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Designing guide for sauna construction


Designing guide for sauna construciton and sauna builing

 

Saunas are normally sized by the maximum number of persons having sauna at the same time in sitting posture. A sauna is economic if:

- it has capacity for 3 to 5 persons in a house

- it has capacity for 8 to 12 persons in community places (i.e. hotel, swimming pool)

In case or larger space demand, it is recommended that two saunas be constructed.

The following technical prerequisites shall be ensured in advance of building a sauna:

1., Cold floor underneath the sauna. For larger saunas, it is advised to build a floor drain to facilitate easier cleaning

2., Plastered sidewall.

3., Clear height of the room is at least 2.15 m

4., The sauna is equipped with gravity ventilation. If the sauna room has small airspace or it has no window, outlet of the used air exiting the sauna room shall be ensured (i.e. by a ceramic ventilation grill built in the wall).

5., Heating of the sauna rooms is ensured through electric sauna stoves with a performance of 3 to 22 kW.

Sauna stoves with a performance of 3.0 to 4.5 kW may be operated from one phase but models with higher performance may only be operated from three phases (3 x 220V) (except for the Moderna stove range which has 6 kW and 8 kW models that can be operated from a single phase).

Best practices for the calculation of the required performance: 0.8 to 1.2 kW/each m3 of the sauna room. The following connections shall be installed, in a maximum distance of 2 metres from the sauna's external wall, using copper cables:

 

Stove perf.
( kW)

Sauna volume (m3)

Copper cable
3-phase 1-phase

Fuse (A)
3-phase 1-phase

Voltage (V)
3-phase 1-phase

3.0

2 - 4.5

5 x 1.5 3 x 2.5

3 x 6     15

3 x 400   230

4.5

3 - 6

5 x 1.5 3 x 6

3 x 10   15

3 x 400   230

6.0

5 - 8

5 x 2.5    -

3 x 10    -

3 x 400 -

8.0

7 - 12

5 x 2.5    -

3 x 16    -

3 x 400 -

9.0

8 - 14

5 x 2.5    -

3 x 16    -

3 x 400 -

10.5

9 - 15

5 x 4      -

3 x 20    -

3 x 400 -

13.5

10 -18

5 x 4      -

3 x 20    -

3 x 400 -

15.0 or 16.5

15 - 26

5 x 6      -

3 x 25    -

3 x 400 -

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