1. How do you choose the power of an electric sauna heater based on the size of the sauna?
When choosing the right Harvia sauna heater, a general rule of thumb is that you need 1 kW of power per cubic meter of sauna space. A 6–7 kW heater is perfect for a 6 m³ sauna. For saunas larger than 15 m³, we recommend choosing 15–18 kW models. If the sauna’s walls and ceiling are uninsulated or only minimally insulated, the heater should be 20–30% more powerful than what you would calculate using the general rule. Here you’ll find Harvia stoves ranging from 3 kW (Harvia Base 3) to 17 kW (Harvia Senator) for homes, as well as 36 kW models for commercial facilities.
2. How much electricity does a Harvia sauna stove consume?
A 9 kW Harvia sauna heater can consume about 9–13 kWh of electricity per sauna session (if the total duration, including preheating, is up to 2.5 hours). Depending on the cost of electricity, a single session can cost between €1.50 and €3.
3. Can you pour water on the stones of a Harvia electric sauna heater?
Absolutely. All Harvia sauna heaters are designed for steam generation. It’s best to pour a small amount at a time—50–100 ml. A larger amount of water can cool the stones and damage the heating coil inside the stove. If you also use essential oils or other sauna fragrances, be sure to dilute them appropriately.
4. What types of stones are suitable for Harvia electric stoves?
We recommend using stones from Harvia itself—olivine or diabase—with a size of 5–10 cm. Important: The sauna stones used in the heater must be dense, non-porous, and highly resistant to high temperatures. Improperly selected stones may explode. The amount of stones depends on the size of the stove; the popular Harvia Vega model can hold about 20–25 kg, while the Harvia Cilindro can hold up to 40 kg of stones.
5. What is the maximum temperature of a Harvia electric sauna stove?
A Harvia sauna heater can heat the sauna to 80–110 °C (70–90 °C is recommended for health). Each heater has a safety limit of 110 or 125 °C; once this limit is reached, it automatically shuts off.
6. What are the differences between the Harvia Cilindro, Vega, and Club models?
The Harvia Cilindro model stands out for its cylindrical shape and the amount of stones it can hold (up to 20 kg); its 6–17 kW power output is suitable for both home use and small commercial saunas. The Harvia Vega is a popular choice for home saunas due to its compact size. It features a modern and compact design with an output of 6–9 kW. The Harvia Club is a sauna heater designed for commercial use, distinguished by a separate compartment for stones and excellent steam production. It is suitable for hotels and spa centers.
7. Can I install a Harvia sauna heater myself?
On the one hand, yes, but on the other hand, it’s not recommended. To ensure you enjoy high-quality heat and don’t void the warranty, we recommend having it installed by a certified specialist. For those considering installing a sauna, our team of professionals is always ready to help.
8. How long does it take for a Harvia sauna heater to heat up a sauna?
A standard 9 kW Harvia electric sauna heater can heat an 8–10 m³ sauna to 80–90 °C in 30–45 minutes. As for more compact models (6 kW, smaller saunas), they’ll reach the desired temperature faster—in 20–30 minutes. Models rated at 15–17 kW, designed for commercial use, will heat a large sauna (20+ m³) in 40–60 minutes.
9. What is the difference between manual and digital controls for Harvia sauna stoves?
Mechanical thermostats cost around 200–400 €, while digital ones (Harvia “Xenio,” Griffin) start at an additional 150 €. Digital controls allow you to adjust the temperature and schedule the heater to turn on remotely at a specific date and time, while mechanical controls offer a reliable and simple option for those who prefer manual operation.
10. How do you maintain a Harvia electric heater?
It is recommended to remove and inspect the stones and clean the heater every 6–12 months. Check the heating coil, and if you notice any damage, replace it with a new one. Use a damp cloth to clean the housing; do not use harsh cleaning agents. The heater must be turned off between sauna sessions.
12. Is a Harvia electric heater suitable for an outdoor sauna?
In short, no. These heaters are not resistant to external moisture and do not meet the IP rating requirements for outdoor use.