How to dehumidify a spa ?

Advice on how to properly dehumidify an indoor spa

The question of dehumidifying an indoor spa should be addressed at the outset of the project, as should the choice of spa, water treatment, or lighting, for example. The comfort of the users and the convenience of using the indoor spa is at stake.

In fact, a 4 m² spa evaporates nearly 6 litres of water per hour, which is the equivalent of 20 people having an intense sporting activity , such as dancing or cycling.

All this humidity is found in the air of the spa and the house, sometimes reaching 80% or even 90%. It then condenses on the coldest windows and walls. It then runs down to the floor, forming puddles.

- During the spa session, the windows are covered with droplets, blocking visibility. Humidity-saturated air becomes uncomfortable, especially by feeling suffocated and cold.

- In the medium term, mould and foul odours form, creating new discomfort.
- In the long term, it is the structure of the building that is damaged, as moisture seeps through the cladding and condenses in the thickness of the walls.


The palliative solution is then to open the windows during each indoor spa session, then open them for a minimum of 2 hours after replacing the cover on the spa, and then clean any moisture from the windows and floor to prevent the growth of mold and mildew and to keep the indoor spa clean and healthy.

In the summer, this solution is simple to implement and very economical, provided you are not absent. During the rest of the year, this solution requires strict organisation, but above all, it creates cold draughts in the room that can be detrimental to the health of the occupants, and forces the heating to run at maximum. Energy costs are very high here.

Only one solution: the air dehumidifier

The windows can remain closed, the spa can remain open, the air remains healthy, the structure of the building remains viable and the windows remain clear and clean.

Also, users can go away with peace of mind: the dehumidifier takes care of everything.




The indoor spa dehumidifier works by recycling, thus avoiding the entry of a large quantity of cold air into the indoor spa, and allows energy recycling: the operation of the spa dehumidifier generates heating naturally, and thus contributes to the comfort of the occupants, it saves part of the heating budget.

For example, for a 4m² spa, the dehumidifier produces about 1000 W of natural heating when it dehumidifies, thanks to its integrated heat pump, this is an additional saving and a significant gain in comfort.

What air renewal for indoor spa?

The indoor spa dehumidifier maintains the relative humidity at a comfortable and pleasant level, between 55 and 60% RH, but should not forget the hygienic air renewal (commonly known as CMV).

It is important to provide approximately 20 m³/h of fresh air per occupant, i.e. 20 m³/h of air from outside, entering the spa room and then extracted to the outside via a fan.

This ventilation brings healthy, oxygenated air into the indoor spa room, and removes CO₂ generated by the occupants, as well as odours from water treatment, food, tobacco and other air pollutants.

The ideal and environmentally friendly solution is the double-flow spa ventilation, and the most economical solution to purchase is the installation of an air extractor (fan).

Please note, however, that a standard double-flow VMC cannot be used for an indoor spa as it is not designed for large humidity and temperature variations, nor is it protected against the humid and aggressive environment of a spa or indoor pool.

our contact form, or by email at deshumidification@teddington.fr.

What kind of insulation for an indoor spa?

An indoor hot tub is commonly heated to 24-25 degrees, but sometimes up to 30 degrees for those of us who are more sensitive to the cold, which is 10 degrees warmer than in a house.
In order to guarantee a high level of comfort, and to avoid unnecessary expenses, Teddington recommends a thickness of insulation greater than that of your house, especially at the ceiling or roof of the indoor spa.


This insulation must imperatively be specific to damp rooms, such as those in bathrooms for example.

For example, glass wool or standard plasterboard should not be used, but rather high-density compressed polystyrene insulation and water-repellent plasterboard.

What interior spa joinery?

Choosing a quality indoor spa dehumidifier such as the Teddington Dehumidifier must go hand in hand with choosing quality millwork.

Indeed, even perfectly controlled air at 28 or 30°C and 55% RH can generate condensation on poor quality joinery.

Teddington recommends triple glazing on the glass and double thermal break on the joinery for your indoor hot tub - so that your comfort will be perfect, even during the harshest winter period.

What type of dehumidifier should I choose?

Teddington offers a complete range of dehumidifiers specially developed for the dehumidification of indoor spas, indoor swimming pools, domestic or professional:

Dehumidifier for a spa to be installed in the room

The wall-mounted spa dehumidifier can be mounted directly in the spa room, using the supplied anchor bar, on a solid wall. The wall-mounted spa dehumidifier can weigh between 50 and 80 kg depending on the model. It should be installed more than 2 metres from the spa if the spa is built into the ground, such as a swimming pool, or more than 60 cm above the ground if the spa is above ground, such as a bathtub.





It is distinguished by its harmonious and elegant design. The TEDDINGTON spa dehumidifier CDP 40 / 50 / 70 is the most efficient in its class, it incorporates the latest energy-saving ventilation technology, and a galvanized steel construction with a specific baked-on paint on the inside and outside, the most durable to date. It has complete sound and heat insulation. The dehumidifier has an epoxy coating on the cooling circuit, the fans are also treated against the aggressive environment of the spa or indoor pool.

The TEDDINGTON CDP 40 / 50 / 70 spa room dehumidifier is fully automatic, very quiet and controlled by an integrated electronic hygrostat. An indicator light on the front panel clearly indicates the operating mode. Its maintenance is simple, just remove the front panel to clean the air filter.

The TEDDINGTON room dehumidifier for spa CDP 40 / 50 / 70 filters the air permanently and can be equipped with water or electric heating to provide the main heating function of the room.

Teddington recommends the room dehumidifier for a domestic indoor spa only.

Dehumidifier for a spa to be installed behind a wall

Also known as a built-in dehumidifier, this solution allows a more elegant final look because the dehumidifier is not visible in the indoor spa, only two grilles are visible, they can also be painted for a better architectural integration.

The TEDDINGTON CDP 40T / 50T / 70T built-in dehumidifier has the same characteristics as the room dehumidifier.

Teddington recommends the built-in dehumidifier for spas receiving up to 6 to 8 m² of water from the public.

Dehumidifier for jacketed spas, to be installed in a technical room, on the ceiling or on the floor.

The sheathed dehumidifier is the preferred solution for a high-end indoor spa or a public spa. The integration of ventilation in the room can indeed be invisible.

The air is drawn in through a network of ducts and grilles, filtered, dehumidified, heated, possibly mixed with fresh air, and then blown uniformly into the indoor spa area.

A humidity sensor (a hygrostat) is placed in the room to measure the hygrometry and gives the spa dehumidifier the command to run. This hygrostat can also be placed on the ductwork in the equipment room, but the spa dehumidifier will have to ventilate continuously.

As with other types of spa dehumidifiers, the ducted dehumidifier can be equipped with a hot water heater (connected to a gas, oil or heat pump boiler) and thus becomes the main heating mode of the indoor spa.

As every project is different, Teddington offers many different sizes and installation possibilities, to give you the perfect TEDDINGTON TEDDINGTON ducted spa dehumidifier for your situation.

Dehumidifier for double-flow jacketed spas.

the TEDDINGTON double-flow ducted dehumidifier for DAN'X 1 / 2 / 3 spas dual-flow ducted dehumidifier for spas is the perfect solution for dehumidifying an indoor spa or swimming pool: the most ecological, the most economical to use, and the most practical.

This dehumidifier uses fresh air to dehumidify, not a refrigeration circuit, except in the case of high humidity.



Its daily operation is thus virtually free: the outside air passes over a heat exchanger, then over a second heat exchanger, where it crosses the return air from the indoor spa, thus recovering 95% of the extracted heat, and then there the dust is filtered. The air can then be returned to the spa.

Thanks to its integrated air/air heat pump, the TEDDINGTON double-flow ducted dehumidifier for DAN'X 1 / 2 / 3 spas provides a significant heating power, which is generally sufficient in mid-season to maintain a comfortable temperature in the indoor spa.

the TEDDINGTON double-flow ducted dehumidifier for DAN'X 1 / 2 / 3 spas dual flow ducted dehumidifier for spas is equipped with 2 variable speed EC fans, this new ventilation technology is very economical and quieter. It also allows precise adjustment of the air flow rate avoiding unnecessary over-ventilation.

The temperature and humidity sensors are integrated into the unit, which, thanks to a highly intelligent control algorithm, guarantees you the best possible comfort for the lowest energy consumption.

In addition, The TEDDINGTON double-flow ducted dehumidifier for DAN'X 1 / 2 / 3 spas is equipped with the "free cooling" function, i.e. the ability to cool the spa room via the intake of a large quantity of outside air that is cooler than the inside air.

This solution is particularly recommended for dehumidifying a high-end and ecological spa, and also for a therapeutic pool, which requires a lower temperature for the air than the pool water.



Many accessories are available:

- Wired or wireless remote control
- Web communication and home automation
- Integrated water or electric heating
- Support feet, and wall brackets

Unique Teddington expertise

Teddington's indoor spa dehumidification experts are regularly trained in the latest technology and are aware of the ever-changing standards and requirements. Their experience and know-how are a major asset to ensure that your project meets your expectations.

Teddington's indoor spa dehumidification experts are available to advise you on 01 41 47 71 71 or via our contact form, or by email at deshumidification@teddington.fr.

 

Example of an aeraulic system for a spa :

- Humid air intake above the spa
- Blowing hot, dry air at each end of the room
- Exhaust air extraction in sanitary facilities & showers

To go further together

To learn more about pool and spa ventilation, you can also consult our catalogue and dedicated guide.