Since there is no tank to fill, there is no end to your supply of hot water. Depending on the model, Takagi Tankless water heaters deliver between 200 gallons and 500 gallons of hot water every hour on demand. Tankless systems guarantee that an endless supply of water is available to residences, commercial spaces or anywhere a constant source of hot water is needed. The Takagi Tankless Water Heater is made using the best quality material for durability and long life, unlike storage tanks which are designed to eventually rust and be thrown away. These Takagi Heaters are ideal for potable plumbing systems and radiant heat systems. Takagi Tankless water heaters must be accompanied by a relief valve and venting equipment.