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Will I Get Cold While the Tub Fills or Drains? The Most Common Question, Answered on Video

Updated September 2026

Will I get cold while the tub fills or drains? No, not in the way people fear. It is the question Ella's Bubbles hears most often about walk-in tubs: whether you will sit shivering while the tub fills and again while it drains. The short answer from Ella's own video is that the tub is designed around exactly that worry: fast-fill faucets shorten the wait, the glossy acrylic shell holds heat, the in-line water heater keeps the water warm during the hydro massage, and the optional heated seat and backrest warms the seat before you ever sit down. At the end of the bath, Ella's dual 2 inch gravity drains empty an average tub in approximately 80 seconds under ideal conditions.

The video opens with the question itself, "Will I get cold while the tub fills and when the tub drains?", and answers it in four parts. First, the five-piece and two-piece fast-fill faucets fill the tub quickly so you are not waiting long to enjoy the soak. Second, the interior of the glossy acrylic tub acts like an insulator, and the inside walls help maintain a comfortable temperature. Third, the tub water is kept warm by an in-line water heater. Fourth, you can order the heated seat: push the button, wait a few minutes for the seat to heat up, slide in and then fill the tub; after 20 minutes the seat heater turns itself off, and a simple push of the button turns it back on. The video closes with the drain: dual oversized 2 inch T-type drains empty an average size tub in approximately 80 seconds under ideal conditions, so you are on your way warm and relaxed.

The Four Answers, One at a Time

  • Fast-fill faucets. Ella's deck-mount faucets are built to maximize water flow. Ella publishes a fill range of 7 to 15 minutes depending on the size of the tub and the water supply configuration in your home, and notes that it takes about 10 minutes to reach a level where the hydro jets can be used and about 6 minutes more to reach the overflow. The details are in our fast-fill faucet expectations article, and the size of your water heater matters just as much; see what size water heater you need.
  • Insulating acrylic. Ella describes the glossy acrylic interior as acting like an insulator: once the water is in, the inside walls help hold the temperature rather than pull it away.
  • In-line water heater during hydro massage. Tubs with the hydro massage option include an in-line heater. It maintains the temperature you set at the faucet, and it runs only while the hydro pump runs. It does not heat cold water, so fill at the temperature you want and let the heater hold it there while you enjoy the massage. Our article on what the in-line heater does and does not do has the details.
  • Heated seat before you sit. The optional heated seat and backrest is an electric surface heater with its own keypad, completely separate from the water heater. It warms the seat while the tub is still empty, which is the moment people worry about most.
Heated seat and backrest inside an Ella walk-in tub with the chromatherapy light glowing
The heated seat and backrest warms the surfaces you sit against while the tub is still empty.

The Heated Seat Routine

This short clip shows the routine in order. Push the heated seat button once and the seat activates. Turn it on 10 to 15 minutes before you enter the tub for maximum comfort. The heated seat turns off automatically after 20 minutes, and if you would like it back on, just push the button again. Put together with the first video, the sequence is: press once, wait, sit, close the door and fill. The 20 minute auto-off is a timer, not a fault, and restarting it is always one press.

Setting the Temperature as You Fill

Hand testing warm water flowing from the chrome fast-fill faucet on an Ella Elite walk-in tub deck
Test the water at the faucet as the tub fills; the in-line heater holds whatever temperature you choose.

Because the heater maintains rather than raises the temperature, the fill is your one chance to set it. Adjust the faucet until the stream feels right, keep the water warm rather than hot (Ella's manuals warn against exceeding 100.4 degrees Fahrenheit), and on tubs with the thermostatic faucet package the thermostatic control valve holds that ceiling for you. If the water runs cool partway through a fill, the cause is almost always the household water heater running short, not the tub.

Draining

Ella's drains are gravity driven, with two oversized 2 inch drains rather than one. Under ideal house-drain conditions an average tub empties in about 80 seconds. Both drain handles must be opened completely, and the door stays closed until the tub is fully drained. If your tub drains noticeably slower than that, the house drain line is usually the reason, and our article on slow draining walks through the checks; dual drain technology explains why two gravity drains empty the tub so quickly.

Common Questions

Will I get cold while the tub fills or drains?
The fill is measured in minutes with the fast-fill faucet, the drain is measured in seconds, and the heated seat covers the wait at both ends. Ella recommends the heated seat for anyone concerned about the wait.
How long does the heated seat stay on, and can I restart it?
It runs for 20 minutes and then turns itself off. Press the button once more and it runs again. Press it 10 to 15 minutes before you get in for the warmest start.
How fast does an Ella tub drain?
Approximately 80 seconds for an average tub under ideal conditions, through dual 2 inch gravity drains. Larger tubs and slower house drains take longer.
Does the acrylic hold heat?
Yes. Ella describes the glossy acrylic interior as acting like an insulator, and the inside walls help maintain the water temperature.
Does the in-line heater keep the water warm?
It maintains the temperature while the hydro pump is running. It will not make a cool bath warmer, so set your comfortable temperature at the faucet as you fill.
How long does the water stay warm?
In a filled large tub the water stays comfortably warm for roughly 20 minutes or more depending on the room, and the in-line heater holds the temperature while hydro runs.
Can I keep the heated seat on while draining?
Yes. Many owners also keep a robe within reach or rinse with warm water from the hand shower while the tub empties.
Can I fill the tub first and step in afterward?
Ella does not recommend entering a tub that already has water in it; it is considered unsafe. Sit, close the door, then fill.
Can the heated seat be added to a tub I already own?
The heated seat is built into the tub at order time, so it is not a field retrofit on an installed tub. It can be added to a standard order; clearance units are sold as configured. Ask the team about your situation.

For anything model-specific, open a ticket at ellasbubbles.com/support or call (800) 480-6850 and the team will be glad to help.

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