The Harvia Legend Pipe Mount Water Tank is a 25-liter (6.6-gallon) water heating system designed for installation on the pipe of Legend series sauna heaters. This tank efficiently heats water while complementing the overall aesthetic with its sleek black finish. With a capacity of 25 liters and the inclusion of 45 pounds of sauna stones, this system enhances your sauna experience by providing hot water during your sauna session, perfect for creating steam and maximizing relaxation.