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

No. The heated seat and backrest does not take a dedicated circuit of its own, because it is powered through the tub's master control box rather than by a separate cord. What changes is the total count: Ella's published line counts place every heated seat variant at two dedicated 20 amp, 120 volt GFCI protected circuits, so an Air + Hydro tub that would run on one line needs two once the heated seat is added, and 20 amps, not 15, is the published standard for every line on a tub with pumps. How Many GFCI Circuits Does My Walk-In Tub Need? gives the rule for the whole line, and this page covers what the heated seat changes and the two cases where a 15 amp line is correct.

Where the Heated Seat Gets Its Power

The heated seat and backrest is a set of heater pads behind the acrylic of the seat and back, switched from a heat keypad on the deck. It has no power cord of its own. In the master control box video, the presenter holds up two boxes and points out the connector where the heater pads plug in, beside the ports for the air pump and the water pump, and then the single power inlet that feeds the whole box. The boxes are called master control boxes, the video explains, because they control the massage systems and include the heated seat. A green light on the box shows when power is reaching it.

The published schematics draw it the same way. The fullest single-seat package sheet, published for the Transfer60, TransferXXL and Ultimate, numbers ten components, among them the Master Control Box, the Surface Heater Pads and the Surface Key Pad labeled Heat Keypad, and it states that the entire stack of two hydro pumps, an air pump, the optional microbubble pump, the in-line water heater, the ozone generator, the LED light and the heater pads runs on two dedicated GFCI protected 20 amp, 120 volt lines. The digital controller version of that schematic and the push-control version print the same electrical requirement. The heated seat shares a line with the massage equipment on the master control box and never calls for a third line of its own.

How the Heated Seat Changes the Line Count

Every labeled cord on an Ella walk-in tub needs its own dedicated 20 amp, 120 volt GFCI protected circuit that shares nothing with any other appliance, and the count follows the therapy package rather than the model name. The published counts are below.

For an Air + Hydro tub the practical difference is one extra circuit. Without the heated seat the tub runs from a single dedicated line. With it, the published count is two, and each is a separate 20 amp, 120 volt GFCI protected run from the panel. The cords are labeled at the factory, on a two-line tub they read Line 1 20 Amp and Line 2 20 Amp, and no two labeled cords may share one receptacle, because two pumps on one circuit trip the breaker as soon as the second pump starts.

Why the Answer Is 20 Amps, Not 15

Ella's published electrical requirement for every line on a tub with pumps is a dedicated 20 amp, 120 volt GFCI protected circuit. The live circuit guide is candid that a 15 amp line "can work on some lighter packages, but 20 is the published standard," and an Air + Hydro tub with a heated seat is not a light package. It has a hydro pump, an air pump and an in-line heater on those two lines before the heater pads are counted. The heated seat itself draws about 4 amps, which is why it does not need a line to itself, but that draw is added on top of the pumps rather than replacing them.

There are only two published cases where 15 amps is correct: the Ella Flow, and a soaking tub whose only electrical item is the heated seat and backrest. If your tub has any pump at all, plan on 20 amp lines.

Plug shape can mislead here. In the master control box video, the first box carries a standard three prong 15 amp NEMA connector, while the second carries a 20 amp plug with one blade turned horizontal, the connector you receive when you ask for a 20 amp receptacle at a hardware store. The plug tells your electrician which receptacle to install; it does not change the circuit requirement. If a big plug will not fit the GFCI, the receptacle is a 15 amp type and the receptacle is what gets changed, never the plug. Which Cord Plugs In Where on My Walk-In Tub? walks through matching each labeled cord to its outlet.

What to Settle Before the Walls Close

1. Check that the heated seat and backrest appears on your order paperwork. The line count and the outlet locations follow the options actually built into the tub.
2. Have your electrician work from the spec sheet for your exact model and option combination, and ask your Ella dealer or the team at (800) 480-6850 to email the electrical diagram so the count is settled before rough-in.
3. Run each line as its own dedicated 20 amp, 120 volt GFCI protected circuit. The GFCI can sit at the breaker or at the receptacle; one or the other is sufficient.
4. Place the outlets under the seat area, inside or directly behind the equipment compartment, so the pump and heater cords reach without extension cords.
5. Keep other appliances at least 3 feet from the tub.
6. Match each receptacle to its plug, with a 20 amp receptacle wherever a cord carries the horizontal-blade 20 amp plug.

Using the Heated Seat Once It Is Wired

Once the tub is powered, the heated seat is a one-button feature. Press the button once and the seat and backrest begin to warm; the heated seat video recommends turning it on 10 to 15 minutes before you enter the tub for maximum comfort. It turns itself off automatically after 20 minutes, and pressing the button again turns it back on. If several functions act up after the cords are connected, start by confirming that every labeled cord is on its own dedicated outlet and that the green light on the master control box is lit.

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

Related Guides

• Electrical requirements by model: dedicated GFCI circuits for your walk-in tub
• What the Soaking + Heated Seat & Back Schematic Shows: Three Components, No Pumps, and the Only 15 Amp Callout

Common Questions