How to Choose a Hot Tub: Seven Decisions, in Order

To choose a hot tub, work through seven decisions in order: who will use it and how often, what size, how it heats, where it goes, what it is made of, how much water care you want, and how long it needs to last. Settling them in that sequence keeps the early choices from being made by the brochure, and the later ones from being made by accident.

Most guides to choosing a hot tub start with features. Features are the last thing worth comparing. Below is the order we walk buyers through, written to be useful whichever tub you end up with.

1. Who will use it, and how often

Start with the honest picture. A tub used every evening by two people is a different purchase from one used on weekends at a cabin, or one shared by guests at a rental. Frequency decides the heating system. The property decides whether that system is possible.

Write down three things before looking at a single model: how many people will usually soak together, how many evenings a week, and whether the tub will sit full and ready or be filled when you arrive.

2. What size hot tub

Choose for the number of people who will regularly soak, not the most you might ever host. On a round tub, diameter decides seating: a 5 ft (1.5 m) tub seats two, a 6 ft (1.8 m) seats five, a 7 ft (2.1 m) seats eight. A round form also means everyone faces each other and the view runs all the way around.

Depth matters less than many buyers expect. A 38 inch (97 cm) tub puts most people under to the shoulders, with 21.5 inches of water over the standard bench. Deeper 44 and 48 inch builds suit taller bathers or a raised bench. Hot tub dimensions and sizes has the full table of diameters, capacities and weights, and the small space guide covers courtyards and decks.

3. How it heats

This is the decision that shapes daily life with a hot tub more than any other.

	Wood fired	Electric	Hybrid
Best for	Planned soaks, cabins, off-grid	Frequent, spontaneous soaks	Both, through every season
Power needed	None	Dedicated 240V, 30 amp circuit	Dedicated 240V, 30 amp circuit
Heat from cold	About 2, 3 or 5 hours by size	Up to 14 hours, then held	Fire times, faster with both running
Between soaks	Loses 2 to 3°F overnight with the lid on	Holds a set temperature, 50 to 104°F	Either

Wood fired is a ritual: you light the fire, and the soak arrives a couple of hours later. Electric is readiness: the water is waiting whenever you are. A Hybrid lets you heat with wood and hold on electric, or run both to heat faster. The heating options guide goes deeper, and wood fired vs electric compares them side by side.

4. Where it goes

A good site is flat, level and rated for the filled weight, has room above any chimney, a route in, somewhere for drained water to go and, for an electric tub, a circuit run before the tub arrives. Filled weights run from about 3,200 lbs (1,450 kg) on a 5 ft tub to 7,000 lbs (3,175 kg) on a 7 ft.

Access is where many buyers get caught out. A conventional spa often needs a crane. A lighter, pre-assembled tub that rolls on its side through a 38 inch (97 cm) gap opens up rooftops, island cabins and back gardens with no side access. Before you buy covers permits, bylaws and site questions, and preparing for delivery covers the base.

5. What it is made of

The material decides how the tub ages, how the water behaves and what can be repaired. Acrylic spas are molded and familiar. Traditional all-wood tubs rely on the timber itself to stay watertight, so they need to stay full. Metal tubs, in aluminum or stainless steel, hold the water in the metal and let the wood do what it does best outside: insulate and look beautiful.

Hot tub materials compared sets the options out fairly, and aluminum vs stainless steel answers the question buyers ask most about metal tubs.

6. How much water care you want

Every hot tub needs water care. What varies is how much. Banks of jets and long runs of internal plumbing give water places to sit, which is why many spas need more sanitizer, more often. A tub with few or none of those needs far less. Ask how long a fill typically lasts, what sanitizer the tub is designed for, and whether the interior can be reached by hand when it is drained.

On an AlumiTub, a Wood Fired fill lasts days to a couple of weeks on a fresh fill routine, and three to four months once filtration is fitted, the same as an Electric or Hybrid. The Water Care Academy explains the rest in plain language, starting with how to balance hot tub water.

7. How long it needs to last

A hot tub rarely fails all at once. It fails when one part does and that part cannot be reached. So the useful question is not how long the warranty runs, but what happens when a pump, heater or control board fails in year twelve. If every component can be reached, replaced and upgraded, the tub keeps going. If it is sealed in foam behind a cabinet, it often does not.

That thinking sits behind the Evermore Standard: a tub that can be worked on, that changes with you, and whose structure carries a 25 year structural warranty. Whatever you buy, ask the same questions of it.

Putting it together

Once the seven decisions are made, the shortlist usually writes itself. If you would like to see how the three AlumiTub systems line up against each other, compare the cedar hot tubs, or browse the Knowledge Centre for the next question.

Common questions

What is the most important thing when choosing a hot tub?

How you will actually use it. How often you soak, how many people join you and whether the property has power decide the size and the heating system. Materials and water care decide what ownership feels like over the years. Settle use first and most of the other choices follow.

What size hot tub do I need?

Choose by the number of people who will regularly soak together, not the most you might ever host. On a round tub, diameter decides seating: a 5 ft (1.5 m) tub seats two, a 6 ft (1.8 m) tub seats five and a 7 ft (2.1 m) tub seats eight. Depth matters less than most buyers expect; 38 inches puts most people under to the shoulders.

Is a wood fired or electric hot tub better?

Neither is better in general. Wood fired suits planned soaks, off-grid properties and people who enjoy lighting the fire, heating in about two to five hours by size. Electric suits frequent, spontaneous soaks where there is reliable power, holding a set temperature between 50 and 104°F. A Hybrid does both.

How long does a hot tub last?

It depends mostly on construction and on whether the parts that wear can be reached and replaced. A tub whose heater, pump and controls are accessible can be serviced for decades. One with components sealed inside foam often reaches the end of its life when a part fails. Ask any maker what happens when a component fails in year twelve.

Do I need a permit for a hot tub?

Usually not for the tub itself. A freestanding tub with no plumbing is generally treated as a movable object. An electric hot tub needs a dedicated 240V circuit, which needs a permit and a certified electrician. Decks, roofs and fences around the tub follow the usual rules, and some areas restrict wood burning, so check locally.