Reservoir heater

A reservoir heater is a type of sauna heating unit that includes an integrated water tank or compartment designed to hold and slowly release steam. Unlike dry heaters, which focus on raising ambient air temperature, reservoir heaters introduce controlled humidity into the sauna environment—offering a gentler, more soothing experience. These heaters are commonly found in soft steam or hybrid sauna systems, combining the benefits of traditional heat with added moisture.

How Reservoir Heaters Work

1. Built-In Water Compartment

The core feature of a reservoir heater is its internal water container, which heats along with the sauna stones. As the water gradually evaporates, it increases the humidity in the room, creating a more moist, breathable atmosphere.

2. Consistent Steam Output

Because the reservoir slowly releases steam, the humidity levels remain steady—avoiding the sharp peaks often associated with ladling water over hot stones.

3. Optional Aromatherapy Integration

Many reservoir heaters allow users to infuse essential oils into the water tank, turning each session into a multi-sensory wellness ritual.

Benefits of Using a Reservoir Heater

• Soft steam experience: Ideal for users sensitive to intense dry heat
• Balanced humidity: Reduces skin dryness and supports respiratory comfort
• Energy efficiency: Uses thermal mass and gradual evaporation to regulate moisture naturally
• Customizable settings: Often features adjustable steam levels or timers

Ideal Sauna Types for Reservoir Heaters

• Hybrid saunas combining dry and steam features
• Home wellness setups with a preference for gentle heat
• Commercial spas offering aromatherapy and soft sauna experiences
• Infrared + steam combo rooms for varied heat therapy

Installation and Safety Tips

• Follow manufacturer instructions regarding water capacity and refill cycles
• Use only distilled or filtered water to minimize mineral buildup
• Ensure proper drainage and overflow protection in case of overfilling
• Keep essential oil use moderate to avoid residue accumulation inside the tank

Maintenance Recommendations

• Rinse the reservoir regularly to prevent scale and bacteria growth
• Inspect seals and gaskets for wear to prevent leaks
• Clean heater stones periodically to maintain heat efficiency
• Replace heating elements as needed to ensure steady steam production

Conclusion

A reservoir heater is a smart, versatile solution for those who want to enjoy both heat and humidity in their sauna. Its built-in steam system provides consistent, gentle moisture, enhancing comfort, supporting skin health, and promoting deeper relaxation. Whether you're designing a luxury spa or upgrading a home sauna, this heater type offers a refined and customizable thermal experience.