The Mercury 21-inch Hercules Floor Machine (H-21E) is a 175 RPM low-speed single-disc machine built for janitorial crews, floor care contractors, and facility maintenance teams that strip, scrub, bonnet, and shampoo large hard floor areas. The all-metal chassis adds the weight that does the actual work on a low-speed machine, and the 1.5 HP, 66-frame A/C motor with a triple planetary transmission delivers the torque needed for daily stripping and aggressive scrubbing without bogging down.
Use cases
The H-21E is the workhorse choice for medium-to-large hard floor accounts. School hallways and gymnasiums get stripped and recoated annually with a 21-inch machine because the increased pad area finishes the job in a single shift. Big-box retail and grocery store aisles use it for nightly scrubbing on VCT. Healthcare facilities run it on the long corridors between patient rooms. Floor care contractors taking on multi-tenant office buildings, banks, and warehouses standardize on a 21-inch machine because the productivity gain over a 17-inch is significant on open floors. The Hercules also handles bonneting on commercial carpet at slow speed, useful for interim maintenance between deeper extractions.
Why the all-metal chassis matters
On a 175 RPM single-disc machine, weight is what does the cleaning. A heavy chassis presses the pad or brush into the floor uniformly so the cleaning chemistry can break the soil bond. Plastic-bodied machines flex under load and put uneven pressure on the pad, which leaves swirl marks on stripping jobs and uneven scrubbing on burnish prep. The Hercules chassis is steel, which is also why it carries a five-year warranty on the motor and gearbox -- the chassis is not the failure mode.
Specifications
- Machine size: 21 inches
- Speed: 175 RPM (low speed)
- Motor: 1.5 HP, 66-frame A/C
- Transmission: triple planetary high torque
- Power cable: 50-foot safety cable
- Triggers: non-conductive dual triggers (shock-resistant)
- Switch: safety-enhanced interlock; both hands stay in control
- Wheels: non-marking, fixed 6-inch transport wheels
- Bumpers: non-marking full wrap (protects floors, walls, baseboards)
- Maintenance: motor plugs in at handle base for easy service
- Warranty: five-year manufacturer warranty on motor and gearbox
- Pad / brush: sold separately. Run 19-inch pads with a pad driver, or 19-inch brushes
- Pad driver note: if using a pad driver with riser, use brushes without risers (and vice versa)
- Now includes 1305-T (plastic version of 1305) where applicable
Frequently asked questions
What is the H-21E used for?
The H-21E is a 21-inch, 175 RPM single-disc floor machine used for scrubbing, stripping, buffing, and bonneting hard floors. Janitorial crews and floor care contractors use it on VCT, sealed concrete, terrazzo, marble, and ceramic tile. The 1.5 HP motor and triple planetary transmission give it the torque needed to handle heavy stripping with abrasive pads.
What size pad or brush should I run on a 21-inch machine?
On the H-21E, you run a 19-inch pad with a pad driver, or a 19-inch brush -- two inches smaller than the 21-inch machine size. If you use a pad driver with a riser, use brushes without risers. Mixing two riser-equipped accessories on the same machine puts the wrong pressure on the floor and the gearbox.
Is the H-21E a stripper, a scrubber, or a buffer?
At 175 RPM it is a low-speed (sometimes called a swing) machine, which is the right speed for stripping floor finish, scrubbing with cleaning solution, and bonneting carpet. Burnishing or polishing for high gloss requires a high-speed machine in the 1500 to 2000 RPM range -- the H-21E will not produce a wet-look shine.
What is the warranty?
Mercury covers the motor and gearbox on the Hercules series for five years -- the strongest warranty in the segment. Components, switches, and the cable carry shorter warranty terms; full details are in the manufacturer warranty.
Why a 21-inch machine instead of a 17-inch?
A 21-inch machine covers about 50 percent more square footage per pass than a 17-inch machine, which makes it the right choice for large open floors -- school hallways, big-box retail, warehouses, and hospital corridors. A 17-inch machine still has its place in cluttered office spaces or restrooms, where a smaller turning radius is more important than throughput.
Discount Cleaning Products is an authorized Mercury Floor Machines dealer with a US-based customer service team. We can help match the H-21E to the right pad driver, brush, and accessory bundle for your account mix.
