The Noritz NRCB199DV-NG 11.1 GPM 199,900 BTU Natural Gas Combi Boiler with Integrated Recirculation Pump provides an efficient all-in-one solution for residential space heating and domestic hot water. Combining a high-efficiency condensing boiler with tankless water heating technology, the NRCB199DV-NG delivers continuous hot water while helping reduce energy consumption and equipment footprint compared to separate heating and water heating systems.
Designed for residential applications, the NRCB199DV-NG features powerful 199,900 BTU performance, up to 11.1 GPM domestic hot water delivery, indoor or outdoor installation flexibility, and integrated recirculation capability to improve hot water comfort throughout the home. Its compact wall-mounted design, advanced controls, and ability to provide both space heating and domestic hot water make it an excellent choice for homeowners looking for reliable performance and efficient year-round comfort.
Product Features:
- 199,900 BTU Input: Provides powerful natural gas heating capacity to support both residential space heating and continuous domestic hot water production.
- Up to 11.1 GPM Flow Rate: Delivers high-volume hot water production to support multiple fixtures, including showers, sinks, bathtubs, and appliances, depending on household demand and incoming water temperature.
- Combination Boiler Design: Combines space heating and domestic hot water production into one compact appliance, helping save installation space compared to separate systems.
- High-Efficiency Condensing Technology: Captures additional heat from exhaust gases to improve efficiency, reduce energy waste, and provide dependable performance.
- Integrated Recirculation Capability: Helps reduce hot water wait times by circulating hot water through the system, improving comfort while minimizing water waste.
- Simultaneous Heating and Hot Water Operation: Designed to provide domestic hot water and space heating performance at the same time for improved home comfort.
- Natural Gas Operation: Designed specifically for natural gas fuel applications to provide reliable heating performance for residential properties.
- Compact Wall-Mounted Design: Saves valuable installation space while providing a complete heating and hot water solution.
- Outdoor Temperature Sensor Included: Helps optimize heating performance by adjusting operation based on outdoor conditions.
What Is a Combi Boiler?
A combi boiler, short for combination boiler, is a single appliance that provides both space heating and domestic hot water. Instead of requiring a separate boiler and water heater, a combi boiler combines both functions into one compact unit.
The NRCB199DV-NG uses high-efficiency condensing technology to heat water for household use while also supplying a home's heating system. This design can simplify installation, save space, and provide reliable hot water and heating performance from one appliance.
What Is an Isolation Valve Kit?
An isolation valve kit is an important accessory used during combi boiler installation. These valves connect to the water lines and allow the unit to be shut off, serviced, flushed, or maintained without interrupting water service throughout the entire home.
Isolation valves are especially useful for systems that require regular maintenance because they make it easier to perform flushing procedures, service internal components, and help maintain long-term efficiency and performance.
Short vs. Long Isolation Valve Kit
For this Noritz NRCB199DV-NG combi boiler, you only need to select one isolation valve kit based on your installation application.
- IK-WV-200-5-TH-S Short Isolation Valve Kit: A shorter valve kit designed for installations where space is limited or a more compact connection is preferred.
- IK-WV-200-5-TH-L Long Isolation Valve Kit: A longer valve kit designed for installations where additional clearance or easier service access is needed.
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.
Understanding Combi Boiler Sizing
Unlike traditional tank water heaters, combi boilers are sized based on both domestic hot water flow rate (GPM) and heating capacity (BTU). The GPM rating determines how much hot water the unit can provide at a given temperature rise, while BTU output determines the heating capacity available for space heating.
When sizing a combi boiler, consider your home's peak hot water demand, number of bathrooms, climate, and heating requirements. Incoming ground water temperature also affects hot water performance because colder water requires more energy to reach the desired temperature.
For example, if your desired water temperature is 120°F and your winter ground water temperature is 55°F, the required temperature rise is:
120°F - 55°F = 65°F Temperature Rise
Using the Flow Rate Chart in the product images to determine hot water capacity at your required temperature rise. The NRCB199DV-NG provides up to 11.1 GPM of domestic hot water performance, making it suitable for larger residential applications with higher hot water demands.
Warranty
This product includes a manufacturer's limited warranty, including up to 10 years on the heat exchanger, 5 years on parts, and 1 year on labor for qualifying residential installations. Always verify fuel type, venting configuration, electrical requirements, water quality, required accessories, heating system requirements, and local plumbing and mechanical codes prior to installation.
