ER600 Super Waveless Softside Waterbed Mattress Bladder — Single or Dual

ER600 Super Waveless Softside Waterbed Mattress Bladder — S-Class Series

What is a Softside Waterbed? A softside waterbed bladder sits inside a foam rail system with a slanted inner edge — giving it the look and feel of a regular mattress while delivering the therapeutic benefits of a waterbed. Unlike a hardside waterbed, a softside fits inside any standard bed frame. However, the frame must be able to support the weight of a water-filled mattress — not all standard frames are rated for this. We offer compatible wood foundations and metal bed frames for customers who need a weight-rated option.

Softside bladders are designed specifically for softside foam rail systems and are not interchangeable with hardside bladders. Dimensions shown reflect the outside measurements of the complete bed system the bladder is designed to fit — not the bladder itself.

This listing is for the bladder only.

ER600 Specs

• Series: S-Class
• Wave Level: Super waveless — near-zero motion transfer; the highest wave reduction available in the S-Class softside lineup
• Construction: 24 mil purple PVC exterior; H-shaped foam insert providing lumbar support, wave reduction, and edge support; four layers of wave control fiber; 1/4" PE foam float layer allowing internal components to move freely within the bladder
• Best For: Sleepers who want the closest thing to a traditional mattress feel while still enjoying the therapeutic benefits of a waterbed

Single or Dual?

• Single: One full bladder — one heater, one temperature, one firmness level across the whole bed
• Dual: Two separate bladders (left + right side) with a foam divider included — allows each sleeper to set their own firmness and temperature independently
• ⚠️ Two heaters required for Dual: One heater per bladder, placed under the safety liner. A single heater spanning the gap between two bladders leaves an uncovered section that can overheat — potentially melting the liner and bladder, causing leaks, or starting a fire.

Warranty — S-Class Series

5-year full replacement / lifetime pro-rated replacement. Full warranty details →

New to Softside Waterbeds?

The bladder alone is not a complete sleep system. You’ll also need a foam rail and cover system for the bladder to function properly.

• Need just the rails and cover? Our Softside Waterbed Cover System includes foam rails, a cover, and a fitted safety liner — everything except the bladder.
• Want nearly everything in one order? Our HydroMattress Complete Waterbed System includes the ER600 bladder plus most accessories — the most complete waterbed package we offer online.

Recommended Accessories

• 8" Contour Safety Liner
• 8" Fitted Safety Liner (included with our softside cover systems — recommended for first-time buyers)
• Waterbed Heater Pad — Solid State 325W
• Softside Waterbed Foam Rails
• Fill & Drain Kit (R103)
• Water Mattress Conditioner (R55)

Hardside vs. Softside — What’s the Difference?

• Softside (this product): Fits any weight-rated standard bed frame, looks like a regular mattress, easier to move
• Hardside: Bladder sits inside a dedicated wooden waterbed frame, traditional look, classic wave feel

Bladder only. Foam rails, cover, heater, fill & drain kit, and conditioner sold separately.