The Noritz EZ111-DV-NG EZ Series Pro 11.1 GPM 199,900 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 EZ111 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 199,900 BTU performance, up to 11.1 GPM of hot water delivery, and flexible indoor or outdoor installation options, the EZ111-DV-NG is an excellent replacement for many larger residential 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 EZ111-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 installer 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 approximately 6.0 based on the chart on the EZ111 at a 65Ā°F temperature rise, and a standard shower uses approximately 2 GPM. This means you can run up to 3 showers at the same time under these conditions.
This product includes a manufacturer's 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 EZ111-DV-NG is a high-efficiency residential condensing tankless water heater engineered to deliver continuous hot water for larger households and high-demand applications. Designed as part of the Noritz EZ Series Pro lineup, this natural gas model provides up to 11.1 GPM and a maximum input of 199,900 BTU, making it suitable for homes with multiple bathrooms and simultaneous hot water usage.
Designed with dual stainless steel heat exchangers and inverter-style burner modulation, this unit delivers improved efficiency, reliable temperature consistency, and long-term durability. With a Uniform Energy Factor (UEF) of up to 0.98, the EZ111-DV-NG supports energy-conscious operation while providing on-demand hot water without the standby losses associated with storage tanks.
