What’s the Difference Between a Hot Tub and a Spa?

What’s the Difference Between a Hot Tub and a Spa?

If you’ve ever heard someone use the words hot tub and spa like they’re the same thing, you’re not alone. Most people mix them up, and in everyday conversation it’s totally fine. But if you’re shopping for one or trying to understand what you already own, the differences actually matter.

Hot Tubs: Portable, Self-Contained, and Easy to Install

A hot tub is the general term for a portable, stand-alone unit filled with heated water for soaking and relaxation. These are the ones most people picture in a backyard.

Hot tubs typically include:

  • Built-in jets and pumps

  • An acrylic shell

  • A control panel

  • A fully self-contained design

Because everything is built into the unit, you can place a hot tub almost anywhere you have a level base and the right power source. They’re also easier to maintain since they don’t rely on external plumbing.

In short, hot tubs are designed for convenience and flexibility.

Spas: Built-In and Often Connected to Pools

A spa can mean two things, and this is where confusion begins.

In a backyard or pool setting, a spa usually refers to a built-in structure made of concrete or gunite that may share plumbing or filtration systems with a swimming pool. These spas are permanent, custom-designed, and integrated into the surrounding space.

They’re great for homeowners building a custom pool layout or those wanting a seamless, high-end look. But since they’re tied into the pool system, maintenance can be a bit more involved.

The Other Meaning of “Spa”

Outside of backyard terminology, “spa” is also used in the wellness world to describe businesses that offer treatments, hydrotherapy, and relaxation services.

This doesn’t affect hot tub shopping, but it’s part of why the word is used so loosely.

So… Which One Do You Have?

A quick way to tell:

  • Portable unit you can move: hot tub

  • Built into the ground or connected to your pool: spa

A good rule of thumb: Every portable spa is a hot tub, but not every spa is a hot tub.

Choosing Between a Hot Tub and a Spa

If you’re deciding what to buy or install, think about what matters most to you:

  • Hot tubs offer easier installation, lower maintenance, and more flexibility.

  • Spas offer a custom, built-in design that blends into your pool or patio setup.

Both options deliver warm water relaxation and hydrotherapy benefits. It ultimately comes down to space, budget, and the experience you want in your backyard.

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