Head-to-head · Best Garbage Disposals

InSinkErator Evolution Excel 1.0 HP vs InSinkErator Evolution Septic Assist 3/4 HP

Which is the better buy? Side-by-side on rating, price, strengths, and watch-outs — with the published ratings we averaged to get there.

The short answer

InSinkErator Evolution Excel 1.0 HP comes out ahead by a narrow margin (4.7 vs 4.4). The gap is mostly about Large families and heavy daily cooks who want the quietest continuous-feed grinder available and will pay premium for finer particle output and a manufacturer-dispatched warranty. — read the strengths below before deciding.

Higher ratedRanked #1 in Best Garbage Disposals

InSinkErator Evolution Excel 1.0 HP

4.7

$379

The Excel is InSinkErator's top-of-line continuous-feed unit and the benchmark every other 1 HP disposer chases. Reviewers across shouldit.com, Consumer Reports, and Family Handyman rank it the quietest and most thorough grinder they have tested, processing 90 oz of mixed scraps in about two minutes. Plan for the heft and the cord-kit add-on.

Strengths

— 1 HP Dura-Drive induction motor with 3-stage MultiGrind handles bones, fruit pits, and dense scraps in roughly two minutes
— SoundSeal Technology insulation blanket plus anti-vibration tailpipe and sink baffle make it the quietest continuous-feed unit reviewers tested
— 40 oz stainless steel grind chamber with alloy stainless components resists corrosion and odor buildup over years of daily use

Watch-outs

— Heaviest disposer on the consumer market at ~25.5 lb, awkward to support during install
— Power cord sold separately as a kit add-on
— Premium pricing more than triples a 1/2 HP starter unit

$379 · Check Price on Amazon Full review →

Ranked #5 in Best Garbage Disposals

InSinkErator Evolution Septic Assist 3/4 HP

4.4

$269

Septic Assist is the disposer to buy if your home is on a septic tank rather than a city sewer connection. It pairs an Evolution-series 3/4 HP MultiGrind chamber with InSinkErator's Bio-Charge injector, which doses enzyme-producing microorganisms into every cycle to keep septic-tank sludge from accumulating. Plan on cartridge refills as an ongoing cost.

Strengths

— Bio-Charge cartridge automatically injects 300 million enzyme-producing microorganisms per cycle to break down food waste and reduce septic-tank sludge buildup
— 3/4 HP Dura-Drive induction motor with 2-stage MultiGrind chamber matches the Evolution Compact's grinding performance
— Full SoundSeal Technology insulation and anti-vibration mount keep operation conversational

Watch-outs

— Bio-Charge cartridge needs replacing every 3-4 months at typical use (~$8 per cartridge, recurring cost)
— Some owners report the cartridge bottle dislodging during operation and splashing inside the cabinet
— Premium price for a 3/4 HP unit driven by the bio-charge mechanism rather than raw grinding power

$269 · Check Price on Amazon Full review →

How they stack up

InSinkErator Evolution Excel 1.0 HP

Sits a clear tier above the 3/4 HP Evolution Compact in motor power and grind stages, with a 40 oz chamber against the Compact's 34.6 oz. Significantly quieter and finer-grinding than the entry-level Badger 5 1/2 HP and a meaningful step up from the 3/4 HP Septic Assist for non-septic homes that want a third grind stage.

InSinkErator Evolution Septic Assist 3/4 HP

Shares the 3/4 HP MultiGrind chamber with the Evolution Compact but adds the Bio-Charge cartridge injection and is roughly $50 more. Comparable in price to the Cover Control Plus batch-feed, just with a different specialty (septic compatibility instead of safety). Less raw grinding power than the Excel 1 HP, but the Excel does not solve the septic compatibility problem.

Specs side-by-side

Spec	InSinkErator Evolution Excel 1.0 HP	InSinkErator Evolution Septic Assist 3/4 HP
Motor	1.0 HP Dura-Drive induction	3/4 HP Dura-Drive induction
Grind Stages	3 (MultiGrind)	2 (MultiGrind)
Feed Type	Continuous	Continuous
Chamber Capacity	40 oz stainless steel	40 oz stainless steel
Sound Insulation	SoundSeal Technology	SoundSeal Technology
Mounting	3-Bolt Lift & Latch	3-Bolt Lift & Latch
Weight	25.5 lb	25.5 lb
Warranty	7-year We Come To You in-home	8-year We Come To You in-home
Septic Compatibility	—	Bio-Charge enzyme injection per cycle

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