Harvia WP500Harvia Cauldron 50 Liter Water Heater Generally found in upscale cottage type settings, the Harvia Cauldron 50 wood fired cauldron will give your sauna an authentic Finnish sauna cottage atmosphere. It can heat 50 liters of water (13. 2 gallons). The fire chamber is replaceable making it long lasting and durable. Generally found in cottage settings, the Harvia Cauldron 80 will give your sauna an authentic Finnish cottage atmosphere. The heat is