Big4One vs Big4Two: Walk-In Tub Comparison
The Ella Big4One and the Ella Big4Two 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 | One bather | Two bathers |
| Actual size (W x L x H) | 33 1/8" x 66" x 39.5" | 36" x 80" x 40" |
| Seat | 24" x 21 1/4 in. | 22" and 24" |
| Interior length | 58 in. | 37 3/8 in. (chart) |
| Seat to overflow (soaking depth) | 22 in. | 19 1/4 in. |
| Seat to footwell | 17 in. | 17 in. |
| Footwell | 20 W by 17 L | not listed |
| Net weight | 271 lb | 328 lb |
| Shipping weight | 400 lb | 531 lb |
| Crate size (W x L x H) | 36" x 68" x 49" | 38" x 82" x 50" |
| Water to overflow, unoccupied | 127 gal | 145 gal |
| Water with a bather (typical) | 75-100 gal | 85-135 gal |
What is different
- The Big4Two is 2 7/8 in. wider than the Big4One (36 in. vs 33 1/8 in.).
- The Big4Two is 14 in. longer than the Big4One (80 in. vs 66 in.).
- The Big4Two is 0 1/2 in. taller than the Big4One (40 in. vs 39 1/2 in.).
- They share the same door design: u-shape outward-swing door.
- The Big4Two seats two bathers; the Big4One is a single-seat tub.
- To the overflow, the Big4One holds about 127 gallons and the Big4Two about 145, which matters for water heater sizing.
- Net weights are 271 lb (Big4One) and 328 lb (Big4Two).
Common questions
Which is bigger, the Big4One or the Big4Two?
The Big4Two has the larger footprint at 36" x 80" x 40", against 33 1/8" x 66" x 39.5" for the Big4One.
Do the Big4One and the Big4Two 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 Big4One and the Big4Two hold?
To the overflow when empty, the Big4One holds about 127 gallons and the Big4Two about 145 gallons; with a bather the typical ranges are 75-100 and 85-135 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 Big4One 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