Lavina L20S7 Electric Concrete Floor Grinder

A 20″ Electric Workhorse for Professional Floor Prep

The Lavina® L20S7 is the professional-grade electric grinder in the S7 lineup — a 7.5 HP planetary machine that packs real production power into a compact 20-inch footprint. It’s built for the medium-sized floor projects that make up the bulk of a contractor’s work: prepping for epoxy and coatings, removing glue and adhesives, grinding down high spots, and polishing concrete to a finished shine.

Unlike the lighter, single-speed L19S7, the L20S7 offers variable tool-holder speed (400–1100 RPM) and far more grinding pressure, so you get the control and muscle to move from aggressive prep to fine polishing with one machine. And because it’s available in both single-phase and three-phase (200–240V), you can match it to the power you have on site. For contractors who want serious electric grinding performance without stepping up to the big propane machines, the L20S7 hits the sweet spot.

Ready to put the L20S7 to work? Call for pricing and availability, or request a quote — and you’ll talk to a real surface-prep expert, not a call center.

Speak directly with a surface preparation expert — fast answers and real recommendations.

New to grinders? Read our guide on choosing the right one!

New Sealed & Dust-Proof Grinding Head

Longer service life and less maintenance:

• Completely redesigned chain-driven planetary drive
• New stronger timing belt
• Upgraded shafts, seals, and bearings
• New lighter timing pulleys for better power transmission
• New 2-piece aluminum main belt housing with belt inspection cover for longer belt life and less maintenance

NEW FRAME DESIGN

• Better control, easier tool changes, and less vibrations.
• New weights for faster position change
• Redesigned frame allowing easier tool changes
• New ergonomic handle design with more positions
• Rubber bushing used at head attachment points for less vibrations for user

SPECIFICATIONS

• Motor: 7.5hp / 5.5 kw
• Voltage (50-60hz): 1 or 3 ph, 200-240V, 30A
• Weight of Machine: 518 lbs
• Grinding Pressure: 242 – 309 lbs
• Tool Holder RPM: 400-1100 rpm
• Working Width: 20″
• Tool Holder Diameter: 3×9 in
• Heads Rotation: Counterclockwise
• Vacuum Hose Port: 50mm pip
• Water Tank Capacity: 2.1 gal
• Machine Dimensions (LxWxH): 86x32x46 in
• Grinder Series: S7
• Grinder Type: Planetary

What the L20S7 Is For

• Medium-sized floor prep and polishing projects
• Surface prep for epoxy and coatings
• Glue, adhesive, and coating removal
• Grinding and polishing with variable speed control
• Both single- and three-phase power — match it to your site
• Wet or dry operation with the built-in water tank

Frequently Asked Questions

What is the Lavina L20S7 best for? Professional, medium-sized floor projects — prep for epoxy and coatings, glue and adhesive removal, grinding, and polishing. Its variable speed and strong grinding pressure let one machine handle both aggressive prep and fine polishing.

What power does it need? 200–240V, 30A, available in single-phase or three-phase — so you can match it to the power available on your job site.

How is it different from the L19S7? The L19S7 is a lighter, single-speed 115V machine for small jobs, rentals, and tight spaces. The L20S7 is a heavier, 7.5 HP variable-speed machine with far more grinding pressure — built for professional, medium-sized floors.

Does it have variable speed? Yes — tool-holder speed is adjustable from 400 to 1100 RPM, giving you control across grinding and polishing steps.

Does it work wet or dry? It has a 2.1-gallon water tank for wet grinding and polishing, and can run dry with proper dust collection.

What tooling does it use? Lavina-compatible planetary tooling. See our Lavina grinder accessories and planetary tooling.

Should I get the electric L20S7 or the propane L20GS7? Both are 20″ machines. The L20S7 is electric — quiet, no emissions, ideal for indoor work with adequate power. The propane L20GS7 is cord-free and runs anywhere, ideal for large areas and sites without power. We’ll help you choose based on your typical jobs.

Why Buy Your Lavina from Substrate Technology?

When you buy the L20S7 from us, you’re getting more than a machine. Our technicians are Lavina-certified, we stock parts and tooling, and we back every machine with real surface-prep expertise — so you have genuine support long after the sale. We’ll help you choose the right machine, the right tooling, and the right dust collection for your work, and we’re here when you need parts or service. You’ll always talk to a real expert, not a call center.

Complete Your Setup

• Lavina grinder accessories — OEM and non-OEM options
• Planetary tooling — to fit the L20S7
• Dust collectors — pair with the right collector for silica-safe grinding

Order Your Lavina L20S7 Today

Call (815) 941-4800 x 1 or fill out our contact form. See all our Lavina grinders and planetary floor grinders.

Item #303604020