Big4Two vs Shak: Walk-In Tub Comparison
The Ella Big4Two and the Ella Shak side by side, using the actual dimensions from the spec sheets and technical drawings rather than nominal sizes. The profiles cover therapy packages, videos and installation notes for each tub.
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| Door style | U-shape outward-swing door | U-shape outward-swing door |
| Door swing | Outward | Outward |
| Seats | Two bathers | One bather |
| Actual size (W x L x H) | 36" x 80" x 40" | 36" x 72" x 39" |
| Seat | 22" and 24" | 28" x 26 3/4 in. |
| Interior length | 37 3/8 in. (chart) | 66 1/4 in. |
| Seat to overflow (soaking depth) | 19 1/4 in. | 16 1/2 in. |
| Seat to footwell | 17 in. | 17 in. |
| Footwell | not listed | 22 1/2 W by 14 1/2 L |
| Net weight | 328 lb | 286 lb |
| Shipping weight | 531 lb | 429 lb |
| Crate size (W x L x H) | 38" x 82" x 50" | 39" x 74" x 49" |
| Water to overflow, unoccupied | 145 gal | 145 gal |
| Water with a bather (typical) | 85-135 gal | 80-120 gal |
What is different
- Both are 36 in. wide.
- The Big4Two is 8 in. longer than the Shak (80 in. vs 72 in.).
- The Big4Two is 1 in. taller than the Shak (40 in. vs 39 in.).
- They share the same door design: u-shape outward-swing door.
- The Big4Two seats two bathers; the Shak is a single-seat tub.
- Both hold about 145 gallons to the overflow when empty.
- Net weights are 328 lb (Big4Two) and 286 lb (Shak).
Common questions
Which is bigger, the Big4Two or the Shak?
The Big4Two has the larger footprint at 36" x 80" x 40", against 36" x 72" x 39" for the Shak.
Do the Big4Two and the Shak have the same door?
Yes. Both use the u-shape outward-swing door, so the same operation, seal and latch guides apply to either tub.
How much water do the Big4Two and the Shak hold?
To the overflow when empty, the Big4Two holds about 145 gallons and the Shak about 145 gallons; with a bather the typical ranges are 85-135 and 80-120 gallons. Size your water heater to the larger figure.
Can two people bathe in the Big4Two?
Yes. The Big4Two is a two-seat tub; the Shak seats one bather.
Read the full profiles
Add a third model to this comparison → · Dimensions by model · Which door does my tub have?
Want help choosing?
Your Ella dealer or the team at (800) 480-6850 can walk you through both tubs for your space and needs.
Videos