Cedar Hot Tubs: The Simple Upgrade That Changes Everything

A cedar hot tub is an outdoor soaking tub built from Canadian Western Red Cedar, valued for its warmth, rot resistance and natural insulation. The pros are atmosphere, durability and a renewable material. The drawbacks come almost entirely from one construction choice: whether the cedar itself is doing the watertight work.

There is a reason cedar hot tubs have stayed loved for generations. They feel at home outdoors. They smell like the forest after rain. And they offer an invitation to slow down, stay a little longer, and gather with good company.

Cedar also comes with a few realities worth understanding upfront. Not because cedar is high maintenance, but because a cedar tub can be built in very different ways.

What is a cedar hot tub?

A cedar hot tub is any outdoor soaking tub built from cedar. They can be heated by wood or electricity, run with filtration or without, and pared back for off-grid use or outfitted with everything. What they share is the material: Canadian Western Red Cedar, known for its beauty, its resistance to rot and decay, and its thermal qualities.

Sizes typically run from two people to eight. Shapes range from the Japanese oval soaking tub to round, square and bath-shaped. Round suits a seated soak and conversation; rectangular suits a reclined, bath-like one. What size cedar hot tub do you actually need works through the decision.

The real pros of cedar

Cedar feels warm, inside and out

Cedar is naturally insulating, which is one reason it feels so comfortable in cold air. Its low density is the reason: the cell cavities fill with air and trap heat as the wood warms, making it a better insulator than brick, concrete or steel.

It is naturally durable

Western Red Cedar handles outdoor exposure well. It is rot-resistant, performs reliably in damp environments, and its long straight grain resists twisting, warping and shrinking. Used thoughtfully, it is a very long-lived material.

It is a responsible material

Cedar is fully biodegradable and has one of the longest lifespans of any North American softwood. Set against acrylic and fiberglass, which cannot be recycled at end of life, it is a materially different proposition. More in how sustainable a hot tub really is.

The experience is the point

Acrylic tubs do convenience brilliantly. Cedar does atmosphere, aesthetics and longevity. Cedar tubs become part of a place. They suit cabins, courtyards, decks and gardens because they look like they belong there, and they do not need lights, screens or noise to feel special.

Cedar ages gracefully

A natural patina is part of cedar ownership. Over time it weathers and softens, eventually silvering. Many people love that. For those who prefer the warm tone of new cedar, it can be sanded back, sealed or toned, provided the product used is copper-free.

The drawbacks of traditional cedar tubs

Most of the issues people associate with cedar hot tubs are not cedar problems. They are construction problems. The question that matters is whether the wood is doing the watertight work.

Leaks when a wood-only tub dries out

In a traditional cedar tub, the timber is the seal. Wood swells when wet and shrinks when dry, so if a tub sits empty or is used only occasionally, gaps can open. Refilled, it needs time to swell and tighten again. Manageable if the tub is used often and kept full. Less appealing for a holiday property, or for anyone wanting low-fuss ownership.

Hygiene takes more effort

A timber interior has seams, joins and crevices. Those take more effort to clean well and are less forgiving if water care slips.

Freeze and thaw adds stress

In cold climates, repeated freezing and thawing contributes to movement over time. Wood-only tubs are more sensitive here, because the structure depends on timber stability to stay watertight.

Water chemistry is less forgiving

When wood is both the interior surface and the seal, water balance matters more. Regular treatment and more frequent changes are a heavier requirement than when the wood is not forming the seal.

The build choice that changes the experience

Cedar hot tubs are not all built the same. In practice there are two approaches:

• Cedar as the seal. Cedar forms the watertight structure, and everything depends on how the wood moves over time.
• Cedar as the cladding. Cedar provides the warmth, insulation and aesthetic, while a separate watertight foundation does the sealing.

The second approach is where aluminum-lined construction came from. In practice it changes five things:

1. It is light enough to roll or lift into place: 200 lbs empty on the Small, 220 on the Standard, 300 on the Large. No crane and no special equipment.
2. It allows 360 degrees of insulation: the sides, the base and the water surface.
3. It is easier to keep hygienic. A smooth, non-porous surface gives bacteria nowhere to establish, and there are no joints to clean between.
4. It arrives pre-assembled, where a cedar-only tub is built on site. Setup takes about an hour.
5. It holds water without depending on the wood swelling to seal, so it can be drained, moved and left empty without consequence.

Cedar as the seal and cedar as the cladding are two of four common approaches. Every hot tub material compared sets them against acrylic and rotomolded plastic, with the trade-offs of each stated plainly, including ours.

How an aluminum foundation changes cedar ownership

AlumiTubs pairs a marine-grade aluminum interior with Canadian Western Red Cedar outside, using a riveted construction method borrowed from aircraft and Airstream manufacturing. The structure carries a 25 year structural warranty.

Watertight without relying on wood movement

The tub does not need cedar to swell in order to seal. That means predictable performance in real use, particularly at a property used intermittently or in a hard climate. Leo Downey has run one at a Rocky Mountain guest ranch for five years, and leaving it empty through the winter is the part he singles out.

Cleaning is simpler

A smooth interior is easier to clean thoroughly. A soft cloth and a mild plant-based cleanser is the whole job, never abrasive and never vinegar. Pressure washing is not used on aluminum, because the surface protects itself with a thin oxide layer.

Water care, and what aluminum asks in return

Water care works differently from an acrylic spa, and mostly in your favor. With no jets, no internal plumbing and no filter chamber, there is nowhere for bacteria to establish that a drain and rinse does not reach, so the water needs far less treatment to stay safe. Set against a timber interior, where the grain itself holds what you are trying to remove, a smooth non-porous surface is the easier one to keep clean.

What the aluminum does ask is that the treatments you use are compatible: bromine rather than chlorine, no salt systems or copper and silver based products, alkalinity at 80 to 120 ppm adjusted first, pH at 7.4 to 7.8, calcium hardness at 150 to 250 ppm, and bromine at 2 to 3 ppm and never above 3. Those are specific numbers rather than general advice, and Good Clean Living Water Care is built around them so nothing needs checking against a label. The reasoning is in aluminum hot tub water chemistry and the beginner's guide to hot tub chemical balance. Whether it matters over decades is answered in do aluminum hot tubs corrode.

Reliability in hard winters

360 degrees of insulation, and on the wood side AlumiTubs have been tested heating in ambient conditions as cold as minus forty-four degrees Celsius. Cold weather testing covers what that means through a season.

Ocean water, by design

The marine-grade structure means an AlumiTub can be filled directly from the ocean. Marine practice means managing exposure rather than ignoring it: ocean fills are changed every five to seven days rather than left standing, and the tub is rinsed between fills.

Cedar, without a complicated finishing story

The cedar does not require treatment. It patinas naturally, and sanding brings it back closer to its original tone. Annual oiling is not necessary.

So, is cedar the right choice?

Cedar suits people who want the outdoors to feel closer, who care about renewable and recyclable materials over acrylic destined for landfill, and who appreciate a material that grows more beautiful with time.

A traditional cedar-only tub can be a good fit when the tub is used often and kept filled, when a hands-on relationship with the timber appeals, and when cedar doing the watertight job is an acceptable trade for more maintenance and a shorter life.

An aluminum-lined cedar tub is often the better fit when you want the look and feel of cedar without the classic drawbacks, when a calm ownership experience across decades matters, when the property sees demanding weather, or when the tub may need to be moved. What to expect in your first year sets the two side by side, season by season.

The takeaway

Cedar deserves its reputation. The atmosphere is real and the material is genuinely well suited to outdoor living. What changes everything is construction. When cedar is free to be cedar, and a watertight aluminum foundation handles the structural work, the best parts of a timber tub remain without the issues that cause owners to lose confidence over time.

When comparing options, look past the label and ask what actually keeps the water in.

Explore the range

The Wood Fired, the Electric and the Hybrid share the same aluminum foundation and cedar finish, with different heating to suit different properties.

The Wood Fired needs no electricity at all. The Electric holds a set temperature anywhere from 50 to 104°F with timer schedules for heating and filtration, a single 30 gpm jet that keeps it close to silent, a 50 micron filter holding a fill for three to four months, and the whole system concealed in cedar steps where every part stays reachable. The Hybrid carries both, run alone or together. The complete guide to heating options compares all three. Questions are welcome at hi@alumitubs.com.