Does the heated seat need its own circuit, and can it be 15 amp?

No. The heated seat and backrest on an Ella walk-in tub is powered through the master control box, the blue box beside the motor, from a labeled port, so it never gets a wall circuit to itself. What it does change is the published line count: an air plus hydro tub needs one dedicated 20 amp, 120 volt GFCI protected circuit, and adding a heated seat moves the tub to two, as How Many GFCI Circuits Does My Walk-In Tub Need? explains. A 15 amp line can work on some lighter packages, but 20 amps is the published standard, and the 20 amp plug on some master control boxes will not fit a 15 amp receptacle at all.

Where the Heated Seat Gets Its Power

Every pump, heater and control box on an Ella walk-in tub is labeled at the factory, and the heated seat is not a separate appliance with its own cord to the wall. Its surface heater pads plug into the master control box, and the surface key pad, the push button that switches the heat on, connects to the same box. The master control box takes power at a single inlet and runs the air pump, the water pump, the LED chromatherapy light and the heated seat from labeled ports. A green light on the box shows that power is reaching it.

The master control box video on this page shows two of these boxes side by side. The presenter points to the heated seat connectors, the air pump and water pump ports, the nipples for the push button air hoses and the power inlet on each box. One box carries a standard three prong 15 amp plug, and the other carries a 20 amp plug with one blade turned sideways. That difference is the reason the amp question comes up so often after delivery.

On the fullest single-seat package, the digital controller sheet for the Transfer60, TransferXXL and Ultimate, the surface heater pads and the surface key pad, labeled Heat Keypad, are two of the ten numbered components, and the whole stack runs on two dedicated GFCI protected 20 amp, 120 volt lines. What the Full Digital Controller Package Schematic Shows walks through that sheet component by component.

How the Heated Seat Changes the Line Count

Ella publishes line counts by therapy package, never by model name. Each labeled cord on the tub needs its own dedicated 20 amp, 120 volt GFCI protected circuit that shares nothing with any other appliance, and on a two line tub the cord stickers read Line 1 20 Amp and Line 2 20 Amp. The table below collects the published counts.

For your electrician the takeaway is simple. If your order is air plus hydro with the heated seat option, plan for two dedicated 20 amp GFCI circuits rather than one. Which pump or box lands on which cord is set at the factory and printed on the cord labels and on your schematic, so there is no wiring decision to make inside the tub. The only site decisions are where the receptacles go and whether the GFCI protection sits at the breaker or at the receptacle; one or the other is sufficient. Landing both labeled cords on a single GFCI trips the breaker as soon as the second pump starts.

Can the Circuit Be 15 Amp?

The published standard is 20 amps on every dedicated line. The GFCI circuits guide allows that a 15 amp line can work on some lighter packages, and in the same breath lists a 15 amp line where 20 amps is specified as one of the likely causes of trouble. Two practical points decide it on a heated seat tub.

• The plug may not fit. Some master control boxes carry a 20 amp plug with one horizontal blade, and that plug needs a 20 amp receptacle. In the video the presenter holds up exactly that plug and says to ask for a 20 amp receptacle at the hardware or electrical store. If only one system runs after installation because its cord was the only one that fit, the fix is a 20 amp receptacle, never an adapter or an extension cord.
• The box that powers the heated seat also powers the pumps. The heater pads share the master control box with the air pump and the water pump, and the published requirement for every labeled cord is 20 amps. A 15 amp line where 20 amps is specified is a documented cause of trouble, so hold to 20 amps unless the team confirms otherwise for your specific package.

Before rough-in, ask the team at ellasbubbles.com/support or (800) 480-6850 to email the electrical diagram for your model and package. It shows the line count and the outlet location, so your licensed electrician can install the right receptacles the first time. Ella does not send technicians; the wiring is done by a local licensed electrician.

Placing the Outlets for a Heated Seat Tub

The receptacles belong under the seat area, inside or directly behind the equipment compartment, so the pump, heater and control box cords reach without extensions. Keep other appliances at least 3 feet from the tub. Put one GFCI on each line, at the breaker or at the receptacle, and do not double up. On a three pump tub the third pump is powered with the in-line water heater on a separate line, so there are more cords than control box ports; count the labeled cords, not the ports. Which Cord Plugs In Where on My Walk-In Tub? matches every cord to its outlet and shows the push button air hoses seating on the control box nipples.

The heated seat is also an option on the largest tubs. The ShaK spec sheet lists an optional heated seat and backrest below its two hydro pumps, air pump, in-line heater and microbubble system, and the ShaK and Big4One schematic already calls for three dedicated lines, labeled #1, #2 and #3, each 20 amp and 120 volt. What electrical circuits does the Ella ShaK need for all four therapies? and the Shak and Big4One digital schematic page cover those two tubs in detail.

Using the Heated Seat Once It Is Wired

Push the button once and the heated seat activates. Ella suggests turning it on 10 to 15 minutes before you enter the tub for maximum comfort. It turns off automatically after 20 minutes, and one more push turns it back on. The short heated seat video shows that sequence. If the seat never warms while the pumps run, check the green light on the master control box and the GFCI first, then confirm the heater pad connector is seated on its labeled port before opening a ticket with your serial number, therapy package and a photo of the control box with every cord visible.

Watch: Heated Seat Option for Your Walk-In Tub: Relaxed Bathing | Ella's Bubbles with chapters and a full transcript.

Related Guides

• Heated Seat and Back Not Warming Up: Checking the Control Box LED and the Button Prongs
• Heated Seat and Back: How It Works, Which Tubs Offer It, and How to Add It to Your Order
• What the Soaking + Heated Seat & Back Schematic Shows: Three Components, No Pumps, and the Only 15 Amp Callout

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