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What Are the Acrylic Shell and Stainless Steel Frame on a Walk-In Tub?

Updated September 2026

The acrylic shell and stainless steel frame are the construction of every current Ella walk-in tub: a vacuum-formed acrylic and ABS shell reinforced with gel-coated fiberglass, bonded to a rust-proof stainless steel frame with adjustable leveling legs. The acrylic gives a gloss white, non-porous bathing surface that resists mold, mildew and staining, and the stainless frame carries the pumps and plumbing and spreads the weight of tub, water and bather to the floor.

Underside of an Ella walk-in tub showing the stainless steel frame, leveling legs and fiberglass-backed acrylic shell
Under the shell: the stainless steel frame with leveling legs, bonded to the fiberglass-backed acrylic.

How It Works

A solid acrylic/ABS sheet is heated and vacuum-formed over the mold into one seamless surface. Gel-coated fiberglass is applied to the back for strength, the shell is set on the stainless frame, and further fiberglass layers bond shell and frame into a single structure. The team describes the acrylic as roughly 1/8 to 3/16 inch thick with the fiberglass backing behind it. Because the white runs through the sheet rather than sitting on top, it resists fading far better than a sprayed gel coat finish, and the non-porous surface wipes clean. Threaded leveling feet let the installer level the tub on an imperfect floor, and larger tubs add center legs so the frame cannot twist while the pumps run. The full story is in acrylic construction and frame.

Which Ella Models Have It

Every current Ella walk-in tub, from the Petite to the two-seat models and the LayDown line, uses the acrylic shell on a stainless steel frame. Every tub is white; the warranty page notes that the white acrylic tone may vary slightly, and an off-white unit occasionally appears on clearance. Hardware is chrome, with faucet finish upgrades covered in tub colors and hardware finishes.

What to Know as an Owner

There is no set bather weight limit. The frame transfers load to the floor across every leveling leg, so fit comes down to seat width and soaking depth rather than a weight rating; the wide-seat models are listed in weight limits and bariatric options. Lift the tub only by the frame, never by plumbing or panels, since air jets on the underside break off if the tub is set down on them. For care, use approved non-abrasive cleaners, avoid bleach and bath bombs, and bring back dull spots or light scratches with a fine-grade automotive polishing compound; never use abrasives. The method is in acrylic surface care and touch-up, and discoloration is covered in tub looks pink, yellow or stained. Grab bars must go in with the large metal washer under the shell, since omitting it can crack the acrylic. For a ticket about the surface or frame, have your serial number, close-up photos in good light and a note of what cleaners were used ready.

Video
Chapters in this video
  1. 0:00 Ella's Bubbles Stainless Steel Frame The video introduces the Ella's Bubbles walk-in tub frame, which is made entirely of polished stainless steel.
  2. 0:44 Competitor Steel Frame Tubs The video shows a competitor's walk-in tub with a basic steel frame and torsion bars for door leak adjustments.
  3. 1:48 Competitor Aluminum Frame Tubs The video displays another competitor's walk-in tub with an aluminum frame, also featuring torsion bars to adjust for leaks.
  4. 2:32 Ella's Bubbles No Torsion Bars The video reveals the Ella's Bubbles walk-in tub without its panels, showing no torsion bars or adjustments for door leaks.

Watch: Walk-In Tub With Rustproof Frame for Extended Lifespan u2013 Voted Best/Safest 2020 with chapters and a full transcript.

Common Questions

Is an Ella walk-in tub acrylic or fiberglass?
Every current Ella walk-in tub, from the Petite to the two-seat models and the LayDown line, uses both acrylic and fiberglass in its construction. The bathing surface is a vacuum-formed acrylic and ABS shell, which is then reinforced with gel-coated fiberglass for added strength. This entire shell is then bonded to a rust-proof stainless steel frame, creating a single, durable structure.
How thick is the acrylic on an Ella tub?
The acrylic on an Ella walk-in tub is roughly 1/8 to 3/16 inch thick, with a gel-coated fiberglass backing behind it for strength. This solid acrylic/ABS sheet is heated and vacuum-formed over a mold into one seamless surface. Because the white color runs through the entire sheet rather than sitting on top, it resists fading far better than a sprayed gel coat finish.
Is there a weight limit on a walk-in tub?
There is no set bather weight limit for an Ella walk-in tub. The rust-proof stainless steel frame is designed to carry the pumps and plumbing and spreads the weight of the tub, water, and bather to the floor across every adjustable leveling leg. Fit comes down to seat width and soaking depth rather than a weight rating, so if the bather fits comfortably in the seat, the reinforced shell and stainless frame will support them on a level, load-rated subfloor.
Will the stainless steel frame rust?
No. The frame is stainless steel and rust-proof. If you ever notice rust-colored spots on stainless trim, send photos with your serial number through a ticket and the team will advise on the cause and the safe way to clean it.
How do I fix a scratch or dull spot on the acrylic?
Buff light scratches and dull spots with a fine-grade automotive polishing compound and never use abrasive cleaners. Small chips can be handled with an acrylic bathtub repair kit, and a local refinisher can address deeper damage.

For anything specific to your model or serial number, open a ticket at ellasbubbles.com/support or call (800) 480-6850.

About this guide. Answers in the Ella’s Bubbles Support Center are compiled from real conversations with tub owners, our technicians’ notes and the product documentation, then reviewed by our team. Tub models and options have evolved over the years, so a detail here may differ slightly from your exact tub. If something looks different on yours, send us your serial number and a specialist will confirm it for your model.

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