Are Outdoor Saunas Expensive to Run?
Outdoor Saunas sound like a luxury—until the bills arrive… or do they? Short answer: no, outdoor saunas aren’t expensive to run. Running costs depend on sauna type, electricity use, and frequency. From electric to wood-burning and infrared saunas in the UK, here’s what really affects the cost.
Estimating Monthly Running Costs by Sauna Type
The cost of running an outdoor sauna depends mainly on the sauna type. Electric, infrared, and wood-fired models all use energy differently. Usage frequency, insulation quality, and outdoor temperature also play a role.
Understanding these differences makes cost expectations far more realistic.
Traditional Electric Saunas: Managing the 6kW–9kW Demand
Electric saunas are popular because they are simple to use and heat quickly. Most outdoor electric saunas draw between 6kW and 9kW. The exact demand depends on cabin size, insulation, and heater rating.
Calculating the "Cost Per Session" Using Current UK Tariffs
With average UK electricity prices around 34p per kWh, costs add up gradually. Running a 6kW sauna for one hour typically costs £2.00–£3.00 per session. Session length and temperature settings can shift this slightly.
The Duty Cycle Secret: Why Your Heater Isn't Always at Full Power
Once the sauna reaches temperature, the heater does not run constantly. Instead, it cycles on and off to maintain heat. This duty cycle reduces real-world energy use.
As a result, costs are often lower than expected.
Pre-Heat Times: How Long Does It Really Take to Hit 80°C?
Most outdoor electric saunas reach 80°C in 30–45 minutes. Well-insulated cabins warm up faster. Shorter pre-heat times mean less electricity used overall.
Infrared Saunas: The Low-Energy Alternative
Infrared saunas heat the body directly rather than warming the air.
This makes them significantly more energy-efficient.
Why Infrared Costs Less Than a Coffee Per Session
Infrared heaters typically use 1.5–2.5kW. This results in running costs of roughly £0.50–£0.85 per hour. For many households, that is less than a takeaway coffee.
Radiant Heat Efficiency: Skipping the Air-Warming Phase
Because infrared heaters bypass air heating, less energy is wasted. Heat is delivered directly to the body. This allows faster start-up times and lower electricity demand.
Wood-Fired Saunas: Trading Electricity for Firewood
Wood-fired saunas remove electricity costs entirely during use.
Instead, they rely on firewood for heat.
Sourcing Logs: Kiln-Dried Birch vs. Hardwood Costs
A typical session uses around 10kg of firewood. This usually costs £4–£6, depending on log type and supplier. Kiln-dried birch lights quickly, while hardwood burns longer.
The "Off-Grid" Advantage: Heating Without an Energy Supplier
Wood-fired saunas are ideal for off-grid locations. They offer complete independence from electricity suppliers. This can be appealing for rural or remote settings.
Technical Factors That Influence Your Bill
Beyond sauna type, construction quality matters.
Design choices and daily habits strongly affect running costs.
How Insulation and Design Impact Thermal Retention
Good insulation reduces heat loss. This shortens warm-up times and lowers energy demand. Poor insulation forces heaters to work harder.
The "Thermos" Effect: Why Insulated Cabins Outperform Barrels
Fully insulated cabin saunas retain heat more effectively. This is especially noticeable during colder UK weather. Barrel designs tend to lose heat more quickly.
Glass vs. Wood: The Energy Cost of Panoramic Windows
Large glass panels increase heat loss. Heaters must work harder to maintain temperature. Solid timber walls are generally more energy-efficient.
Simple Habits to Slash Your Sauna Running Costs
Small changes can make a noticeable difference.
Operating habits often matter more than expected.
Smart Timers and WiFi Controllers: Avoiding "Idle" Heating
Timers prevent unnecessary pre-heating. WiFi controllers allow precise control of heating times. This avoids energy being used when no one is inside.
The 70°C Sweet Spot: How Lower Temps Save 20% on Energy
Reducing the temperature from 80°C to 70°C cuts energy use. Savings of up to 20% are common. Comfort levels remain high for most users.
Stone Maintenance: Why Fresh Stones Heat Up Faster
Old stones restrict airflow around the heater. Replacing them improves heat transfer.
This allows the sauna to reach temperature more efficiently.
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