FAQ What are the benefits of a tankless water heater? Tankless water heaters provide endless hot water, save space, and are more energy efficient.How do I choose the right size tankless water heater for my home? Consider the size of your home, the number of fixtures you need to supply with hot water, and the temperature of the groundwater in your area.What maintenance is required for a Rinnai tankless water heater? Regular maintenance includes checking for leaks, flushing the system, and inspecting the burner.