WasteMaid Pro 459, 1/3 HP Garbage Disposal Review

A rental unit, a small apartment kitchen, a secondary sink in a laundry room, these are the places where a 1/3 HP disposal actually makes sense, and where paying for more motor than you’ll use is just money left on the table. The WasteMaid Pro 459 is built for exactly that scenario.

This is the 1/3 HP entry in WasteMaid’s Pro lineup, sharing the same Speed Master mounting system and Bio Shield antimicrobial odor protection found on the larger Pro 659, just scaled down to a smaller motor and a lower price point. The WasteMaid Pro 459 isn’t trying to compete with heavier-duty disposals on grinding power. It’s built to install fast, stay odor-free, and handle the kind of light daily waste a smaller kitchen actually produces.

This review covers how the 459 performs at 1/3 HP, what carries over from the Pro 659, and whether the lighter motor is enough for your kitchen.

WasteMaid Pro 459, 1/3 HP Anti-Jam Garbage Disposer Specifications

Specification	Details
Brand	WasteMaid Pro
Model Number	10-US-WMP-459
Horsepower (HP)	1/3 HP
Motor Type	2400 RPM Motor
Feed Type	Continuous Feed
Grinding Components	Stainless Steel, Anti-Jam Impellers
Mount Type	Speed Master Mounting System
Voltage	115V AC
Product Dimensions	7 × 7 × 14 inches
Item Weight	8.89 lbs
Color / Finish	Black
Included Components	Disposer, Power Cord (pre-connected), Flange, Elbow Kit
Special Features	Bio Shield Antimicrobial Protection, Torque Master Balanced Grinding System, Corrosion-Proof Grinding Chamber
Septic Safe	Yes (per manufacturer guidelines)
Warranty	5-Year Limited Warranty plus Lifetime Corrosion Warranty (per WasteMaid Pro’s official warranty terms)

WasteMaid Pro 459, 1/3 HP Anti-Jam Garbage Disposer Key Features

1/3 HP Motor Built for Light, Everyday Waste

The WasteMaid Pro 459 runs at 2400 RPM, a notch below the 2600 RPM motor on the Pro 659, matching its lower 1/3 HP rating. This is a disposal sized for coffee grounds, rinsed plate scraps, and soft food waste, the kind of load a single person, a couple, or a lightly used secondary kitchen generates day to day.

Push it toward heavier or more fibrous waste and it will ask for smaller, slower batches, which is normal for any 1/3 HP motor regardless of brand. That’s the tradeoff for a smaller, lower-cost unit rather than a shortfall specific to this model.

Speed Master Mounting System

Like the rest of the Pro line, the 459 uses WasteMaid’s Speed Master mount instead of the standard 3-bolt system found on the brand’s regular WM-series disposals. The design is built around minimal tools and a faster install, which matters if you’re doing the replacement yourself rather than calling a plumber for what should be a straightforward swap.

One thing worth checking first: since the mounting hardware differs from the standard 3-bolt WM line, confirm compatibility with your existing sink flange setup before you buy, especially if you’re replacing an older 3-bolt unit and hoping to reuse part of the existing mount.

Bio Shield Antimicrobial Odor Protection

The grinding chamber includes the same Bio Shield antimicrobial protection found on the Pro 659, engineered to cut down on the odor-causing bacteria that build up in a disposal over weeks of regular use. On a smaller, lower-power unit like this one, where waste can sit in the chamber a little longer during heavier grinding cycles, that odor control matters just as much, if not more.

Anti-Jam Stainless Steel Impellers and Torque Master Grinding

Grinding runs through the Torque Master balanced grinding system, paired with anti-jam stainless steel impellers rather than fixed grinding lugs. The balance in the turntable and armature is what keeps vibration and noise down, and it’s also what keeps a tough scrap from locking up the whole unit rather than just working around it.

Every component that touches food waste is stainless steel, resisting the corrosion that eventually degrades cheaper galvanized alternatives on other budget-tier disposals.

Sound Insulation

The housing includes sound insulation, consistent with the rest of the Pro line. For a 1/3 HP disposal likely to end up in a smaller kitchen or an apartment with thinner walls, keeping the operating noise contained is a genuinely useful design choice rather than an afterthought.

Installation and What’s Included

The box includes the disposer itself, a pre-connected power cord, a mounting flange, and an elbow kit, covering what a standard plug-in installation needs without a separate hardware purchase. Combined with the Speed Master mount, this is built to get a smaller kitchen back in service quickly.

Maintenance

The motor is permanently lubricated, so skip any attempt to oil it yourself. Run cold water while grinding to keep grease and fats solid enough to flush through the line rather than coating the chamber, and avoid lye based or chemical drain cleaners entirely, since corrosion damage from those products typically isn’t covered under warranty.

Daily Use Experience

For the kitchen this is built for, the WasteMaid Pro 459 does what a 1/3 HP disposal should: clear routine scraps without drama, install quickly thanks to the Speed Master mount, and stay noticeably less smelly than a standard chamber thanks to Bio Shield. It’s not a unit built to impress with power, it’s built to disappear into daily use in a kitchen that doesn’t need much of it.

Warranty

WasteMaid Pro backs the 459 model with a 5-year limited warranty, the same term as the larger Pro 659, according to the brand’s official warranty documentation. A separate lifetime warranty against corrosion failure applies on top of that base coverage. As with the 659, Amazon’s own listing for this model doesn’t display the warranty term directly and instead points buyers to request it from customer service, so it’s worth confirming before you complete a purchase.

WasteMaid Pro 459, 1/3 HP Anti-Jam Garbage Disposer Pros and Cons

WasteMaid Pro 459 vs the Pro 659

Feature	WasteMaid Pro 459	WasteMaid Pro 659
Motor Power	1/3 HP	1/2 HP
Motor Speed	2400 RPM	2600 RPM
Item Weight	8.89 lbs	9 lbs
Product Dimensions	7 × 7 × 14 inches	7 × 7 × 13.75 inches
Bio Shield Protection	Yes	Yes
Warranty	5 Years plus Lifetime Corrosion	5 Years plus Lifetime Corrosion
Best For	Light use, apartments, secondary sinks	Everyday household use with a bit more grinding power

Further Reading:
WasteMaid Pro 659 1/2 HP Garbage Disposer
Evergrind E101 1/3 HP Garbage Disposal
InSinkErator Essentials ES30 1/3 HP Garbage Disposal
KRAUS WasteGuard 1/3 HP Ultra-Quiet Garbage Disposal

Conclusion

The WasteMaid Pro 459 is a straightforward pick for a kitchen that doesn’t need much grinding power but still wants a fast, tool-light installation and a chamber that won’t hold onto odors between uses. The Speed Master mount and Bio Shield protection carry over from the Pro 659 without a compromise, just scaled to a smaller motor.

If your household generates more than light daily waste, the step up to the 1/2 HP Pro 659, or one of Waste Maid’s standard-tier disposals, makes more sense. But for an apartment, a rental, or a secondary kitchen sink, the WasteMaid Pro 459 covers the job without asking you to pay for power you won’t use.