This page explains the schematic titled 2 Seats Walk-in Tub, Air + Hydro Therapeutic Massage + Hydro Foot + Microbubble Therapy + Heated Seat & Back with Digital Controller, the diagram Ella's Bubbles publishes for its two-seat walk-in tubs. It is the only two-seat diagram in the set, and it shows two foot pumps, two heat keypads and two HSB boxes, one per side, on three dedicated lines. The details below come from the schematic PDF (revision date 01-16-26) and from the printed Companion specification sheet.

The Only Two-Seat Diagram in the Set

Every other Ella therapy schematic is drawn around one bather. This sheet is drawn around two, and it duplicates the parts that belong to each bather while sharing the parts that belong to the tub. Shared: the digital controller, the master control box, the air pump, the seat jets hydro pump, the in-line water heater, the ozone generator, the LED light and the optional microbubble system. Per side: a foot jets hydro pump with its own air flow intensity dial, a Heat Keypad and an HSB (heated seat and back) box driving the surface heater pads on that seat.

Which Tubs It Lists

The diagram prints "Available On: Companion, Escape, Tub4two, Big4two," with microbubbles marked Optional. Companion and Escape have the inward-swing stainless-steel door; Tub4Two and Big4Two use the outward-swing U-shape door. All four share this therapy architecture. The two-seat tub comparison lays the four models side by side, and the Companion profile covers the model whose spec sheet is cited below.

The Ten Numbered Components

1. Air Massage System. Refer to the technical drawing for jet count; variable speed pump with auto purge; ON/OFF Digital Controller.
2. Seat Hydro Massage System. Hydro pump; hydro massage air flow intensity control; ON/OFF Digital Controller.
3. Foot Hydro Massage System. Hydro pump; hydro massage air flow intensity control; ON/OFF Button.
4. Infusion Microbubbles / Micro Bubble Therapy System (Optional). Microbubble pump; pressure vessel; ON/OFF Button.
5. In-Line Water Heater. Control Box.
6. Electronic Component Controller. Master Box.
7. Ozone Generator. Ozone sanitation system.
8. Led Light. Chromatherapy.
9. Surface Heater Pads. Heater pads.
10. Surface Key Pad. ON/OFF Push Button.

One Foot Pump, One Dial, One Heat Keypad and One HSB Box per Side

The diagram draws two foot-jet hydro pumps, one per seat side, each with its own air flow intensity dial, so each bather can set the foot massage they like. The in-line water heater sits on the second hydro loop. Each side also has its own Heat Keypad and HSB Box, and each HSB Box drives the Surface Heater Pads in that seat. The seat jets hydro pump, by contrast, is a single pump feeding the upper seat jets on both sides.

The Companion spec sheet confirms the layout from the jet side: 14 upper seat jets, 7 on each seat, on the seat hydro pump, and 4 foot and 2 calf jets on the foot and calf pump with on/off push control. The heated seat and backrest page explains how the pads behave in use.

The video tours the Big4Two and Tub4Two: independent foot and calf massage for each bather, air massage with auto purge, and hydro massage with in-line heater and dial.

Digital Controller for Air and Seat Hydro

On these two-seat models the air massage and the seat hydro massage are switched from the digital controller, which is wired to the master (control) box together with the LED light. Load 1 from that box is the air pump, marked Air Out to Jets, and Load 2 carries the other system loads; the ozone generator sends ozone out to the hydro system. The foot hydro massage and the optional microbubbles keep physical buttons; the microbubble path runs from its push control through a relay switch to the water pump, the MicroBubbles pressure tank and out to the jet. For a comparison of the two control styles see push controls versus digital touchpad.

Electrical Printed on the Diagram

Three dedicated lines is the key pre-installation question for a two-seat tub with the full package, compared with two on the single-seat tubs. The sheet adds: "Please View Specifications for Electrical Amperage (A), Voltage (V) and Wattage (W)." The Companion spec sheet prints those values as follows.

The spec sheet describes the equipment as 115V 60Hz and requires dedicated GFCI protected lines. Pump amperage can change with availability, so confirm with the team at (800) 480-6850 if the value must be exact. The electrical requirements by model page summarizes the whole lineup.

Why One Side Can Work While the Other Does Not

Because the foot pump, dial, Heat Keypad and HSB Box are duplicated per side, one seat can work while the other is quiet:

1. If only one side's foot massage runs, look at that side's foot pump and dial, not at the digital controller, which is shared.
2. If only one seat is warm, look at that side's Heat Keypad and HSB Box; the pads on each seat are driven independently.
3. If neither side's air massage or seat hydro starts, the shared digital controller, master control box and their dedicated line are the common factor.
4. If the tub trips a breaker when a second therapy is added, confirm all three dedicated 20 amp GFCI lines exist and no two cords share a circuit.

The two-seat tub, one side not working page walks through these checks in order. When you reach the team through ellasbubbles.com/support or (800) 480-6850, mention which side and which numbered component is involved.

Download the official document: 2 Seats Walk-in Tub, Air + Hydro + Hydro Foot + Microbubble + Heated Seat & Back with Digital Controller schematic (Companion, Escape, Tub4Two, Big4Two)

Common Questions