Barrel Hot Tub or Round Cedar Tub: What Is the Difference?

A barrel hot tub is a round tub built the way a barrel is: vertical staves of wood, usually cedar, drawn into a circle by steel bands around the outside. The name describes the construction, not just the shape. A round cedar tub can look almost identical from across the garden and be built entirely differently, with the cedar wrapped around a structure of another material that holds the water. Both are round. That is where the similarity ends.

Here is how the two formats compare on the things that matter once the tub is in use.

What makes a barrel hot tub a barrel

Cooperage. The staves are cut with angled edges so they meet in a circle, set into a groove in a wooden floor, and pulled tight by bands. Nothing seals the joints except the wood itself, which swells with water until each stave presses against the next. It is the oldest way to make a watertight wooden vessel and it works, on the same terms it always has: the wood must stay wet.

Some barrel tubs add a plastic or fiberglass lining inside the staves so the wood no longer has to seal. That changes the ownership picture considerably, so a barrel tub is worth asking about: is the wood the vessel, or is there something inside it?

What a round cedar tub on an aluminum structure is

The round shape comes from the structure rather than from staves. An AlumiTub is a riveted marine-grade aluminum structure, insulated on every side, with Canadian Western Red Cedar boards banded around the outside as cladding and cedar seats and lid inside. The cedar is doing what cedar does well, insulating and looking right, and the aluminum is doing what wood cannot: holding water whether the tub is full or empty, taking a lake or ocean fill, and rolling into position at 200 to 300 lbs. Why an aluminum structure sets out the reasoning.

Where the formats differ

	Barrel hot tub, all-wood	Round cedar tub, aluminum structure
What holds the water	Swollen cedar staves	Riveted marine-grade aluminum
Can it be left empty	No	Yes
Insulation	The wood alone	360 degrees, 3.5 inches beneath, floating layer on the surface
Interior surface	Wood grain, brushed clean	Smooth aluminum, wiped clean
Water sources	Fresh water	Fresh, well, rain, lake, river or ocean
Heating	Wood, sometimes electric	Wood, electric or both, changeable later
Arrives as	Often a kit	Pre-assembled, sets up in about an hour
Moving it later	Disassemble	Roll it
Structural warranty	Varies, often short	25 years

What they share

The round form, and it matters more than it gets credit for. Everyone faces inward, the conversation goes across the middle, and the view runs all the way around. A rectangular tub is a shared bath by comparison. Round also rolls: a barrel tub on its side moves the same way a cedar-clad aluminum tub does, if it can be emptied without consequence, which brings the two formats back to their one real difference.

Depth is worth checking on either. A barrel tub is often shallower than it looks, and an upright soak needs the water over the shoulders. Every AlumiTub is 38 inches deep as standard, with 21.5 inches of water over the seat at the recommended fill, and 44 or 48 inch builds available.

Electric barrel hot tubs

Any round cedar tub can carry electric heating, and some all-wood barrels do. On an Electric AlumiTub the heating and filtration system is detachable, housed in cedar steps beside the tub, and every part is reachable; on a Hybrid the same system sits alongside a submerged wood firebox. The heating options guide compares the three.

For the things that catch buyers out with either format, five things most buyers never know about cedar hot tubs is the short version.

Common questions

What is a barrel hot tub?

A round tub built like a barrel: vertical cedar staves set into a wooden floor and drawn tight by steel bands, sealed only by the wood swelling with water. Some add a plastic or fiberglass lining inside the staves, which changes how the tub behaves, so it is worth asking whether the wood is the vessel.

Is a barrel hot tub the same as a cedar hot tub?

A barrel tub is one kind of cedar hot tub. Other round cedar tubs wrap the cedar around a structure of another material, such as marine-grade aluminum, that holds the water on its own. Both are round and cedar on the outside; they differ in what is inside.

Do barrel hot tubs leak?

All-wood barrel tubs seal only while the staves are swollen, so they leak after being left empty and can weep as the wood moves over the years. A round cedar tub on an aluminum structure holds water without depending on the wood and can be drained and left empty.

Can you get an electric barrel hot tub?

Yes. Some all-wood barrels take an electric heater, and a cedar-clad aluminum tub is available as an Electric, with detachable heating and filtration in cedar steps beside the tub, or as a Hybrid with a wood firebox as well.