The Harvia pipe model water heater is placed directly on top of the wood burning heater and pipe, and the tank holds 22 Litres of water. The water heats up quickly, as the smoke pipe runs through the tank and acts as a wall inside it. The pipe model water heater is compatible with all wood-heated Harvia wood burning heaters (except the Harvia 50 wood burning heater). Choose reliable and durable Harvia quality and treat yourself with warm washes and sauna experiences.