In short
Nordic baths are attracting more and more garden owners looking for a simple relaxation space, without construction or sophisticated equipment.
Unlike an inflatable spa or a classic jacuzzi, this wooden pool is heated by fire and requires neither a pump nor complex filtration.
This short practical article details how it works, the criteria for choosing it well, its real benefits and the maintenance required throughout the seasons.
What is a Nordic bath and how does it work?
A Nordic bath is like a large wooden tub where you immerse yourself up to your shoulders in water heated between 37 and 40°C.
Some manufacturers now offer a whole range of Nordic wooden baths, with different sizes and wood species depending on the needs of the household.
There are no jets, no digital control panel, and no electric pump running continuously here, since the heat comes from a wood stove, either immersed directly in the water or installed outside the tank and connected by two pipes.
The internal stove heats the water without heat loss and retains the charm of a traditional bath, but it takes up space in the tub. The external stove frees up the interior of the tub, at the cost of visible piping all around.
Depending on the volume of water and the type of stove, it takes between 2 and 5 hours to heat up.
In addition, a compact tank for two people heats up significantly faster than a family-sized 1800-litre model, and an internal stove, in direct contact with the water, generally heats up faster than an external stove connected by pipes.
How to choose your Nordic bath?
The size of the tank depends first on the available space in the garden or on the terrace, but above all on the number of people who will use it at the same time.
A model for 2 to 4 seats is sufficient for a couple, while a large family will opt for 6 to 8 seats.
The wood used must be rot-resistant, therefore naturally resistant to moisture and insects. Red cedar and Siberian larch are the most commonly used species for this reason.
There are also tanks made of thermowood or recyclable plastic, which are easier to maintain but less traditional in appearance.
The heating method greatly changes daily life. The wood-burning stove remains the most economical solution to use and the closest to the original Scandinavian spirit.
Electric heating allows for a more regular and programmable temperature rise, at the cost of a higher electricity bill and an installation connected to the grid.
- No pump or complex electrical circuit to maintain
- Reduced operating costs with wood heating
- Installation possible without major excavation work
- It takes several hours to warm up before you can enjoy it
- A regular supply of dry wood must be planned
- Maintenance of the wood in the vat should not be neglected
A full heating cycle consumes on average between 15 and 20 kg of dry wood for a 1500 litre tank, heated from 10 to 38°C.
With damp wood, this quantity increases by 30 to 50% for an equivalent thermal result, hence the advantage of storing your wood under cover for several months before using it.
We have summarized this in this small summary table.
| Heating method | Warm-up time | Tank dimensions | Interview |
|---|---|---|---|
| Internal wood-burning stove | 2 to 4 hours | Reduced (stove in water) | Regular chimney sweeping |
| Outdoor wood stove | 3 to 5 hours | Free | Piping to monitor |
| Electrical resistance | 3 to 6 a.m | Free | Electrical connection |
Simulate the heating time of your Nordic bath
Estimate the heating time of your Nordic bath
Tank volume
Type of heating
Season
What are the benefits of a Nordic bath?
Water heated between 37 and 40°C provides deep muscle relaxation after a physical day or sporting effort.
The heat acts on the tension in the back and shoulders, much like a prolonged hot bath but with a much larger volume of water and immersion.
Some users suffering from mild joint pain find temporary relief, but this does not replace medical advice in the case of chronic conditions.
The heat also promotes sleep when the session takes place in the evening, by gradually lowering the level of nervous tension.
Nordic bathing does not replace medical treatment, but fits well as a weekly relaxation ritual, just like a sports session or an evening without screens.
From an ecological point of view, wood energy remains today the first renewable energy consumed in France, far ahead of other sources, as recalled by ADEME in " Wood, a renewable energy" published on its website.
A Nordic bath heated with wood fits into this logic, without continuous electricity consumption linked to a pump or filtration.
Plan the session for the end of the day, once or twice a week: relaxation sets in better when the bath becomes a regular ritual rather than an occasional use.
Maintenance and lifespan of the Nordic bath
The tank should be cleaned regularly with clean water, without harsh products to avoid damaging the wood. The wood should also be treated once or twice a year with a suitable oil or saturator to maintain its natural water resistance.
Without a filter or maintenance product, the water needs to be changed within two days of the first use, and with a filtration system, it can remain clean for several weeks, or even a few months depending on usage.
A 100% wood Nordic bath should never remain empty for long: the wood dries out, shrinks and can crack, which creates leaks when refilled.
An insulating cover limits heat loss between sessions and protects the water from leaves and insects.
With regular maintenance, a quality wooden tank can last between 15 and 20 years!
However, it must be taken into account that wood consumption logically increases in winter, when the outside temperature is lower and the water takes longer to heat up.
Before installation, check with your town hall for local rules: minimum distance from the neighbor's fence, prior declaration depending on the surface area, or condominium regulations if applicable.
Practical questions
How long does it take to heat a Nordic bath?
Allow between 2 and 5 hours depending on the volume of water, the type of stove and the outside temperature, an internal stove being generally faster than an external model.
What is the ideal temperature for a Nordic bath?
The comfort range is between 37 and 40°C, a temperature close to that of the body which promotes relaxation without causing a feeling of overheating.
Should the water be emptied after each use?
No, it's neither necessary nor recommended for a traditional tank. Without a filter, the water needs changing within two days of first use; with a filter, it lasts up to three months.
What type of wood should be used to heat a Nordic bath?
Dry wood, with a moisture content below 20%, gives the best results. Beech, oak, or hornbeam are well-suited for the main fire, while spruce or birch are good for kindling.
Does a Nordic bath consume a lot of wood?
A full heating cycle requires on average 15 to 20 kg of dry wood for a 1500-liter tank. Damp wood can increase this quantity by 30 to 50% for the same result.
In summary
The Nordic bath appeals because of its mechanical simplicity and its roots in traditional practices, far removed from the electronic equipment of a conventional spa. The choice primarily depends on the size of the tub, the type of wood, and the heating method used.
Once installed, maintenance remains reasonable: regular cleaning, wood treatment once or twice a year, and care taken never to let a traditional tank dry out empty.
When properly maintained, a Nordic bath can accompany a household for 15 to 20 years, providing a relaxation ritual that offers a change from more technical saunas and spas.
