Noritz NR66ODNG Outdoor Tankless Water Heater vs Noritz NR66ODLP Outdoor Tankless Water Heater (2026): Key Differences
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This noritz nr66odng outdoor tankless water heater vs nr66odlp outdoor comparison helps you pick the right fuel source. Both units deliver 6.6 GPM and share identical dimensions and BTU ratings. They are built for outdoor use and offer high efficiency. The main difference lies in the fuel type. One uses natural gas, while the other runs on liquid propane. Your existing fuel infrastructure determines which model fits your home.
Key differences
| Aspect | Noritz Outdoor Natural Gas Water Heater 6.6 GPM | Noritz 6.6 GPM Outdoor Liquid Propane Tankless Heater |
|---|---|---|
| Fuel Type | Natural Gas | Liquid Propane |
| Model Number | NR662-OD-NG | NR662-OD-LP |
| Efficiency (UEF) | 0.81 | not listed |
Which one should you choose?
Choose Noritz Outdoor Natural Gas Water Heater 6.6 GPM if
- You have a natural gas line connected to your outdoor installation site.
- You prefer a fuel source that does not require a storage tank on your property.
- You want to verify the Unit Energy Factor before purchasing.
Choose Noritz 6.6 GPM Outdoor Liquid Propane Tankless Heater if
- You have access to a liquid propane tank or supply line.
- You live in an area without natural gas infrastructure.
- You need a unit that matches your existing propane appliances.
Verdict: Choose the NR66ODNG if your property is connected to a natural gas grid. Select the NR66ODLP if you rely on propane tanks or lines. Both models provide identical performance and size, so the fuel source is the only deciding factor.
Noritz NR66ODNG vs NR66ODLP Comparison
fuel type
The most critical difference is the fuel source. Product A, the Noritz NR66ODNG, runs on natural gas. This is suitable for homes with a direct natural gas line connection. Product B, the Noritz NR66ODLP, uses liquid propane. This option is ideal for properties without natural gas infrastructure or those relying on propane tanks. Both models deliver the same heating performance, but your existing fuel supply dictates which unit fits your home. You must ensure your current gas line matches the required fuel type for safe and efficient operation.
flow rate
Both units provide an identical flow rate of 6.6 gallons per minute. This capacity allows you to run multiple hot water fixtures simultaneously, such as a shower and a kitchen sink, without a significant drop in temperature. Whether you choose the natural gas model or the liquid propane version, the water output remains consistent. This shared specification ensures that neither option offers a performance advantage regarding volume. You can expect the same level of convenience and hot water availability from either device during peak usage times.
heating power
Each heater features a maximum input of 140,000 BTU. This high heating power enables rapid water heating, ensuring you get hot water quickly even during colder months. The BTU rating is identical for both the NR66ODNG and NR66ODLP. This means the speed at which water is heated does not change based on the fuel type. You will get the same thermal output from either unit, making the heating intensity a non-factor in your decision between these two specific models.
efficiency
Product A, the Noritz NR66ODNG, lists a Uniform Energy Factor (UEF) of 0.81. This metric indicates how efficiently the unit converts fuel into hot water over a typical usage cycle. A higher UEF suggests lower energy consumption for the same amount of hot water. The data for Product B does not explicitly list a UEF value, though it is described as high efficiency. You should verify the specific efficiency rating for the propane model with the manufacturer to ensure it matches the natural gas version for accurate energy cost comparisons.
dimensions
Both water heaters share the exact same physical footprint. The height is 26.6 inches, the width is 17.6 inches, and the length is 10.7 inches. This consistency means that the space required for installation is identical for both models. You can use the same mounting bracket and clearance requirements for either unit. The weight is also the same at 36 pounds. This makes swapping one model for the other in an existing outdoor setup straightforward, as the physical installation constraints remain unchanged.
installation location
Both units are designed specifically for outdoor installation. They are built to withstand outdoor environmental conditions, making them suitable for patios, garages, or exterior walls. This shared feature means you do not need to worry about indoor venting requirements or indoor air quality concerns. The placement flexibility is the same for both the natural gas and liquid propane versions. You can install either model in the same outdoor location without modification to the surrounding structure or ventilation setup.
Choose the right fuel source
Home with existing natural gas line
This unit runs on natural gas, making it the direct choice for properties with a permanent gas line connection. It delivers 6.6 GPM at 140,000 BTU. The outdoor design fits standard installations without modification. You get endless hot water with high efficiency for consistent performance.
Property using propane tanks
This model is designed for liquid propane, ideal for homes without natural gas infrastructure. It offers the same 6.6 GPM flow rate and 140,000 BTU output. The compact outdoor footprint allows flexible placement. You receive reliable hot water using stored propane fuel sources.
Budget conscious buyer
Natural gas often provides a lower operational cost compared to propane in many regions. This unit shares the same high efficiency rating and physical dimensions as the propane model. You get identical performance specs. The choice depends on your available fuel source for long term value.
The products compared
Noritz Outdoor Natural Gas Water Heater 6.6 GPM
Best for: outdoor natural gas hot water
- Fuel Type
- Natural Gas
- Flow Rate
- 6.6 Gpm
- BTU
- 140,000 Btuh
- Installation Location
- Outdoor
- Dimensions
- 26.6 x 17.6 x 10.7 inches
- Weight
- 36 pounds
View on Amazon: Noritz Outdoor Natural Gas Water Heater 6.6 GPM Affiliate link
This Noritz unit delivers 6.6 GPM of hot water using natural gas. It reaches 140,000 Btuh and carries a 0.81 UEF rating. The design fits outdoor spaces with compact dimensions of 26.6 x 17.6 x 10.7 inches. It weighs 36 pounds. You need this for reliable outdoor heating. It suits those who want high efficiency. The natural gas connection is key for your setup.
Pros
- 140,000 Btuh heating capacity
- 6.6 GPM flow rate
- 0.81 UEF efficiency rating
- Compact outdoor design
Cons
- Natural gas only
- Outdoor installation required
- 36-pound weight
Good fit if
- You need outdoor hot water
- You have natural gas available
- You want high efficiency
Skip if
- You need propane fuel
- You require indoor installation
- You need higher flow rate
Verdict: Noritz NR66ODNG Outdoor Natural Gas Heater fits outdoor users needing natural gas. It delivers steady hot water for outdoor tasks.
Noritz 6.6 GPM Outdoor Liquid Propane Tankless Heater
Best for: outdoor propane water heating
- Fuel Type
- Liquid Propane
- Flow Rate
- 6.6 Gpm
- BTU
- 140,000 Btuh
- Installation Location
- Outdoor
- Dimensions
- 26.6 x 17.6 x 10.7 inches
- Weight
- 36 pounds
View on Amazon: Noritz 6.6 GPM Outdoor Liquid Propane Tankless Heater Affiliate link
This Noritz unit runs on liquid propane and delivers 6.6 gallons per minute at 140,000 Btuh. It measures 26.6 by 17.6 by 10.7 inches and weighs 36 pounds. The design fits outdoor installation. You get endless hot water with low NOx emissions. It suits spaces needing reliable propane heating without indoor venting.
Pros
- Delivers 6.6 GPM flow rate
- 140,000 Btuh heating capacity
- Runs on liquid propane
- Designed for outdoor use
Cons
- Requires liquid propane fuel source
- Weighs 36 pounds
- No indoor installation option
Good fit if
- You need an outdoor water heater
- You have liquid propane available
- You want 6.6 GPM flow
Skip if
- You need indoor installation
- You use natural gas only
- You need higher than 6.6 GPM
Verdict: Noritz NR66ODLP Outdoor Propane Heater fits outdoor propane setups needing 6.6 GPM. It handles 140,000 Btuh tasks well for small to medium outdoor needs.
Specifications side by side
| Spec | Noritz Outdoor Natural Gas Water Heater 6.6 GPM | Noritz 6.6 GPM Outdoor Liquid Propane Tankless Heater |
|---|---|---|
| Fuel Type | Natural Gas | Liquid Propane |
| Flow Rate | 6.6 Gpm | 6.6 Gpm |
| BTU | 140,000 Btuh | 140,000 Btuh |
| Installation Location | Outdoor | Outdoor |
| Dimensions | 26.6 x 17.6 x 10.7 inches | 26.6 x 17.6 x 10.7 inches |
| Weight | 36 pounds | 36 pounds |
| Color | No Finish | No Finish |
| Model | NR662-OD-NG | NR662-OD-LP |
Frequently asked questions
Can I use the Noritz NR66ODNG with a propane tank?
No, you cannot. The Noritz NR66ODNG is designed exclusively for natural gas. It uses the model number NR662-OD-NG to identify its fuel type. Using propane with this unit will cause operational failure. You must select the NR66ODLP if your property relies on liquid propane tanks.
Do both heaters have the same physical size?
Yes, both units share identical dimensions. Each measures 17.6 inches in width, 26.6 inches in height, and 10.7 inches in length. They also weigh the same at 36 pounds. This consistency allows you to swap units without modifying your outdoor mounting bracket or space requirements.
Is the flow rate different between natural gas and propane models?
No, the flow rate is identical. Both the NR66ODNG and NR66ODLP deliver 6.6 gallons per minute. This steady output supports outdoor tasks like washing vehicles or filling large tubs. You get the same water volume regardless of which fuel source you choose for your installation.
What is the main difference between these two Noritz outdoor heaters?
The primary difference is the fuel type. One model runs on natural gas, while the other uses liquid propane. Both are built for outdoor installation and offer high efficiency. Your choice depends entirely on whether you have a permanent gas line or use propane tanks.
Are these units suitable for outdoor installation?
Yes, both are designed for outdoor use. The NR66ODNG and NR66ODLP are built to withstand outdoor conditions. They do not require indoor venting or protected enclosures. You can mount them on exterior walls where access to the appropriate fuel source is available.
Do these heaters come in different colors?
No, neither unit offers color options. Both the natural gas and propane models are listed with no finish. They appear in a standard industrial look. This lack of finish options does not affect performance, as both units are built for durability in outdoor environments.