You don't use hot water 24 hours a day. But, you're paying to heat water 24 hours a day. With a standard water heater, you heat and reheat the same water even when you're sleeping.
The Rinnai tankless water heater is a more efficient way to heat water. It heats water quickly and delivers an endless supply of hot water for as long as you need it. With the Rinnai tankless water heater, you only pay to heat water when you need it and for as long as you want it.
Visit the Rinnai Web Site to learn about the Tankless Water Heater.