Hot Tub vs Jacuzzi: What Is the Difference?

There is no difference in the thing itself. Jacuzzi is a brand name that became the everyday word for any jetted hot tub, the way Kleenex did for tissues and Hoover did for vacuum cleaners. A hot tub is any tub of heated water people sit in. A Jacuzzi is a hot tub made by the Jacuzzi company, and by extension any tub with hydrotherapy jets. Every Jacuzzi is a hot tub. Not every hot tub is a Jacuzzi, and quite a few are not jetted at all.

That last part is where the question gets useful, because the real choice is not between two words. It is between a jetted spa and a soaking tub.

Where the word came from

The Jacuzzi brothers were Italian immigrants making aircraft propellers and agricultural pumps in California. In the 1940s one of them built a submersible pump for a family member's home bath to deliver hydrotherapy, and in 1968 a third-generation Jacuzzi, Roy, put the jets into a self-contained tub with heating and filtration. That was the first modern spa, and the name stuck to the category.

Today Jacuzzi still makes hot tubs, and so do dozens of other companies. In everyday speech in North America, jacuzzi, hot tub and spa are used interchangeably, and hot tub is the one that covers everything.

What a jetted spa is

The tub most people picture when they say jacuzzi: a molded acrylic shell with contoured seats, twenty to sixty jets fed by one or more pumps, an electric heater, filtration, lighting and a control panel, all housed in a cabinet packed with foam and plumbing. Jets push water and sometimes air through nozzles for massage. The whole unit is heated continuously and drained a few times a year.

What it is good at: hydrotherapy, a temperature that is always ready, and a lot of features in one box. What it asks: a dedicated electrical circuit, usually a crane on delivery day, a treatment routine to keep the plumbing clean, and a service technician when a pump or heater fails inside the cabinet.

What a soaking tub is

A hot tub with no jets, or with a single circulation outlet rather than a bank of them. The point is immersion in hot water, in the open air, without noise. Historically that is what a hot tub was: the redwood tubs of 1960s California were wood burning soaking tubs, and the Japanese bath they borrowed from is a soaking tub too.

The modern versions are cedar tubs heated by wood, electricity or both. An AlumiTub is one: a marine-grade aluminum structure clad in Canadian Western Red Cedar, 38 inches deep so you sit upright with your shoulders under, and round so everyone faces each other. The Wood Fired has no plumbing at all. The Electric has a single 30 gpm jet and a filter circuit housed in cedar steps beside the tub, close to silent, with every part reachable.

Jetted spa or soaking tub, side by side

	Jetted spa	Soaking tub
The experience	Massage, motion, features	Still hot water, quiet, the view
Sound	Pumps and jets	Almost none, or a crackling fire
Depth	Reclined, often shallow over the seat	Upright, shoulders under
Power	Continuous electricity	None on a wood fired tub; scheduled on an electric one
Installation	Electrician and usually a crane	Rolls into place by hand
Water care	Higher, because of plumbing you cannot reach	Lower, because every surface can be cleaned
Servicing	Components sealed in the cabinet	Little to service, or all of it in reach
Best for	Therapy, always-on convenience	Cabins, gardens with a view, anyone who wants quiet

How to choose

If what you want is hydrotherapy, and you have the power and the access for it, a jetted spa is the right tool and a Jacuzzi is a well-known one. If what you want is to sit outside in hot water with the people you like, at a cabin or under the stars, without a motor running, you want a soaking tub, and the wood fired kind will do it with no electricity at all.

A good test: picture the tub with nobody in it. If the appeal is the machine, choose the spa. If the appeal is the place, choose the tub. The wood fired against electric spa comparison goes deeper, and the heating options guide covers the three ways a soaking tub can be heated.

Common questions

Is a Jacuzzi the same as a hot tub?

A Jacuzzi is a hot tub. Jacuzzi is a brand that popularized the jetted spa in 1968, and the name became the everyday word for any jetted tub. Hot tub is the general term and covers jetted spas and jetless soaking tubs alike.

What is the difference between a hot tub and a spa?

In everyday use, none. Spa tends to be used by the industry for a self-contained acrylic unit with jets, pumps and a heater. Hot tub covers that and also wooden or cedar soaking tubs with no jets or a single gentle one.

Do hot tubs need jets?

No. Jets deliver massage, and plenty of people want that, but the original hot tubs were jetless soaking tubs, and cedar tubs are still made that way: a wood fired tub has no jets at all, and an electric cedar tub typically has one gentle jet rather than a bank of them. Without banks of jets there is no bank of pumps to hear, no plumbing runs to keep clean, and no electricity needed on a wood fired tub.

Which is better, a jetted spa or a soaking tub?

Neither in general. A jetted spa suits hydrotherapy and always-on convenience where power and access allow. A soaking tub suits quiet immersion, cabins and gardens with a view, and it can run with no electricity at all. Picture the tub empty: if the appeal is the machine, choose the spa; if it is the place, choose the tub.