ER400 Super Waveless Softside Waterbed Mattress, with Back Support Deep Fill (8")- 2nd most waveless
ER400 Super Waveless Softside Waterbed Mattress, with Back Support Deep Fill (8")- 2nd most waveless
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Sterling Sleep Systems
ER400 Super Waveless Softside Waterbed Mattress — S-Class Series
The ER400 is a bladder only — a cover system is required to complete your softside waterbed setup. Choose from our Plush Top, Pillowtop, or Euro Top cover systems, sold separately.
ER400 Specs
- Series: S-Class
- Fill: Deep Fill — 8"
- Wave Level: Super Waveless — 2nd most waveless softside bladder
- Key Features: Three lumbar support layers, four full-size 1.5 oz. fiber layers, tethered wave control
- Best For: Sleepers who want superior back support and near-zero motion transfer
Warranty — S-Class Series
Covers seam and valve related leaks from date of purchase:
- Years 1–5: Full replacement (excluding shipping)
- Lifetime: Pro-rated/discounted replacement (excluding shipping)
What Makes the ER400 Special
Three layers of lumbar support cradle the natural curvature of your spine to eliminate sleep-related back pain. Four full-size 1.5 oz. fiber layers envelop the water bladder for structure, stability, and dreamy comfort. Unlike foam or spring mattresses, a waterbed never loses its support over time — the comfort you feel night one is the same you’ll feel 15 years later.
Recommended Accessories
*Cover system, heater, fill & drain kit, and conditioner sold separately.
United StatesAmazing product
The product and customer service are top notch! If you are looking for a water bed product, this is the place to go!
United StatesBeyond Comparison
There is no comparison to a Sterling Softside. We have tried multiple brands (and types) of sleep systems. By far, Sterling Softside waterbed mattress outweighs any type of mattress system. This is our second order due to age of our first mattress system. Once you sleep on a Sterling waterbed, there is no return to a regular mattress. The back support is beyond imaginable. I have high body heat when sleeping. The Sterling Waterbed system zeroes this issue out which makes sleeping at night quite snug.
United StatesKing Waterbed
Excellent experience from setup to sleeping! Had a soft side waterbed 8 years ago & loved it. So after experiencing the memory foam, decided to go back to a waterbed. Anton was very helpful with answering my questions & recommending the right choice in our bed. Thank you!!
United Statesreview if super waveless softside waterbed mattress(s)
I like the mattress and customer service was very quick and courteous. I ordered two new mattress bladders and received them within two days. The reason that I had to order the bladders was that one sprung a leak and I have no idea how or where it was. I only know it sprang a leak because the liner did not hold the leaked water and the frame was wet. The sterling system is good - if it didn't spring a leak. Mattresses were about 4-5 years old.
United Statesvery satisfied
Having waterbed for well over 30 years, I am very satisfied with this ER400, it's firm and waveless.