Is a horizontal grinder more productive than a tub grinder?

On consistent feed, yes — horizontal grinders typically out-produce same-HP tub grinders by 20-40% because the feed roller controls hammer engagement. On bulky, irregular feed (stumps, root balls), tubs win because the open top lets you load with a loader bucket and the tub geometry holds material under the hammer.

What HP do I need for a horizontal grinder?

For mid-volume land clearing or mulch production: 600-800 HP (CBI 5800BT, Morbark 3800XL). For high-volume biomass or contracted grind operations: 1000+ HP (CBI Magnum, Morbark 6400XT, Peterson 5710D). Don't under-buy on HP — undersized grinders cost more per ton in fuel and downtime than they save in capital.

Can a horizontal grinder process stumps?

Yes, but it's slow and rough on hammers. If stumps are >30% of your feed, switch to a tub. If stumps are <10%, a horizontal with a stump-tooth pattern handles them fine — just feed slowly.

How long does a horizontal grinder hammer mill last?

Hammers themselves are wear parts — 300-1,500 hours depending on feed contamination. Hammer pins and shafts are rebuildable on a 5,000-10,000 hour cycle. Drum body is essentially a lifetime component on most major brands.

Is a tub grinder safer than a horizontal grinder?

Both have ejection risks — tub grinders are notorious for throwing material (stumps, rocks) up out of the tub if metal contamination causes a hammer break. Horizontal grinders contain ejecta better but the loading conveyor is its own pinch hazard. Either way: an overband magnet for tramp metal isn't optional.

Horizontal vs Tub Grinder: Which Is Right for Your Operation?

Q: How long does a horizontal grinder hammer mill last?

Hammers themselves are wear parts — 300-1,500 hours depending on feed contamination. Hammer pins and shafts are rebuildable on a 5,000-10,000 hour cycle. Drum body is essentially a lifetime component on most major brands.

Q: Is a tub grinder safer than a horizontal grinder?

Both have ejection risks — tub grinders are notorious for throwing material (stumps, rocks) up out of the tub if metal contamination causes a hammer break. Horizontal grinders contain ejecta better but the loading conveyor is its own pinch hazard. Either way: an overband magnet for tramp metal isn't optional.

Both reduce wood. Neither is universally better. Choose the wrong one and you fight the machine every day — feeding it wrong, breaking parts, hating life. Here's the broker breakdown of when each wins.

The basic geometry

A horizontal grinder feeds material in horizontally — usually via a powered conveyor and feed roller — through a high-speed rotating drum or hammer mill. The feed roller controls how aggressively the hammers engage the material. Output drops out the bottom onto a discharge conveyor.

A tub grinder has a large open-top tub (usually 8-12 ft diameter) with a rotating hammer mill at the bottom. You load material from above with a loader bucket. The tub rotates slowly to feed material into the hammers. Output discharges out a side conveyor.

Same goal, different feed mechanism. That's the whole story — and it determines which is right for your operation.

Where horizontal grinders win

Consistent throughput on uniform feed

If your material is reasonably consistent — pallets, mulchwood, brush, dimensional scrap — a horizontal grinder will out-produce a tub grinder of similar HP by a meaningful margin. The feed roller meters material into the hammers at the rate the engine can sustain. You run at peak load almost continuously.

Dirty or contaminated feed

Horizontal grinders handle mixed C&D wood, contaminated mulch, and pallet feed better than tubs. The feed roller and conveyor system give you a chance to spot contamination before it hits the hammers (overband magnets, pickers). Tubs hide their feed inside the tub geometry — by the time you see a problem it's already in the hammer mill.

Smaller footprint at high HP

At the high end (CBI Magnum, Morbark 6400XT, Peterson 5710D), horizontal grinders pack 1000+ HP into a footprint that fits a standard road trailer. Comparable-HP tub grinders are wider and harder to move.

Better for produced-product yards

Mulch yards, biomass-fuel producers, and pallet recyclers almost universally run horizontals. Operation runs continuously, feed is consistent, throughput per dollar matters.

Where tub grinders win

Stumps, root balls, and bulky brush

Land clearing operations are tub grinder territory. The open top lets a loader operator drop a 6-ft stump or a root ball straight in. A horizontal grinder requires you to break that stump down first — which means a second piece of equipment (excavator with a thumb, chainsaw work) before it ever hits the conveyor. On a real land-clearing job, the time differential is significant.

Mobility on rough job sites

Tracked tub grinders move around a job site easier than horizontals because they don't have a long discharge or feed conveyor to deploy. Set down, swing the discharge, grind, move 100 yards, repeat.

Lower upfront cost at mid HP

In the 400-600 HP range, used tub grinders are usually cheaper per HP than horizontals because the design is simpler. If you're an entry-tier operator getting into wood waste, a used Vermeer or Diamond Z tub at $80-120K can be a smart first machine.

Quick decision guide

If you can answer two questions, you can make the call:

What's your typical feed? Consistent (pallets, brush, dimensional wood)? → Horizontal. Bulky and irregular (stumps, root balls, large brush)? → Tub.
Where will it work? Fixed yard / produced product? → Horizontal. Job-to-job land clearing or storm cleanup? → Tub.

Borderline cases — mid-volume land clearing operators who also occasionally process contracted produced product — sometimes end up with both. Most operations specialize.

What to inspect when buying a used grinder

Same checklist applies to both types:

Engine hours and history. Tier 4 industrial diesels (CAT C18, Cummins X15) typically have 15,000-20,000 hour useful life. A 6,000-hour grinder with documented maintenance is a solid buy.
Hammer mill / drum condition.Hammers are wear parts (300-1,500 hr life). Pins, shafts, and the drum body are rebuildable. Look for excessive wear on the drum body itself — that's the expensive component.
Discharge conveyor. Belt condition, splice integrity, tail-pulley wear. Sometimes overlooked because the head turntable gets all the attention.
Magnet (overband or pulley).If the previous owner ran without one, the hammer mill paid the price. Verify it's present and functional.
Hydraulic system. Check for leaks at the main feed-roller cylinders (horizontal) or tub-rotation motors (tub). Hydraulic rebuilds are expensive.

Major brands and what we typically broker

On the horizontal side: CBI (Magnum, 5800BT, 6800BT) is the premium player; Morbark (3800XL, 6400XT) competes hard on price and parts availability; Peterson (4710B, 5710D) has loyal Pacific Northwest following.

Tub grinders: Vermeer (TG7000, TG9000) and Diamond Z (DZH4000, DZH5000) are the volume players; Rotochopper bridges into produced-product workflows with integrated coloring.

Bottom line

If you're processing consistent feed in a fixed yard, buy a horizontal grinder sized ~20% above your peak throughput target. If you're doing land clearing or storm work with bulky irregular feed, buy a tub grinder you can transport easily and load with the equipment you already own.

We move both. Tell us your operation profile and we'll match you to inventory or reach into our seller network. Browse current grinder inventory or tell us what you're looking for.