InSinkErator vs Waste King — Which Disposal Is Better?
InSinkErator wins on reliability and parts availability. Waste King wins on warranty length and price. For most homeowners replacing an existing disposal, we recommend sticking with InSinkErator if one is already installed — the 3-bolt mount carries over and the swap takes under an hour. For new installations or budget-conscious buyers, Waste King’s L-8000 at $150-$200 with a 20-year warranty is the better deal.
That is the short version. Here is the data behind it, pulled from manufacturer specs and community feedback. For a broader look at all three major brands, see our best garbage disposal guide.
Video guide
Video: “Our Top 4 Garbage Disposal Recommendations” by Robins Plumbing
Is This Comparison for You?
This comparison is for you if:
- You have narrowed your search to InSinkErator or Waste King
- You are replacing a dead or failing disposal and comparing options
- You want motor type and warranty data, not marketing fluff
This comparison is NOT for you if:
- You are not sure what HP you need — start with our HP size guide
- You want to fix your current disposal instead — see our garbage disposal troubleshooting page
- You want Moen included — we cover Moen briefly in the best garbage disposal guide
Side-by-side comparison
| Feature | InSinkErator | Waste King |
|---|---|---|
| Motor type | Induction | Permanent magnet |
| Motor speed | 1725 RPM | 2600-2800 RPM |
| Noise level | Moderate to low | Moderate |
| Grinding approach | High torque (slow, forceful) | High speed (fast, shearing) |
| Best warranty | 8 years (Evolution Excel) | 20 years (L-8000) |
| Price range | $80-$400 | $75-$291 |
| US market share | ~70% | ~15% |
| Mounting | 3-bolt Quick Lock | EZ Mount (twist-lock) |
| Best for | Reliability, plumber familiarity | Value, warranty coverage |
The difference comes down to motor philosophy. InSinkErator motors spin slower but push harder. Waste King motors spin faster but with less force per rotation. Both approaches grind typical household food waste without problems — they just handle edge cases differently.
InSinkErator — what we found
InSinkErator holds roughly 70% of the US residential disposal market. That number matters for a practical reason: any plumber has installed dozens of them, and every hardware store stocks compatible parts. If something goes wrong in year five, finding a replacement gasket or splash guard is never a problem.
The motor technology is induction-based, spinning at 1725 RPM across all models. Induction motors generate higher torque than permanent magnet motors at the same HP rating. In practice, this means InSinkErator disposals do better with hard food waste — chicken wing bones, fruit pits, and ice cubes for cleaning. They are more likely to power through a jam rather than stall.
The lineup breaks into two tiers:
- Badger series ($80-$200): Budget workhorses with 1/3 to 1 HP, galvanized steel grind chambers, and 1-2 year warranties. The Badger 5 (1/2 HP, $80-$120) is the most frequently recommended budget disposal in homeowner forums. See our full Badger 5 review for a closer look.
- Evolution series ($200-$400): SoundSeal insulation, stainless steel grind components, and 4-8 year warranties. The Evolution Excel (1 HP, $350-$400) is the quietest residential disposal we have seen.
The weak spot is warranty length. InSinkErator’s longest warranty is 8 years on the Evolution Excel. Waste King offers up to 20 years on the L-8000 at a lower price. You can view the complete lineup on the InSinkErator product page.
Waste king — what we found
Waste King uses permanent magnet motors across its entire lineup. These motors spin at 2600-2800 RPM depending on HP — about 50-63% faster than InSinkErator’s 1725 RPM induction motors. The speed advantage matters most with fibrous foods. Celery, corn husks, and asparagus get shredded before the fibers can wrap around the impellers, which is the most common cause of jams in slower-spinning disposals.
The tradeoff: less torque per rotation. A Waste King at the same HP rating will occasionally struggle with very hard items that an InSinkErator would grind through on torque alone. In practice, both handle typical household food waste without issues.
Where Waste King pulls ahead is warranty coverage. The L-8000 (1 HP) carries a 20-year limited warranty with in-home service — no other residential disposal brand comes close. Even the mid-range L-3200 (3/4 HP, $230) gets an 8-year warranty, matching InSinkErator’s best. The complete model lineup with pricing is on the Waste King official page.
Three models (L-3200, L-5000TC, L-8000) include SoundSHIELD insulation. Budget Waste King models (L-111 at $124, L-1001 at $137) have no sound dampening and are noticeably louder than insulated models from either brand.
All Waste King disposals ship with pre-installed power cords and are septic-tank compatible. The EZ Mount twist-lock system is standard, though the 9980 model uses a 3-bolt mount for InSinkErator-compatible installations.
Our Waste King L-8000 review covers the flagship model in detail.
Which Should You Buy?
Get InSinkErator if:
- An InSinkErator is already installed (same 3-bolt mount, 30-minute swap)
- You want the quietest possible disposal (Evolution Excel)
- Your plumber recommends it (most do, because they know the product)
- Parts availability matters — 70% market share means parts are everywhere
Get Waste King if:
- Warranty length is a priority (up to 20 years on the L-8000)
- You want 1 HP power without paying InSinkErator Evolution prices
- You are doing a new installation (no existing mount to match)
- Budget is tight but you still want stainless steel grind components
Either brand works if: you are looking at the 3/4 HP tier. InSinkErator’s Evolution Compact ($200-$250, 4-year warranty) and Waste King’s L-3200 ($230, 8-year warranty) are close enough that personal preference or existing mount type should decide. Check repair and replacement costs to see how each brand fits your budget.
FAQ
Are InSinkErator and Waste King interchangeable?
The disposals themselves fit the same standard 3.5-inch drain opening, but the mounting systems differ. InSinkErator uses a 3-bolt Quick Lock mount and Waste King uses EZ Mount (twist-lock). Switching brands means replacing the mounting ring, which adds 15-30 minutes to the installation. Our disposal installation guide walks through both mount types.
Which brand is quieter?
InSinkErator’s Evolution series with SoundSeal technology is quieter than any Waste King model. However, Waste King’s SoundSHIELD models (L-3200, L-5000TC, L-8000) are quieter than InSinkErator’s budget Badger series, which has no sound insulation at all. Noise depends more on the specific model than the brand.
Can I replace an InSinkErator with a Waste King?
Yes. The drain opening is the same 3.5 inches on both brands. You will need to swap the mounting hardware from 3-bolt to EZ Mount, which takes an extra 15-30 minutes. The Waste King 9980 model uses a 3-bolt mount and drops directly into an existing InSinkErator mount without changes.
Which brand lasts longer?
Both brands average 10-12 years with normal use. InSinkErator’s higher torque motors handle hard food waste slightly better, which can reduce wear. Waste King’s faster motors handle fibrous foods better, reducing jam-related stress. The biggest factor in disposal lifespan is not the brand — it is what goes down the drain. Avoid grease, fibrous vegetables in large quantities, and non-food items. Use our HP size guide to make sure you are not undersizing the unit for your household.