Does a Walk-In Tub Heated Seat Need Its Own Circuit, and Can It Be 15 Amp?

The heated seat and backrest on an Ella walk-in tub does not get a private circuit of its own. Its heater pads plug into the tub's master control box, which powers them alongside the pumps and the light it controls. What the option does change is the tub's line count: Ella's published counts put the heated seat variants at two dedicated lines, and each line is a 20 amp, 120 volt GFCI protected circuit, so 20 amps is the figure to plan for, not 15. How Many GFCI Circuits Does My Walk-In Tub Need? gives the rule for the whole line, and this page looks at the heated seat on its own.

How the Heated Seat Gets Its Power

The heated seat and backrest is an optional comfort accessory made up of surface heater pads behind the tub surface and a button or keypad that switches them on. The pads do not have a wall plug of their own. They connect to a labeled port on the master control box, the blue box that sits by the motor in the equipment compartment.

The master control box takes power at its inlet and feeds the air pump, the water pump, the LED light and the heated seat from its labeled ports. A green light on the box shows that power is reaching it. The Master Control Box Explanation video on this page shows this directly. The presenter points out the port where the heater pads connect, the port for the air pump, the port for the water pump and the power input, and explains that these boxes are called master control boxes because they control the massage systems and include the heated seat.

The published schematics draw it the same way. On the sheet for the fullest single-seat package, the heated seat appears as two numbered components, Surface Heater Pads and a Surface Key Pad labeled Heat Keypad, tied into the Master Box. The walkthrough of the full digital controller package schematic covers that sheet, which lists the Transfer60, TransferXXL and Ultimate.

So the question to ask is not whether the heated seat needs a circuit, but how many dedicated lines your whole therapy package needs once the heated seat is part of it.

How Many Dedicated Lines a Heated Seat Tub Needs

Ella's line counts follow the therapy package, not the model name. Every cord on the tub is labeled at the factory, and every labeled cord needs its own dedicated 20 amp, 120 volt GFCI protected circuit that shares nothing with any other appliance. The published counts are:

• One line: hydro only, air only, or hydro plus air.
• Two lines: hydro plus microbubble, hydro plus foot massage, and the heated seat variants.
• Three lines: the ShaK, the Big4One and the two seat tubs with the full package.

In other words, adding a heated seat puts the tub at two lines. Even the fullest single-seat stack on the Transfer60, TransferXXL and Ultimate sheet, with two hydro pumps, an air pump, the optional microbubble pump, the in-line water heater, the heater pads, the ozone generator and the LED light, runs on two dedicated GFCI protected 20 amp, 120 volt lines.

The ShaK is the exception to watch. It lists the heated seat and backrest as an option, and with all four therapies it needs three dedicated circuits, as explained in the ShaK electrical circuits guide.

The simplest check is on the tub itself. Count the labeled cords, or read the package sheet packed with the tub. On a two line tub the stickers read Line 1 20 Amp and Line 2 20 Amp. Each cord equals one dedicated circuit, and no two lines share a receptacle. Two labeled cords on one circuit trip the breaker as soon as the second pump starts.

Can the Line Be 15 Amp Instead of 20?

Plan for 20 amps. The published standard for every labeled line on an Ella walk-in tub is a dedicated 20 amp, 120 volt GFCI protected circuit. A 15 amp line can work on some lighter packages, but 20 is the published standard, and a heated seat package is a two line package rather than one of the lightest ones.

There is also a practical reason that shows up at the plug. The master control box video shows two boxes side by side. The first has a standard three prong 15 amp connector on its power cord. The second, which also controls hydro, air, LED and the heated seat, has an actual 20 amp plug with one vertical blade and one horizontal blade. A plug with one horizontal blade needs a 20 amp receptacle and will not fit a 15 amp type receptacle.

If an installer finds that one cord will not go into the outlet, the answer is to have a licensed electrician change the receptacle to match, never to adapt the plug or reach for a different outlet. Which Cord Plugs In Where on My Walk-In Tub? explains how to match each labeled cord to its outlet.

The amp draw of the heater pads themselves is not listed in the published material this page draws on, so it is not quoted here. Ella's spec sheets also carry a printed note that the amp value for each pump may change based on availability. That is one more reason to wire to the published 20 amp standard rather than sizing a circuit to a single component.

What to Give Your Electrician Before Rough-In

Ella does not send technicians, so a local licensed electrician does this work. These are the points to hand over:

1. The line count. Count the labeled cords or read the package sheet. A heated seat variant is two dedicated lines unless your package sheet says three.
2. The circuit type. Each line is a dedicated 20 amp, 120 volt GFCI protected circuit that serves the tub and nothing else.
3. Where the GFCI sits. It can be at the breaker or at the receptacle. One or the other is sufficient, and doubling up is not needed.
4. Outlet location. Place the outlets under the seat area, inside or directly behind the equipment compartment, so every cord reaches. Fix reach at the outlet, never with an extension cord.
5. The receptacle type. Where the master control box carries a 20 amp plug with one blade turned sideways, the receptacle must be a 20 amp receptacle.
6. Clearance. Keep other appliances at least 3 feet from the tub.
7. The diagram. Ask your Ella dealer or the team at (800) 480-6850 to email the electrical diagram for your model and package, so the count and outlet location are settled before the walls are closed.

Using the Heated Seat Once It Is Wired

Because the heated seat runs through the tub's own controls, it behaves like one of the tub's therapies rather than a separate appliance. The Heated Seat Option video on this page shows the routine:

• Push the button once and the heated seat activates.
• Turn it on 10 to 15 minutes before you enter the tub for maximum comfort.
• The seat turns off automatically after 20 minutes. Push the button again to turn it back on.

On packages with a digital controller, the heater has its own keypad, labeled Heat Keypad on the schematic.

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

Related Guides

• What the Full Push-Control Package Schematic Shows: Air + Hydro + Hydro Foot + Microbubble + Heated Seat and Back (Transfer60, TransferXXL, Ultimate)
• Heated Seat and Back Not Warming Up: Checking the Control Box LED and the Button Prongs
• How the optional heated seat and backrest works, and why it turns off after 20 minutes

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