while chatting at the sink.
- Ease of installation: most describe installation as straightforward, especially when replacing an existing InSinkErator.
- Weight and size: the unit is heavier than smaller models, which is expected for a 1 HP motor but worth planning for during install.
- Price: a minority of buyers find it expensive, but most feel the performance and warranty justify the cost.
- EZ Connect plug: a few users rate it 5 stars overall but call the new electrical plug design harder to connect than classic wire-nut setups.
Pros & cons
What we like 
- Powerful 1 HP motor with 4-stage grinding for tougher waste and finer particles.
- Very quiet for its power level thanks to SoundSeal® Technology.
- Compact height for a 1 HP unit, leaving room for storage or a water filter.
- DIY-friendly mount with Lift & Latch and EZ Connect hardware.
- 10-year in-home warranty offers excellent long-term value.
Things to keep in mind
- Premium price point compared with Badger and some Power/Contractor models.
- Heavier unit — easier with two people for final mounting.
- Power cord not included — you’ll need to hardwire it or add an optional InSinkErator power cord kit.
- The EZ Connect electrical plug can be tricky in tight spaces or with stiff wiring.
Evolution 1 HP vs other InSinkErator models
If you’re trying to choose between the Evolution 1 HP and other InSinkErator disposals, here’s how it stacks up at a glance:
| Model | Motor | Grind stages | Noise level | Best for |
|---|---|---|---|---|
| Evolution 0.75 HP | 3/4 HP | Multi-stage | Quiet | Most family kitchens that cook regularly but don’t grind heavy bones often. |
| Evolution Septic Assist / Septic Guard 3/4 HP | 3/4 HP | Multi-stage | Quiet | Homes on septic systems that want finer grinding and septic-friendly use. |
| Evolution 1 HP (this model) | 1 HP | 4-Stage MultiGrind® | Quietest SoundSeal® | High-use kitchens, tough scraps, and buyers who want maximum power and quiet. |
| Contractor 333 | 3/4 HP | Standard grind | Louder | Value-focused installs and contractor-grade replacements. |
For a deeper look at how the Evolution range compares, see our InSinkErator Evolution Series Mini Guide, and for a brand-wide comparison of Badger, Evolution and Power models, check out Badger vs Evolution vs Power: Which InSinkErator Is Best?
Installation tips and accessory recommendations
- If you’re adding a cord instead of hardwiring, see our InSinkErator Power Cord Kit Guide.
- Hooking up a dishwasher? Our Dishwasher Connector Kit Guide explains the simple steps and parts you’ll need.
- To keep things extra quiet and control splashing at the sink opening, consider an upgraded Sink Baffle & Stopper.
Frequently asked questions
Is the InSinkErator Evolution 1 HP too powerful for my plumbing?
No. The extra power is used to grind food waste more finely, which can actually be easier on most drain lines. As with any disposal, avoid grinding large amounts of grease, fat or non-food items.
How quiet is it compared with an older Badger?
Many owners upgrading from a Badger 5 or similar say the Evolution 1 HP is dramatically quieter. In many kitchens, normal conversation easily continues while the disposer is running.
Can I install the Evolution 1 HP myself?
If you’re comfortable working under the sink and have basic tools, the Lift & Latch mount and EZ Connect hardware make this a realistic DIY project. The heaviest part is supporting the disposer during installation, so having a second person or a support block under the unit can help. For the electrical connection, hire an electrician if you’re unsure.
Does it come with a power cord?
No. The Evolution 1 HP is supplied ready to be hardwired, or you can add an optional InSinkErator power cord kit if your outlet is accessible under the sink.
Is this disposer suitable for septic systems?
While many septic owners do use Evolution models, InSinkErator also makes septic-focused models in the range. If you’re on a sensitive or older septic system, consider checking out our Evolution Septic Guard 3/4 HP review and speak with your plumber about local recommendations.
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