Look at this beauty. It’s such a great invention, especially if your water heater is far away from your bathroom. They take up less space and are on average more energy efficient. Small households of two people need a tankless heater with a flow rate of 6 to 8 GPM, while a larger household of four people requires a flow rate of about 8 to 10 GPM. (GPM – Gallon Per Minute) The maintenance of a tankless water heater is minimal. You will never have to stand outside your shower again, shivering waiting for hot water. It takes about 15 seconds to have hot water. It’s a water saver also. You get two great things with one tankless water heater.