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Mercury Floor Machines H-21E Hercules Floor Machine โ€“ 21

Mercury Floor Machines H-21E Hercules Floor Machine โ€“ 21", 175 RPM, 108 lbs

Brand: Mercury Floor MachinesSKU: H-21EIn Stock – Ready to Ship
$1,989.00

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Mercury H-21E Hercules: 21" Super Heavy-Duty Floor Machine at 175 RPM

The H-21E is the largest apron size in the Hercules series โ€” a 21" machine built for industrial and institutional floors where machine weight, motor durability, and consistent pad pressure matter more than speed. At 108 lbs and 175 RPM, the H-21E delivers sustained downward force that lighter floor machines cannot replicate, which translates to more effective scrubbing, stripping, and carpet bonnet cleaning in a single pass.

H-21E Motor, Transmission, and Pad Specifications

  • Apron size: 21" โ€” the widest in the Hercules line, covering more area per pass than the 17", 19", or 20" models
  • Speed: 175 RPM โ€” standard single-speed for heavy-duty scrubbing, stripping, and buffing applications
  • Machine weight: 108 lbs โ€” heavier than the 17E (106 lbs), 19E (107 lbs), and 20E (108 lbs); weight provides passive pad pressure
  • Motor: 1.5 HP A/C dual-capacitor โ€” dual capacitors (start and run) reduce motor heat buildup under sustained load
  • Transmission: Triple-planetary gearbox โ€” three planetary gear sets in sequence reduce rotational speed from motor to pad while multiplying torque output
  • Included accessories: 19" pad driver and 18" rotary brush
  • Electrical: Draws up to 15A on two circuits; verify floor outlet capacity before use

Where the H-21E Hercules Fits in Commercial Cleaning

The H-21E is sized for large open-floor environments: manufacturing plants, distribution centers, hospital corridors wider than standard, gymnasiums, and airport concourses. The 21" apron at 108 lbs provides sustained downward pressure that strips finish layers, scrubs embedded soil from textured tile, and extracts surface moisture through carpet bonnets without requiring the operator to apply additional force. For facilities that have been running lighter machines โ€” 17" or 19" models in the 90 lb range โ€” the step up to 108 lbs is immediately noticeable in single-pass effectiveness. If the work environment has doorways or equipment aisles that limit machine width, the H-19E or H-17E are the narrower alternatives within the same Hercules motor platform.

Triple-Planetary Gearbox and Dual-Capacitor A/C Motor in Detail

The triple-planetary transmission in the H-21E uses three sequential planetary gear sets to step down the motor's high-RPM output to 175 RPM at the pad. Each stage multiplies torque, so the pad receives significantly more turning force than the motor generates directly. This is the mechanical reason heavy-duty rotary machines at 175 RPM can strip floor finish that a lighter or faster machine cannot: the pad is not spinning faster, but it is pressing and turning with more force. The dual-capacitor A/C motor adds a run capacitor to the standard start capacitor โ€” the run capacitor keeps the motor's power factor corrected during continuous operation, reducing heat and extending motor life under the sustained loads that stripping and heavy scrubbing generate. The H-21E draws up to 15A; facilities should confirm outlet capacity (two 15A circuits recommended for extended operation).

Specification Value
Model H-21E
Apron Size 21"
Speed 175 RPM
Machine Weight 108 lbs
Motor 1.5 HP A/C Dual-Capacitor
Amperage Draw Up to 15A (2 circuits)
Transmission Triple-Planetary
Pad Driver Included 19"
Rotary Brush Included 18"

Documents

Owner's Manual ยท Parts List ยท Sell Sheet ยท Wiring Diagram

Manufacturer's Warranty

This product comes with a full manufacturer's warranty. All warranty claims are handled directly by the manufacturer.

For specific warranty details, please contact us at +1 (978) 295-7538 or email info@uscleaningtools.com

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We supply contractors, restoration companies, property managers, schools, government agencies, and other tax-exempt organizations.

How to place a tax-exempt order:

  1. Write to us through our Contact Us page or email info@uscleaningtools.com and attach your valid tax exemption certificate (state resale or exemption certificate).
  2. We verify your certificate and mark your account tax-exempt — usually within one business day.
  3. Place your order and sales tax will not be charged.

For volume pricing or purchase orders, call +1 (978) 295-7538.

Shipping & Returns

Free shipping on most brands for orders over $300, delivered to the lower 48 states. Any brand-specific freight rate is shown at checkout before you pay.

Processing & delivery: in-stock orders are processed within 1–2 business days and typically deliver in 5–7 business days. Tracking is emailed within 24 hours of shipment. Built-to-order and backordered equipment shows its lead time on this page.

Freight deliveries: inspect your equipment on arrival and note any damage on the delivery receipt. Items damaged in transit or defective on arrival are fully covered at no cost to you.

Cancellations: cancel any time before your order ships for a full 100% refund.

30-day returns: return unused equipment in its original packaging within 30 days of delivery. Change-of-mind returns are subject to a restocking fee. To start a return, email info@uscleaningtools.com or call +1 (978) 295-7538.

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Frequently Asked Questions

How does the H-21E differ from the H-19E and H-20E in the Hercules series?
The H-21E uses a 21" apron and weighs 108 lbs โ€” the same weight as the H-20E but with a wider pad path. The H-19E weighs 107 lbs with a 19" apron, and the H-17E weighs 106 lbs with a 17" apron. All four machines share the same 1.5 HP dual-capacitor A/C motor and triple-planetary gearbox at 175 RPM. The 21" model covers more square footage per pass in open environments where machine width is not a constraint.
What pad sizes are compatible with the H-21E?
The H-21E ships with a 19" pad driver and an 18" rotary brush. The 21" apron size accommodates these accessories without pad contact with the apron skirt. Standard 19" floor pads โ€” stripping (black), scrubbing (green), cleaning (red), polishing (white/tan) โ€” all fit the included pad driver.
What does the dual-capacitor A/C motor provide over a single-capacitor motor?
A dual-capacitor motor uses a start capacitor to initiate rotation and a run capacitor to maintain power factor correction during continuous operation. The run capacitor reduces motor heat and current draw under sustained load โ€” relevant for stripping or scrubbing tasks that run continuously for 20โ€“60 minutes. Single-capacitor motors run hotter under equivalent sustained load and have shorter service intervals in heavy-use environments.
How much electrical capacity does the H-21E require?
The H-21E draws up to 15 amps under full load. Mercury recommends connecting to two 15A circuits for extended operation. Facilities with single 15A or 20A outlets can operate the machine on one circuit for most applications but should avoid sustained stripping work โ€” which draws peak amperage โ€” on a single circuit without first verifying the outlet's breaker capacity.
What is the triple-planetary gearbox and why does it matter for stripping?
The triple-planetary gearbox uses three sequential planetary gear sets to reduce the motor's high-RPM output to 175 RPM at the pad while multiplying torque at each stage. The result is that the pad turns slowly but with significantly more rotational force than a single-reduction gearbox can deliver. For stripping, this means the pad presses into the finish with enough torque to break the wax bond in one pass on most commercial-grade finish systems.
Can the H-21E be used for carpet bonnet cleaning?
Yes. The 108 lb machine weight and 175 RPM speed are appropriate for carpet bonnet cleaning. Use a cotton or microfiber bonnet pad (18" or 19" diameter) over the included pad driver. The machine weight provides sufficient contact pressure to transfer soil from the carpet fibers to the bonnet without requiring the operator to press down. Replace bonnets before saturation โ€” a fully loaded bonnet redistributes soil rather than removing it.

Frequently Asked Questions

1. What payment methods can I use?

We accept Visa, MasterCard, American Express, Diners Club, Discover, major debit cards, and digital wallets like PayPal, Google Pay, Meta Pay, and Apple Pay.

2. When will my payment be processed?

Your credit/debit card or PayPal account will be charged when you place your order. Secure payment processing protects your information.

3. Will I receive an order confirmation?

Yes, a confirmation email will be sent to the provided email address once the order is placed.

4. How long does it take to process an order?

Orders are processed within 1-2 business days and then prepared for shipment.

5. How long does it take for my order to arrive?

Estimated arrival time (ETA) is 5-7 business days for all orders.

6. Do you offer warranty?

All our products come with a manufacturer warranty of at least 1 year, depending on the brand.

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