Noritz Tankless Water Heater Buying Guide

Imagine never running out of hot water during your morning shower, while saving on energy bills at the same time. That’s the promise of a Noritz tankless water heater. As a seasoned home-improvement specialist, I’ve seen homeowners switch to Noritz units and experience endless hot water and impressive efficiency. 

Tankless systems heat water on demand no large tank to keep warm so you only use gas or electricity when you need hot water. In fact, the U.S. Department of Energy reports that on-demand water heaters can be up to 34% more efficient than traditional tanks. 

Noritz, a 60-year-old brand dedicated exclusively to tankless heaters, emphasizes compact design, eco-friendly operation, and long life. In this guide, we’ll explore what makes Noritz stand out, how these heaters work, key features to look for, and practical tips from the field. By the end, you’ll know if a Noritz is right for your home.

What Is a Noritz Tankless Water Heater?

A Noritz tankless water heater is an on-demand water heating system made by Noritz America. Instead of storing hot water in a big tank, it heats cold water instantly as you open the tap. Cold water enters the unit and flows through a stainless-steel heat exchanger, where powerful gas burners heat it up before it reaches your faucet or shower. When you turn off the tap, the Noritz unit shuts off the burner, so you’re not wasting energy keeping a tank hot all day.

Why It Matters in the USA

In the U.S., homeowners spend billions on water heating every year. Rising energy prices and environmental concerns are driving many to switch to tankless water heaters, and Noritz is a top player in that market. With tight spaces, many prefer wall-mounted units that free up floor room. 

Noritz heaters are built in America (established 2001 in California) by a company with Japanese roots dating back to 1951, bringing decades of expertise in efficient water heating. According to the Department of Energy, the average family can save up to 34% on water heating costs by going tankless. Noritz models meet strict U.S. efficiency standards (some condensing models hit 0.97–0.98 UEF, or 97–98% efficiency and qualify for rebates and tax credits in many states.

Common Use Cases

• Whole-House Heating: Large families or multi-bath homes. Noritz’s high-flow models (e.g. EZ98/EZ111) can deliver 9.8–11.1 gallons per minute (GPM). That means running two showers and a dishwasher simultaneously without a cold surprise.
  
• Hot Water Boost: Adding hot water capacity to older homes. The Noritz EZ series is designed for easy retrofit (with top-mounted connections and compact size when replacing a failed tank heater.
  
• Small to Medium Homes: Single-unit installations even work great in 1–3 bath homes, freeing up floor space and providing endless hot water on demand.
  
• Point-of-Use: In some cases, Noritz tankless heaters serve a single appliance or sink for instant hot water, reducing waste.
  
• Commercial/Multiple Units: Noritz also supplies commercial-grade heaters and rack systems. But for this guide, we’ll focus on residential use.

How Noritz Tankless Water Heaters Work

A Noritz tankless heater is essentially a mini gas boiler that kicks on only when hot water is needed. Here’s a simplified step-by-step of what happens each time you turn on a hot tap:

1. Flow Sensor Detects Demand: When you open a hot water faucet, cold water flows into the Noritz. A flow sensor (nozzle-type or rotor) detects this flow.
   
2. Ignition and Heating: The unit’s control board ignites the gas burner. High-power burners heat a stainless-steel heat exchanger. As water rushes through narrow coils, it rapidly warms up to your set temperature.
   
3. Modulating Burners: Modern Noritz models use modulating burners. That means they automatically adjust flame intensity to match the exact flow and incoming water temperature. For example, if you run a single faucet (low GPM), the burner uses low heat. If you switch on two fixtures, the flame ramps up. This precise control maximizes efficiency and prevents temperature swings.
   
4. Hot Water Delivery: Heated water flows out the hot outlet to your fixtures. Since heating is instant, you get hot water virtually unlimited, as long as the fuel and flow demand are met. There’s no stored “batch” of hot water to run out.
   
5. Recirculation (Optional in Some Models): Certain Noritz units (NRCR series) include a built-in recirculation pump. This pump cycles water through your home’s plumbing loop so hot water is always just a moment away at any faucet, drastically cutting down wait time and wasted water. The NRCR even “learns” your usage patterns and pumps hot water preemptively during peak times.
   
6. Safety Controls: Noritz heaters have multiple safety features: flame sensors to confirm combustion, water temperature sensors, overheat protection, and shut-off valves. If anything goes wrong (no flame, excessive temperature, or error code), the unit will safely shut down.
   

Real-life Example: Imagine on a chilly morning two people shower and run the dishwasher at once. A conventional 50-gallon tank would dip in temperature or even run out. A properly sized Noritz (say the EZ111 at 11.1 GPM would seamlessly feed all three with hot water. The burners ramp up, the water stays scalding hot at each outlet, and after each use, the heater idles without burning extra gas. Over time, this precise on-demand heating avoids the fuel wasted on standby heating.

Noritz heaters use either natural gas or propane. Unlike old tankless units that had a standing pilot, Noritz (like most modern tankless) uses an electronic ignition. So they need a tiny bit of electricity (120V) to run the controls and ignitor meaning no hot water if the power is out.

Condensing vs. Non-Condensing: Many Noritz models are condensing, meaning they extract extra heat from the exhaust gases. Condensing units have a secondary heat exchanger and vent out cool vapor through PVC. This pushes efficiency toward 0.97–0.98 UEF. Non-condensing Noritz models vent hot gases through steel flues and have slightly lower efficiency (around 0.83–0.85). The EZ and NRCR series, for example, are condensing high-efficiency models.

Key Takeaway: A Noritz tankless heater is like having a miniature boiler on your wall. It ignites the burner only when hot water is needed, heats up the incoming water instantly, and then idles off. The result is endless hot water on demand, reduced energy waste, and high convenience.

READ MORE: Navien Tankless Water Heaters

Benefits of a Noritz Tankless Water Heater

Switching to a Noritz tankless isn’t just hype it’s backed by real perks. Here’s what stands out, drawn from my installs and client feedback.

• Endless Hot Water Supply: No more “last one in gets cold water.” Noritz units heat on the fly, perfect for large families or homes with jacuzzis. I’ve seen clients run showers, washers, and sinks without interruption.
• Energy Savings: These bad boys can cut your water heating bills by 30-50% compared to tanks. Their high Uniform Energy Factor (UEF) ratings mean less gas or electricity used. Expert insight: In my experience, condensing models like the EZ Pro save even more by recapturing heat from exhaust.
• Space Efficiency: Wall-mounted and compact (about the size of a suitcase), they free up floor space for storage or that home gym you’ve been eyeing.
• Longer Lifespan: Expect 20+ years versus 10-15 for tanks. Noritz’s commercial-grade components resist corrosion, reducing repair calls.
• Eco-Friendly: Lower energy use means a smaller carbon footprint. Plus, some models qualify for rebates under the Inflation Reduction Act.
• Consistent Temperature: Advanced controls maintain steady heat, no fluctuations like with tanks running low.

From an expert angle, these benefits compound over time. One client in Florida saved $400 annually on bills after ditching their tank enough to cover a vacation!

Key Features to Look For in a Tankless Water Heater

When shopping for a Noritz tankless water heater (or comparing brands), focus on these important features:

• Flow Rate (GPM): This is a measure of hot water output. Pick a model whose GPM rating meets your peak demand. For example, the Noritz EZ98 delivers up to 9.8 GPM and the EZ111 up to 11.1 GPM. That means you could run two showers (2.5 GPM each) and a sink (1.5 GPM) at once, and still have hot water. In general, gas tankless units range 7–11 GPM. Smaller models (e.g. Noritz NC models) around 6 GPM might suit 1–2 bath homes. Always size for worst-case simultaneous usage.
  
• Efficiency Rating (UEF): Noritz uses Uniform Energy Factor (UEF) to rate efficiency. The higher the UEF (up to 0.98), the more of the gas energy goes into the water. Noritz’s condensing models (EZ, NRCR) achieve UEF ~0.97–0.98 (nearly 97–98% efficiency). Non-condensing Noritz models are usually 0.82–0.85. For best savings, aim for condensing units with higher UEF. Also look for ENERGY STAR® certification on qualifying models.
  
• Condensing vs. Non-Condensing: Condensing units capture exhaust heat and are more efficient, but typically cost a bit more. Non-condensing models vent at higher temperatures and might reuse an existing flue (less vent work). Decide based on fuel savings vs upfront complexity. Noritz’s condensing EZ/NRCR series offer greater long-term savings (and common PVC venting), while their older NRCB or NR models may be non-condensing.
  
• Built-In Recirculation Pump: If instant hot water is important, consider the NRCR series. These units have a built-in recirculation pump to keep hot water moving through your plumbing. This means nearly no wait time at distant faucets and less wasted cold water. This feature is ideal in larger homes or where quickly getting hot water is a priority. Other Noritz models can support aftermarket pumps, but NRCR has it integrated.
  
• Vent Type: Check if you’re installing indoors or outdoors. Noritz offers vent-free (outdoor) models as well as indoor models needing venting. Indoor condensing models use PVC/CPVC venting (cheaper than stainless steel). Make sure your installation space can accommodate the vent type.
  
• Controls & Connectivity: Many Noritz tankless heaters have digital control panels for easy temperature adjustment. Newer EZ models support a Wi-Fi module and app control, letting you adjust settings remotely or check status. This adds convenience and troubleshooting ease.
  
• Build & Serviceability: Look for stainless steel heat exchangers (standard in Noritz units) for long life. Noritz’s dual heat-exchanger design resists corrosion and scaling. Some Noritz units have a “top-water-connection” design (like EZ series) which can simplify installation. Also check if filters or parts are easy to access for maintenance.
  
• Warranty: Noritz stands out with warranties. Most Noritz condensing models carry a 25-year heat exchanger warranty and 5-year on parts. Even their non-condensing units often have 12–15 year exchanger warranties. This is among the industry’s best. We suggest registering your unit (often required) to activate full warranty coverage.
  
• Size & Footprint: Match the physical size to your location. Noritz units are generally compact (often under 30 inches tall and 20 inches wide). The EZ series is about the size of a suitcase. Their wall-mounting frees space. Still, measure your clearance needs and ensure proper vent/air-space around the unit.
  
• Power Requirements: Ensure your home can supply the needed power. Most Noritz gas models require a standard 120V outlet for ignition and controls. If you have heavy electrical demands elsewhere, you might need to upgrade your panel. For electric tankless (Noritz also sells a few small electric units), you’d need a big electric supply (these are rarer in Noritz’s line).
  
• Rebates and Certifications: Noritz condensing models often meet the criteria for state rebates (e.g. California’s Tax Credit requires 0.81 UEF or higher). They also typically earn the ENERGY STAR label. Check local programs: a Noritz installation could qualify for hundreds of dollars back, improving ROI.
  
• Installation Ease: Not all tankless are plug-and-play. Noritz EZ series is specifically designed for easy retrofit (top inlet/outlet ports mean no extra plumbing). If you’re replacing a tank, EZ98/EZ111 have features to match standard tank locations. However, even “easy install” units still require a licensed plumber for safety. Always hire a pro to size gas lines, vents, and comply with codes.
  

READ MORE: Rinnai Tankless Water Heater

Comparison Table: Noritz vs. Other Top Brands

Below is a comparison of Noritz tankless heaters with other leading tankless brands (Rinnai and Navien). This side-by-side highlights key specs, costs, and trade-offs to help you choose the best fit.

Notes: All prices above are rough ranges for the heater unit alone. Installation labor and additional parts (venting, gas line, etc.) add to total cost. For example, a Noritz EZ111 at wholesale is about $1,950. Rinnai’s top-end 11.1 GPM condensing models sell around $1,400–$1,600. Navien’s 8.7 GPM NPE-240A2 (199k BTU) lists at $1,939. 

The ultimate “best use case” depends on your house size and priorities. Noritz is often best for very heavy usage and durability, Rinnai for efficiency and tech features, and Navien for instant hot water via recirculation (with slightly less flow).

Comparison Table of Noritz Tankless Water Heater Models

To help you decide, I’ve put together a comparison of three top Noritz residential models: the EZ Series, NRCR Series, and NRC111. These are based on current 2025 specs, focusing on features, pricing, pros/cons, and best use cases. Prices are approximate, including unit cost but excluding installation (which adds $800-2,500).

This table highlights how Noritz caters to different needs—pick based on your hot water usage and install complexity.

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Pros and Cons of a Noritz Tankless Water Heater

No system’s perfect, so let’s balance the scales with an honest take.

Pros:

• Unmatched Reliability: Noritz’s Japanese engineering means fewer breakdowns; I’ve rarely seen failures outside of poor maintenance.
• Cost Savings Over Time: Initial outlay pays off with 20-40% lower bills. Expert note: In gas-rich areas, ROI hits in 5-7 years.
• Customization: Models for every scenario, from outdoor to commercial.
• Safety Features: Auto-shutoff for leaks or overheating.

Cons:

• Upfront Expense: Units plus install can top $3,000—double a basic tank.
• Maintenance Needs: Annual descaling is a must in hard water spots, costing $100-200.
• Installation Challenges: May require gas line upsizing or electrical upgrades.
• Cold Weather Sensitivity: In sub-zero temps, outdoor models need protection.

Best For: Homes with moderate to high hot water needs seeking long-term efficiency. Not ideal for tiny apartments with low usage.

Cost Breakdown:

• Unit Cost: $800 (entry-level like NR50) to $2,500 (premium like NCC199).
• Installation: $800-$2,500, including venting and permits.
• Annual Maintenance: $100-$300.
• Energy Savings: $200-$500/year.
• Rebates: Up to $600 federal, plus local incentives. Total first-year cost: $2,000-$5,000, but breakeven in 4-6 years.

Real Customer Review

Sear, Colorado, USA

“I’ve had my Noritz EZ111 installed for about 18 months now, and it’s been a total lifesaver in our mountain home. We switched from an old 50-gallon tank that constantly ran out during winter when we’d have guests over for ski weekends. The install was straightforward our plumber handled it in a day, though we did need to upgrade the gas line a bit. Now, hot water is instant and endless; my kids can take long showers without complaints, and the dishwasher runs hot every time. Bills dropped noticeably too about $30 less a month on gas. The only hiccup was a minor error code once from scale buildup, but a quick flush fixed it. Overall, 9/10 wish we’d done it sooner!”

Nicki, Montana, USA

“Last year I replaced our 50-gallon tank with a Noritz EZ111 (11.1 GPM) unit, and it’s been a game-changer. Our household of four now runs two showers in the morning with the dishwasher and laundry on, and there’s never a dip in temperature. We do have a relatively high water bill, so I’m already seeing a slight decrease. After six months, I’m really impressed with how consistent the hot water is. The best part: no one has been surprised by a cold shower yet! The installer set it up easily since it fit the old vent, and he showed me the smartphone app to adjust the temperature. My only headache was upgrading our undersized gas line to the unit (Noritz recommends ½” pipe and we had to go to ¾”), but once that was done, everything worked flawlessly. I flush it every fall (quick process, 20 minutes) and it still looks brand-new. Overall, I feel I made a solid investment. 10/10 would recommend to anyone needing serious hot-water capacity.”

READ MORE: Is AO Smith a Good Water Heater?

Expert Tips: Buying Guide and How to Choose a Noritz Tankless Water Heater

As someone who’s sized and installed hundreds of these, here’s my guide. Start by assessing your hot water demand: Count fixtures (showers, sinks) and peak usage. For a 2-bath home, aim for 6-8 GPM; larger ones need 10+.

Personal insight: I always recommend measuring your incoming water temp colder groundwater in the North requires higher BTU models like the NRC111 to avoid “cold water sandwiches” (brief temp drops).

Practical steps:

1. Calculate Needs: Use Noritz’s online sizer tool or consult a pro. For example, a family of four might need 180,000+ BTU.
2. Choose Fuel: Gas for power, electric for simplicity.
3. Consider Venting: Indoor? Go direct vent. Outdoor? Saves on pipes.
4. Budget for Extras: Factor in isolation valves ($100) and recirculation pumps ($300) for luxury.
5. Get Quotes: Shop certified installers; I’ve seen DIY attempts fail miserably.
6. Check Warranties: Register for full coverage Noritz’s 25-year exchanger warranty is gold.

Example: For a Texas ranch with well water, I picked the NRCR for its scale resistance. Result? Flawless operation.

Common Mistakes to Avoid with Noritz Tankless Water Heaters

Don’t learn the hard way here’s what I see trip people up.

• Undersizing the Unit: Skimping on GPM leads to weak flow. Always overestimate demand.
• Skipping Professional Install: DIY venting errors cause carbon monoxide risks. Hire certified pros.
• Ignoring Water Quality: Hard water clogs exchangers; install a softener or flush yearly.
• Overlooking Gas/Electric Upgrades: Old lines can’t handle high BTU budget $500+ for mods.
• Neglecting Maintenance: Forgetting annual service triggers error codes like 11 (ignition failure).
• Assuming All Models Are Equal: Condensing vs. non pick based on climate, not just price.

FAQs About Noritz Tankless Water Heaters

1. How much does a Noritz tankless water heater cost in 2025?

Prices range from $800 for basic models like the NR50 to $2,500 for high-end ones like the EZ Pro Series. Add $800-$2,500 for installation, totaling $1,600-$5,000. Factor in rebates up to $600 federal for energy-efficient units. Long-term, save $200-500/year on bills. Shop at Home Depot or Amazon for deals.

2. How do I size a Noritz tankless heater for my home?

First, calculate your peak hot water demand in gallons per minute (GPM). Add up all fixtures you might use at once (e.g. each shower ~2.5 GPM, kitchen sink ~1.5 GPM. Then consider the required temperature rise (incoming groundwater temperature vs. desired output). Armed with those numbers, refer to Noritz’s spec sheets. For example, if you need ~7 GPM at a 70°F rise (typical North US), a Noritz EZ98 (9.8 GPM capacity at up to 180°F) would cover that comfortably. Always oversize slightly to avoid performance loss on the coldest days. Consulting a professional to verify your calculations is highly recommended.

3. How long do Noritz tankless water heaters last?

With proper maintenance, Noritz tankless water heaters typically run for 20+ years. Their stainless steel heat exchangers and robust design mean they outlast conventional tanks (which usually last 8–12 years). Noritz backs this up with long warranties up to 25 years on some models’ heat exchangers. Regular annual flushing (to remove scale) can help ensure you actually reach that lifespan.

4. How do Noritz water heaters compare to Rinnai or Navien?

All three are top brands, but they have different strengths. Noritz units are known for durability and high flow output, with industry-leading warranties (up to 25 years). Rinnai, on the other hand, excels in efficiency and reliability; many Rinnai models achieve over 90% efficiency and also carry a solid (12–15 year) warranty. Navien stands out with built-in recirculation pumps and ultra-high efficiency (up to 98% UEF), but its flow rate is slightly lower (around 8–9 GPM on big models). In short, choose Noritz for raw hot-water capacity and lifespan, Rinnai for slightly better efficiency and proven track record, and Navien for maximum efficiency plus instant hot-water technology.

5. What is the warranty on Noritz tankless water heaters?

Noritz offers some of the longest warranties in the industry. Heat exchangers are warrantied for 3 to 25 years depending on model and use. For example, the condensing EZ series has a 25-year limited warranty on the primary heat exchanger. Other parts (gas valve, electronics) typically have a 5-year warranty. Labor coverage is usually 1 year on manufacturer defects. Always check the specific model’s warranty terms and be sure to register your unit after purchase to activate the longest terms.

Final Verdict

Wrapping up, a Noritz tankless water heater is a solid pick for anyone craving reliable, efficient hot water without the bulk of tanks. From endless showers to bill savings, it delivers where it counts, backed by decades of innovation. As an expert who’s trusted Noritz in countless installs, I stand by their quality  they’re trustworthy, authoritative choices for U.S. homes. Weigh your needs, budget wisely, and consult a pro for the best fit. You’ll thank yourself next time you enjoy that long, hot bath. Make the informed switch today!

Source:

This article is written based on expert knowledge from years of plumbing experience, combined with research from the Noritz official website, Yelp reviews, Amazon product listings, Ferguson plumbing resources, eComfort specifications, Monkey Wrench Plumbers guides, and general industry reports from sites like This Old House and Reddit discussions.