Volt FX-4 vs FX-8: Which Cordless Pool Vacuum Is Right for You?

If you’re shopping for a cordless, rechargeable pool vacuum, chances are you’ve come across the Water Tech Volt FX-4Li and the Volt FX-8Li. Both models are best-sellers—and for good reason. They’re powerful, convenient, and designed to make pool maintenance simple. But they’re built for different jobs.

In this guide, we’ll compare the FX-4 vs. FX-8, so you can decide which one is the best fit for your pool.

FX-4Li vs. FX-8Li: Quick Overview

• Water Tech Volt FX-4Li: Lightweight, compact, and perfect for spas, hot tubs, and small pools.
• Water Tech Volt FX-8Li: Larger, more powerful, and designed for in-ground or above-ground pools of any size.

Power and Runtime

Both units are rechargeable and powered by lithium-ion batteries, but the FX-8 delivers more cleaning strength.

• FX-4Li Power Rating: 275
• FX-8Li Power Rating: 500

When it comes to runtime, you’ll get:

• FX-4Li: Up to 45 minutes per charge
• FX-8Li: Up to 60 minutes per charge

That extra power and longer runtime make the FX-8 especially useful for larger pools that need more coverage.

Size and Cleaning Coverage

Size plays a big role in how efficiently each vacuum cleans.

• FX-4Li Dimensions: Just over 20 inches long, weighing only 3.4 lbs with a 7.5-inch vacuum head. Easy to maneuver in tight spaces.

• FX-8Li Dimensions: 5.55 lbs, with a 13-inch wide vacuum head—nearly double the coverage of the FX-4.

If you want fast cleaning in big pools, the FX-8’s larger vacuum head is a game changer.

Features and Accessories

Both vacuums include two reusable filter bags: an all-purpose bag and a multilayer Xtreme filter for finer particles.

The FX-8Li goes a step further with:

• A crevice corner nozzle
• Built-in scrubbing brushes
• A head and hose attachment for shallow water
• A 30% larger debris chamber

Both models feature simple push-button operation—just press and go.

Minimum Depth and Warranty

• FX-4Li Minimum Depth: 12.25 inches
• FX-8Li Minimum Depth: 14.25 inches

And both come with a 2-year limited warranty for peace of mind.

Which One Should You Choose?

• Choose the Volt FX-4Li if you have a spa, hot tub, or small pool and want something light, compact, and easy to use.
• Choose the Volt FX-8Li if you have a larger pool and want more suction power, more features, and faster cleaning capacity.

Shop Water Tech Vacuums at EZ Pool & Spa Supply

At EZ Pool & Spa Supply, we carry both the Volt FX-4Li and the Volt FX-8Li, ready to ship. Not sure which one is best for your pool? Our team is happy to help you find the right fit.

Browse our full selection of pool vacuums today and make pool cleaning easier than ever.