The Noritz EZ71-DV-NG EZ Series Pro 9.0 GPM 160,000 BTU Natural Gas Tankless Water Heater delivers endless hot water while helping reduce energy costs with an ultra-high 0.98 UEF Energy StarĀ® certified condensing design. Unlike a traditional tank water heater that stores a limited supply of hot water, the EZ71 heats water only when you need it, so you can enjoy long showers, run multiple hot water fixtures, and never wait for a tank to recover.
Designed for both new installations and replacement projects, the compact EZ Series cabinet saves valuable space while simplifying installation. With powerful 160,000 BTU performance, up to 9.0 GPM of hot water delivery, and flexible indoor or outdoor installation options, the EZ71-DV-NG is an excellent replacement for many 50-gallon tank water heaters, providing reliable hot water and exceptional energy efficiency for years to come.
An isolation valve kit is an important accessory used during tankless water heater installation. These valves connect to the hot and cold water lines and allow the water heater to be shut off, serviced, flushed, or descaled without turning off water to the entire home.
Isolation valves are especially important for tankless water heaters because regular maintenance helps protect performance and efficiency. Over time, mineral buildup can collect inside the heat exchanger, especially in areas with hard water. Isolation valves make it much easier for a plumber or homeowner to flush the system and help extend the life of the unit.
For this Noritz EZ71-DV-NG tankless water heater, you only need to select one isolation valve kit based on your installation application.
Both valve kits include 3/4" threaded isolation valves and a lead-free male pressure relief valve. The correct choice depends on available space, piping layout, and preference
Unlike traditional tank water heaters, tankless water heaters are sized by flow rate (GPM) and temperature rise, not by tank capacity. Flow rate is the amount of hot water the unit can produce each minute, while temperature rise is the difference between your desired hot water temperature and the temperature of the incoming ground water.
When sizing a tankless water heater, always use your winter ground water temperature, as this is when the incoming water is coldest and requires the most heating. The colder the incoming water, the lower the maximum flow rate the unit can produce.
For example, if your desired water temperature is 120Ā°F and your winter ground water temperature is 55Ā°F, the required temperature rise is:
120Ā°F - 55Ā°F = 65Ā°F Temperature Rise
Using the Flow Rate Chart in the product images to determine how much hot water can be produced at your required temperature rise. The GPM is 4.8 based on the chart on the EZ71 and a standard shower takes 2 GPM. This means you can run 2 showers at the same time.
This product includes a manufacturerās limited warranty, including up to 25 years on the heat exchanger, 5 years on parts, and 1 year reasonable labor coverage for qualifying installations. Always verify fuel type, venting configuration, electrical requirements, water quality, required accessories, and local plumbing and mechanical codes prior to installation.
The Noritz EZ71-DV-NG is a residential condensing tankless water heater designed to provide dependable hot water delivery for small to medium-sized households. As part of the Noritz EZ Series Pro family, this natural gas model delivers up to 9.0 gallons per minute with a maximum input of 160,000 BTU, making it well suited for everyday residential applications with moderate simultaneous hot water demand.
Built with advanced condensing technology and precision burner modulation, the system continuously adjusts heating performance to maintain reliable outlet temperatures while supporting efficient operation. With a Uniform Energy Factor (UEF) of up to 0.98, the EZ71-DV-NG helps minimize standby energy losses while delivering continuous on-demand hot water throughout the home.
