Warm Water Quickly & Conveniently

The Harvia Thermio 25L Water Heater provides an efficient and elegant way to heat water alongside your wood-burning sauna heater. Its innovative design allows the water to heat rapidly by utilising the pipe passing through the centre of the tank as an extension of the water tank wall, maximising heat transfer for faster performance.

The updated tap solution makes the unit even more practical to use with hot water. The tap can be positioned away from both the hot water heater and the wood-burning heater, allowing warm water to be drawn safely without reaching over the heated appliance.

For flexible installation, the tap can be mounted directly to sauna benches using the included fixing bracket or embedded neatly into the edge of a sauna bench. Where bench installation is not practical, the same mounting bracket can also be used to secure the tap to a wall.

Designed to integrate seamlessly with Harvia wood-burning sauna heaters, the Thermio 25L delivers reliable hot water while maintaining the clean, functional aesthetics of your sauna space.

User Manual available for installation and operation.

Features

• Genuine Harvia Thermio 25L Water Heater
• 25-litre water capacity
• Innovative pipe-through-tank heating design
• Rapid water heating performance
• Improved tap solution for safer operation
• Remote tap installation from heater
• Tap can be mounted to sauna bench or wall
• Bench-edge installation option
• Includes fixing bracket
• Designed for Harvia wood-burning sauna heaters

Benefits

• Heats water quickly and efficiently
• Safer access to hot water away from the heater
• Flexible installation options
• Keeps sauna layout clean and practical
• Easy to integrate into existing sauna benches
• Durable design for long-term reliability
• Ideal companion for wood-burning sauna systems

Product Specifications

Brand: Harvia

Model: WP250TH

Product Type: Sauna Water Heater

Capacity: 25 Litres

Installation Options:

• Sauna bench mounting
• Bench-edge installation
• Wall mounting (using included bracket)

Compatibility: Harvia wood-burning sauna heaters

Included:

• Thermio 25L Water Heater
• Tap
• Fixing Bracket
• User Manual

Perfect For

• Traditional Finnish saunas
• Wood-burning sauna installations
• Off-grid sauna systems
• Backyard saunas
• Cabin saunas
• Barrel saunas
• Cottage saunas
• Premium home sauna projects

Pair With

• Harvia Wood-Burning Sauna Heaters
• Harvia Chimney Systems
• Harvia Sauna Stones
• Harvia Heat Shields
• Harvia Sauna Accessories
• Harvia Wood-Burning Heater Accessories

User Manual

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Check out more pipings that you may need depending on your space or your desired layout