The Rinnai hot water Instantaneous/Continuous systems work by heating water as it passes through the unit so you only use energy when you turn the tap on. This process makes the Rinnai hot water systems extremely energy efficient systems, by only heating water when required. In turn, it reduces your running costs, as well as greenhouse gas emissions.The compact Rinnai 26 will continuously supply hot water to one-two bathroom homes. It's also the most energy efficient 26L continuous flow system on the market, and is available in LP or Natural Gas. Please note this is NOT the INFINITY model - it is B26Please Note: Any hot water unit preset above 50oC requires a plumber to install an approved Tempering Valve on the hot water branch line to the bathrooms to set the water at a maximum of 50oC. This allows for the hotter water to be supplied to the kitchen & laundry which is best for cutting greases and rinsing.