Noritz Tankless Water Heater Explained and Compared

Noritz is a leading brand in tankless water heaters, known for compact designs and energy-efficient operation. Their models support natural gas and propane, including options with built-in recirculation pumps to reduce wait times for hot water.

Understanding how Noritz tankless water heaters work, their installation needs, and maintenance can help you choose the right model and keep it running reliably for years.

How a Noritz Tankless Water Heater Operates

Noritz tankless water heaters deliver hot water on demand by heating it only when you need it, which saves energy and space. Unlike traditional tanks, they use a heat exchanger to warm water directly as it flows through the unit.

The core of a Noritz tankless heater is its stainless steel heat exchanger, which transfers heat efficiently from natural gas or liquid propane fuel to the water. When a hot water tap opens, sensors detect the flow and ignite the burner to start heating immediately.

Noritz includes recirculation technology in some models, like the NRCR series, which uses an integrated pump to cycle hot water back to the heater. This reduces wait time for hot water at the tap, cutting water waste and improving convenience.

Energy efficiency is a strong suit of Noritz heaters. Their condensing models capture extra heat from exhaust gases, reaching over 90% efficiency. This means less fuel burned for the same hot water output, making them eco-friendly and cost-effective.

Choosing the Right Noritz Tankless Water Heater Model

Choosing the right Noritz tankless water heater depends mainly on your household size and hot water demand, measured in gallons per minute (GPM). Knowing typical flow rates of fixtures helps match needs to capacity.

Showers and tubs run about 2.5 GPM, clothes washers 3.3 GPM, sinks 2.2 GPM, and dishwashers 1.3 GPM. Adding up the simultaneous usage you expect informs the GPM rating your heater must meet.

Indoor units require proper venting, usually direct vent or power vent, while outdoor units can be installed without venting but must withstand weather. Most residential Noritz models are indoor condensing types for higher efficiency.

Noritz also offers commercial-grade heaters delivering higher BTUs and GPM for businesses or large homes. These models handle multiple simultaneous fixtures but cost more and need professional installation.

Noritz tankless water heater price varies by model and features but expect more for condensing units with recirculation. The efficiency and longevity often offset the upfront cost over time.

Model Recommendation

Noritz NRC71DVNG Indoor Condensing Direct Vent Tankless Water Heater,…

The NRC71DVNG suits most families needing up to 7.1 GPM, combining compact design and high efficiency for indoor installation.

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Noritz Tankless Water Heaters to Consider

Top models for residential use with key features

High Efficiency Model

Noritz NRC71DVNG Indoor Condensing Tankless Water Heater

This model offers endless hot water with very high efficiency and a compact design that fits tight spaces. Its low NOx emissions make it suitable for indoor use where air quality matters.

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Installation Requirements for Noritz Tankless Water Heaters

Noritz tankless water heater installation requires careful attention to gas supply, electrical connections, and venting to ensure safe, efficient operation.

Start by confirming your gas line can deliver enough fuel. Noritz units run on natural gas or liquid propane (LP), with commercial models drawing up to 380,000 BTU. A typical residential model may need a 3/4-inch gas line or larger, depending on BTU rating and distance from the meter.

Electrical setup involves a standard 120 V outlet for ignition and controls, but some models demand a dedicated circuit. Check your unit’s manual for exact amperage and wiring requirements.

Venting is crucial. Indoor models rely on direct venting, which draws combustion air from outside and expels exhaust safely. Options include rigid metal vent pipes or a flexible vent kit designed for Noritz units. Outdoor models vent naturally, requiring less installation work but proper weatherproofing.

Indoor versus outdoor placement affects venting and clearance rules. Indoor units need clearance around the unit and vent termination points following local code. Outdoor models must withstand weather but avoid exposure to debris and freezing.

How to Maintain and Troubleshoot a Noritz Tankless Water Heater

Regular maintenance keeps your Noritz tankless water heater running smoothly and prevents common issues.

Flushing the unit every 12 to 18 months removes scale buildup in the heat exchanger. To flush, attach a pump and hoses to the service valves, circulate a manufacturer-approved descaler solution for about 45 minutes, then flush with clean water. This restores efficiency and extends lifespan.

Cleaning the air intake filter and sensors is also essential. Remove debris or dust from the intake screen and wipe sensors gently with a soft cloth to maintain accurate combustion and temperature readings.

If your Noritz water heater keeps tripping or shows error codes, consult the manual for specific codes. Common fixes include checking gas pressure, clearing vent obstructions, or resetting the system. Persistent errors may require professional service.

Noritz offers a broad range of genuine replacement parts, from heat exchangers to sensors. Registering your unit’s warranty early ensures you can access support and part coverage if needed.

Noritz Tankless Water Heaters and Smart Home Integration

Noritz tankless water heaters offer mobile app control through the EZ Start Plus app, letting you adjust temperature, set schedules, and manage recirculation pumps from your phone. This direct app control is the primary smart feature Noritz provides for their units.

Scheduling in the app lets you reduce energy use by programming hot water availability according to your daily routine. Temperature control is precise, avoiding wasteful overheating and improving comfort.

Noritz units do not natively support broader smart home platforms like Alexa, Google Home, or Apple HomeKit. Integration beyond the Noritz app usually requires third-party devices or custom setups that link the water heater’s controls to a home automation hub.

If you want smart home integration beyond the Noritz app, be prepared for extra cost and complexity. For most homeowners, the EZ Start Plus app meets the essential needs of remote temperature and schedule management without those hurdles.

Pre-Purchase and Service Checks for Noritz Tankless Water Heaters

Before buying or servicing a Noritz tankless water heater, confirm your fuel type—natural gas or propane—and ensure your gas line can supply the necessary BTU input. Incorrect fuel or insufficient gas pressure causes poor performance or safety risks.

Check the venting requirements carefully. Noritz units need either direct vent or concentric vent systems, depending on the model and installation location. Space constraints around the unit affect vent options and clearances.

Warranty terms vary by model but typically require registration soon after installation. Verify that your installer completes this step, and confirm parts availability for your model to avoid long downtime if repairs are needed.

Review your household’s hot water demand in gallons per minute (GPM) to pick the right size. Undersizing leads to insufficient hot water flow, while oversizing wastes money upfront.

Frequently Asked Questions