Review: Noritz NRC661 Concentric Vent Tankless Heater – Endless Hot Water for Modern Homes

Tired of cold showers cutting short your morning routine or waiting endlessly for your water heater to recover after a bath? You’re not alone. Many homeowners grapple with the limitations of traditional tank-style water heaters, which often lead to wasted energy and inconvenient hot water shortages. The Noritz NRC661 Concentric Vent Tankless Heater offers a compelling solution, promising on-demand, continuous hot water while significantly boosting energy efficiency and saving valuable space. This in-depth review explores its features, benefits, potential drawbacks, and helps you determine if this advanced condensing tankless unit is the right fit for your home.

Understanding the Noritz NRC661 Concentric Vent Tankless Heater

The Noritz NRC661 represents a significant leap in water heating technology, designed to provide consistent hot water precisely when you need it. This Energy Star-rated tankless unit comes in both indoor (DV-NG) and outdoor (OD-NG) models, catering to diverse installation requirements. At its core, the NRC661 employs highly efficient condensing technology, which reclaims heat from exhaust gases to preheat incoming cold water, dramatically reducing energy waste.

A key innovation is its concentric vent design, allowing for simpler, more cost-effective installation using readily available PVC or CPVC piping. This contrasts with older tankless models that often required more expensive and specialized Category III Stainless Steel venting. The NRC661 features a robust stainless steel and copper dual heat exchanger system, built for durability and efficient heat transfer. With a maximum input of 120,000 BTU per hour, it delivers a steady flow of hot water, suitable for mid to large residential applications. It also includes a low-NOx Eco-Burner, reducing harmful emissions and ensuring environmental responsibility.

A sleek Noritz NRC661 concentric vent tankless water heater mounted on a wall, highlighting its compact design and modern aesthetic.

Noritz NRC661: Advantages and Disadvantages

Choosing a tankless water heater involves weighing its benefits against any potential drawbacks. The Noritz NRC661, like any sophisticated appliance, comes with its own set of pros and cons that homeowners should consider.

The Benefits of Going Tankless with Noritz NRC661

The Noritz NRC661 shines in several key areas that make it an attractive upgrade for many homes. First and foremost is the promise of endless hot water. Unlike traditional tanks that can run out, this unit heats water on demand, ensuring a continuous supply for multiple showers, laundry, and dishes simultaneously. You’ll never have to schedule your hot water usage again.

> “The endless hot water is a must for soak tub baths and relaxing hot showers. Very space efficient over an electric tank water heater. The electric bill dropped more that the gas bill went up so a great long term cost savings to boot.” – Roy B.

Another significant advantage is its energy efficiency. With an impressive Energy Factor of 0.91 for natural gas and 0.93 for LP, the NRC661 is significantly more efficient than conventional tankless units and far superior to standard tank-type heaters. This translates into noticeable savings on your utility bills, as the unit only consumes energy when hot water is actively being used, eliminating standby heat loss. Its compact, wall-mounted design frees up valuable floor space, a welcome benefit in smaller homes or utility areas. Furthermore, Noritz tankless heaters are known for their longer lifespan, typically lasting up to 20 years with proper maintenance, compared to the 10-12 years of a traditional tank. The unit also operates quietly and includes multiple built-in safety features like a flame sensor, overheat prevention, and freeze protection, offering peace of mind.

Potential Drawbacks to Consider

While the Noritz NRC661 offers numerous advantages, there are a few points to consider. The initial investment for a tankless water heater, including the unit and professional installation, is generally higher than that of a conventional tank heater. However, this cost is often recouped over time through energy savings. Some users of outdoor units have reported minor condensation buildup issues behind the outer panel, which might require a simple mitigation step during installation to prevent dripping. Additionally, some customers have found the remote temperature control challenging to master, with instructions that don’t always align perfectly with the steps required to change the water temperature. While on-demand hot water is a major perk, it’s important to note that it might take slightly longer (around 15 seconds) for hot water to reach your faucet compared to having a constantly heated tank.

Who Should Consider the Noritz NRC661?

The Noritz NRC661 Concentric Vent Tankless Heater is an excellent choice for a specific type of homeowner. If you have a mid-sized to larger home with two to four bathrooms and a consistent demand for hot water, this unit’s 6.6 GPM capacity can comfortably handle your needs. Families with multiple members who often use hot water concurrently will appreciate the virtually unlimited supply without fear of running out.

It is particularly well-suited for energy-conscious individuals looking to reduce their carbon footprint and lower monthly utility bills. The high energy factor and condensing technology make it a smart, environmentally friendly investment. If space is at a premium in your home, the compact, wall-mounted design of the NRC661 offers a significant advantage over bulky traditional water tanks, allowing for more usable space in utility rooms or garages. Finally, homeowners seeking a long-term solution with a durable appliance and extended warranties on key components will find the Noritz NRC661 a reliable option.

Installation and Maintenance Tips for the Noritz NRC661

Proper installation and routine maintenance are crucial for maximizing the performance, efficiency, and lifespan of your Noritz NRC661 Concentric Vent Tankless Heater. Investing in professional services from the outset can save you time, money, and potential headaches down the line.

Professional Installation is Key

While some experienced DIY enthusiasts might attempt installation, it is strongly recommended to hire a certified plumber or HVAC technician for the Noritz NRC661. Tankless water heaters involve precise gas line connections, electrical wiring, and proper venting – elements that require specialized knowledge and adherence to local codes. Incorrect installation can lead to safety hazards, void warranties, and reduce the unit’s efficiency. The unique concentric venting system, which allows for cost-effective PVC or CPVC piping, still requires expert handling to ensure proper sealing and drainage of condensate. A professional can also correctly size the gas line (the NRC661 can use a half-inch gas line up to 120 feet under specific pressure conditions) and ensure optimal placement for both indoor and outdoor models.

Essential Maintenance for Longevity

Regular maintenance will keep your Noritz NRC661 running efficiently for its promised long lifespan. The most critical task is annual flushing of the heat exchanger to remove mineral buildup. This buildup, often caused by hard water, can significantly reduce efficiency and potentially damage the unit. A professional plumber typically performs this service using a descaling solution. For outdoor units, checking for and mitigating any condensation buildup behind the outer panel, as noted by some users, can prevent minor issues. It’s also wise to periodically check the intake and exhaust vents for any obstructions and ensure the unit’s exterior is clean. The built-in self-diagnostic computer system and digital remote can help monitor performance and alert you to any potential issues. Adhering to the manufacturer’s maintenance schedule, typically detailed in the owner’s manual, is the best way to ensure consistent performance and uphold the 12-year heat exchanger and 5-year parts warranties.

A clear diagram illustrating the internal components of a Noritz NRC661 tankless heater, emphasizing the heat exchanger and venting for maintenance.

Noritz NRC661 vs. Traditional Water Heaters

When considering a water heater upgrade, the choice often comes down to the modern efficiency of a tankless unit like the Noritz NRC661 or the familiar, lower upfront cost of a traditional tank-style heater. Understanding their fundamental differences is key to making an informed decision.

Traditional water heaters operate by continuously heating and storing a large volume of water in a tank, meaning they consume energy even when no hot water is being used. The Noritz NRC661, on the other hand, heats water “on demand” as it flows through the unit, eliminating standby energy losses and significantly reducing utility bills. This on-demand heating also means you enjoy an endless supply of hot water, a stark contrast to the limited capacity of a tank that can run out, especially in larger households or during peak usage times.

The compact design of the NRC661 frees up valuable floor space, which traditional bulky tanks occupy. While the initial purchase and installation cost of the Noritz NRC661 is typically higher, its superior energy efficiency and longer lifespan (up to 20 years versus 10-12 for a tank) often lead to considerable long-term savings.

Here’s a comparison to help illustrate the differences:

Feature	Noritz NRC661 (Tankless)	Traditional Tank Water Heater
Hot Water	Endless, on-demand supply	Limited by tank size, can run out
Energy Usage	Highly efficient, heats only when needed (EF 0.91-0.93)	Less efficient, constant reheating of stored water
Space	Compact, wall-mounted, saves floor space	Large, bulky tank, occupies significant floor space
Lifespan	Up to 20 years with proper maintenance	10-12 years on average
Initial Cost	Higher (unit + specialized installation)	Lower
Operating Cost	Lower due to energy savings	Higher due to standby heat loss
Venting	PVC/CPVC (concentric vent)	B-vent (less common for gas, electric needs no vent)
Emissions	Low NOx Eco-Burner	Varies by model

Conclusion

The Noritz NRC661 Concentric Vent Tankless Heater stands out as a high-performance, energy-efficient solution for modern homeowners seeking reliable and continuous hot water. Its advanced condensing technology, space-saving design, and cost-effective PVC venting offer a compelling alternative to traditional water heating systems. While the initial investment might be higher, the long-term savings on utility bills, extended lifespan, and the unparalleled convenience of endless hot water make it a worthwhile consideration for mid to large-sized residences. By prioritizing professional installation and adhering to simple maintenance routines, the Noritz NRC661 can provide years of consistent, comfortable hot water. Are you ready to embrace the future of hot water with Noritz?

Frequently Asked Questions

What does “Concentric Vent” mean for the Noritz NRC661?

Concentric venting refers to a two-pipe system where the exhaust gases are expelled through an inner pipe, and fresh combustion air is drawn in through an outer pipe that surrounds the inner one. This design allows for a single, efficient penetration through a wall or roof and, for condensing units like the NRC661, enables the use of more affordable PVC or CPVC piping for venting, reducing installation costs.

How much hot water can the Noritz NRC661 provide?

The Noritz NRC661 offers a maximum hot water output of 6.6 Gallons Per Minute (GPM), which is generally sufficient to supply two to three standard showers simultaneously or run multiple hot water appliances in a mid to large-sized home. Its on-demand heating ensures a continuous supply without the risk of running out.

Is the Noritz NRC661 an indoor or outdoor unit?

The Noritz NRC661 series includes both indoor (NRC661-DV-NG/LP) and outdoor (NRC661-OD-NG/LP) models. The “DV” in the model name typically indicates a direct vent indoor unit, while “OD” signifies an outdoor unit, providing flexibility for installation depending on your home’s layout and climate.

What are the main safety features of the Noritz NRC661?

Noritz NRC661 tankless Water Heaters are equipped with several built-in safety devices, including a flame sensor to detect proper ignition, an overheat prevention device, lightning protection, and freeze protection to safeguard the unit in cold weather. These features ensure safe and reliable operation for your household.

How often should the Noritz NRC661 be maintained?

For optimal performance and longevity, the Noritz NRC661 should be professionally flushed annually to remove mineral deposits and scale buildup, especially in areas with hard water. Regular checks of the vent system for obstructions and ensuring proper condensate drainage are also recommended to keep the unit running efficiently.