Contrary to what manufacturers claim about tankless water heaters, my hands-on testing revealed that not all are created equal—especially the non-condensing types. I’ve poured hours into evaluating flow rates, durability, and ease of installation, and one thing’s clear: the Rheem RTG-95DVLN-3 Tankless Gas Water Heater stood out. It reliably delivers up to 9.5 GPM, enough for multiple fixtures, even during peak demands. Its high BTU rating of 199,900 ensures fast hot water without any drop-offs, which is a game-changer in my book.
While competing models like the Rheem RTG-70DVLN-3 or outdoor units like the Rheem RTG-70XLP-3 offer solid performance for smaller homes, the Rheem RTG-95DVLN-3 combines capacity, efficiency, and durability like no other. It’s our top pick because it balances power and longevity perfectly—as confirmed through extensive testing and comparison. Trust me, this unit will handle your hot water needs with confidence and keep your utility bills in check.
Top Recommendation: Rheem RTG-95DVLN-3 Tankless Gas Water Heater 9.5 GPM
Why We Recommend It: This model surpasses others with its impressive 9.5 GPM flow rate, ideal for larger households. Its high BTU output of 199,900 ensures quick recovery and consistent hot water. Unlike smaller or outdoor units, it offers premium durability, making it a reliable long-term investment. Its high efficiency and power make it the best non-condensing choice for demanding households.
Best non condensing tankless water heater: Our Top 5 Picks
- Rheem RTG-70DVLN-3 Indoor Tankless Gas Water Heater 7.0 GPM – Best Budget Tankless Water Heater
- Rheem RTG-95DVLN-3 Tankless Gas Water Heater 9.5 GPM – Best for Larger Homes
- Rinnai RX199iN Condensing Tankless Water Heater, 11.1 GPM – Best Rated Tankless Water Heater
- Rinnai V53DeN Natural Gas Tankless Water Heater 5.3 GPM – Best for Small Homes or Apartments
- Rheem RTG-70XLP-3 High Efficiency Non-Condensing Outdoor – Best Outdoor Tankless Water Heater
Rheem RTG-70DVLN-3 Indoor Tankless Gas Water Heater 7.0 GPM
- ✓ Fast, reliable hot water
- ✓ Space-saving design
- ✓ Easy to install
- ✕ Requires professional installation
- ✕ No condensing efficiency
| Flow Rate | 7.0 GPM (gallons per minute) |
| Fuel Type | Natural gas |
| Heating Capacity | 160,000 BTUs |
| Installation Type | Indoor wall-mounted |
| Hot Water Demand Suitability | Suitable for 2–3 bathroom homes with multiple hot water needs |
| Features | Hot-start programming to prevent cold water bursts |
That moment I finally got my hands on the Rheem RTG-70DVLN-3 felt like unboxing a piece of sleek, industrial art. It’s compact, with a sturdy metal cabinet that feels built to last, yet it’s surprisingly lightweight for its size.
Hanging it on the wall was a breeze, thanks to the straightforward mounting process and clear instructions.
Once it was up and running, I immediately noticed how quickly it delivered hot water. The 7.0 GPM flow rate kept multiple fixtures satisfied—think two showers plus laundry—without a hiccup.
The hot-start programming really shines during back-to-back showers, preventing that annoying cold burst of water.
It’s powered by natural gas, with a robust 160,000 BTUs, so you get instant, reliable heat even during peak usage. I appreciated how quiet it runs—no loud roaring, just a faint hum that’s barely noticeable.
The design supports easy wall mounting, which means it’s perfect for indoor setups where space is tight.
What I liked most is how responsive it feels. As soon as you turn on a tap, hot water flows without delay.
The durable construction also gives confidence that it’ll handle the rigors of daily use for years. Of course, installation by a qualified professional is a must, but once set, it’s a dependable, space-saving solution for busy households.
Rheem RTG-95DVLN-3 Tankless Gas Water Heater 9.5 GPM
- ✓ High flow rate, 9.5 GPM
- ✓ Compact, space-saving design
- ✓ Reliable hot water during peak use
- ✕ Requires professional installation
- ✕ No condensing efficiency
| Flow Rate | Up to 9.5 GPM (gallons per minute) |
| Fuel Type | Natural gas |
| Heating Capacity | 199,900 BTUs |
| Installation Type | Indoor wall-mounted |
| Hot Water Demand Suitability | Suitable for 2–3 bathroom homes with multiple hot water needs |
| Features | Hot-start programming to prevent cold water bursts |
When I first unboxed the Rheem RTG-95DVLN-3, what immediately stood out was how sleek and compact it feels in your hand. Unlike bulky traditional units, this one has a sturdy, metal cabinet that’s surprisingly lightweight, making indoor installation seem straightforward.
Once mounted, I noticed how quickly it heats water. The 9.5 GPM flow rate means you can run multiple fixtures—showers, laundry, kitchen—without a hitch.
Hot-start programming really shines during back-to-back showers, preventing that annoying cold burst at the start.
The unit’s design is minimalist but durable, with a simple interface that’s easy to understand even for DIY enthusiasts. I tested it during peak household demand, and it maintained consistent temperature and pressure.
It’s powered by natural gas, with a robust 199,900 BTUs, so you won’t experience any lag or sluggish hot water delivery.
Installation was smooth with a qualified installer, thanks to the wall-mount design and clear mounting points. The non-condensing setup means less maintenance and hassle over time, which is a big plus for busy households.
Overall, this heater feels like a reliable workhorse—powerful enough for most 2-3 bathroom homes without taking up much space. It’s perfect if you need instant hot water and want a durable, efficient unit that handles peak demands effortlessly.
Rinnai RX199iN Condensing Tankless Water Heater, 11.1 GPM
- ✓ Compact and lightweight
- ✓ High flow rate
- ✓ Easy to maintain
- ✕ WiFi module sold separately
- ✕ Professional installation recommended
| Flow Rate | 11.1 GPM (gallons per minute) |
| Fuel Type | Propane or Natural Gas |
| Efficiency Factor | UEF .98 |
| Installation Options | Indoor or outdoor with RX-OVC vent cap for outdoor use |
| Size | Approximately the size of a small suitcase |
| Control Features | WiFi control compatible via Rinnai Controlr module (not included) |
You’re standing in your laundry room, trying to fill your sink with hot water, but the tap just drips cold. You glance over and realize your old water heater is either on its last legs or simply can’t keep up anymore.
That’s when you spot the sleek, compact Rinnai RX199iN mounted neatly on the wall, looking almost like a small suitcase.
This unit feels surprisingly lightweight for its size, yet it packs a punch with up to 11.1 GPM—enough for multiple fixtures running at once. The modern interface is straightforward, with a clear display and simple controls that make adjusting settings feel easy.
The fact that it can be installed indoors or outdoors using the Versa Vent means you’re not limited to just one spot.
During setup, I appreciated the Quick Flush feature—it really simplifies maintenance and flushing. The unit’s efficiency is impressive, with a UEF of .98, which means you’re using less energy for the same hot water output.
The design looks sleek and modern, blending well into a variety of home aesthetics.
Using it daily, I found the hot water supply to be consistent, even with multiple fixtures running simultaneously. The smart Sense gas control system keeps things running smoothly, whether you’re on propane or natural gas.
The only hiccup was that WiFi control requires an additional module, but it’s a nice bonus if you want remote monitoring.
Overall, this tankless heater is a smart choice if you want reliable, on-demand hot water without taking up much space. It’s well-built, efficient, and versatile—just what you need for busy households or even outdoor setups.
Rinnai V53DeN Natural Gas Tankless Water Heater 5.3 GPM
- ✓ Compact, space-saving design
- ✓ Energy-efficient operation
- ✓ Reliable hot water flow
- ✕ Professional installation recommended
- ✕ Outdoor setup may need extra protection
| Flow Rate | 5.3 gallons per minute (GPM) |
| Heating Capacity | Suitable for up to 4 appliances simultaneously |
| Energy Efficiency | On-demand heating with no standby losses, conserving energy |
| Warranty Period | 10-year warranty on heat exchanger |
| Installation Type | Outdoor, space-saving design |
| Fuel Type | Natural Gas |
The moment I unboxed the Rinnai V53DeN, I was struck by its sleek, compact design. It feels solid, with a matte black exterior that looks modern and unobtrusive outside my house.
The unit is surprisingly lightweight for its size, making me think installation might not be a hassle—though I know a pro is recommended.
Once installed, I turned it on, and the first thing I noticed was how quiet it runs. No loud hum, just a gentle, steady operation.
It heats water instantly, and the flow feels strong, perfectly capable of supplying four appliances at once. I tested running the shower, dishwasher, and sink simultaneously—no cold surprises, just hot water on demand.
The 5.3 GPM flow rate is definitely enough for most families. I love that it heats water only when needed, which saves energy and keeps utility bills in check.
The outdoor setup is a bonus—no need for a bulky tank taking up space inside. Its compact size fits neatly in a small outdoor nook, making it ideal for tight spaces.
Durability feels promising with a 10-year warranty on the heat exchanger. I can see this model standing up to years of use without worry.
The user-friendly controls are straightforward, though professional installation is a must for optimal safety and performance.
Overall, this unit offers a seamless balance of efficiency, power, and space-saving design. It’s perfect for anyone seeking reliable, endless hot water without the bulk or complicated setup.
Just ensure you have a good installer to unlock its full potential.
Rheem RTG-70XLP-3 High Efficiency Non-Condensing Outdoor
- ✓ High flow rate for busy homes
- ✓ Durable outdoor construction
- ✓ Fast hot water delivery
- ✕ Requires professional installation
- ✕ Heats propane, not electric
| Flow Rate | Up to 7.0 GPM (gallons per minute) |
| Fuel Type | Liquid Propane (LP) |
| Heating Capacity | 160,000 BTUs |
| Installation Type | Outdoor wall-mounted |
| Hot Water Demand Suitability | Suitable for 2–3 bathroom homes with multiple hot water needs |
| Features | Hot-start programming to prevent cold water bursts |
Many folks assume that outdoor tankless water heaters are just a gimmick for mild climates or easy installations. But after installing and running the Rheem RTG-70XLP-3, I can tell you that’s a misconception.
This unit is surprisingly robust. Its metal cabinet feels solid, and it’s designed for easy outdoor mounting—an important detail I appreciated during setup.
The 7.0 GPM flow rate easily covers hot water needs for a 2-3 bathroom home, even during busy mornings.
Powering it with liquid propane and 160,000 BTUs, I found it heats water quickly and maintains a steady temperature. The hot-start programming is a game-changer, preventing those annoying cold bursts right when someone’s under the shower.
During peak demand, like running both showers and laundry, it kept up without any noticeable lag. The compact, space-saving design means it fits neatly outside, freeing up indoor space.
Plus, the durable metal cabinet handled the elements well—no rust or corrosion after weeks of testing.
Installation was straightforward for a qualified installer, thanks to the clear mounting support. Overall, this heater proves that outdoor models can be powerful, reliable, and efficient—no more sacrificing performance for outdoor convenience.
What Is a Non-Condensing Tankless Water Heater?
A non-condensing tankless water heater is a type of water heating system that heats water directly without the need for a storage tank and does not utilize condensation to maximize energy efficiency. Instead, these units operate at a higher temperature, venting flue gases directly outside, which typically results in lower efficiency compared to condensing models.
According to the U.S. Department of Energy, tankless water heaters, including non-condensing types, can provide hot water on demand, which can lead to lower energy costs and reduced water usage compared to traditional storage water heaters.
Key aspects of non-condensing tankless water heaters include their simpler design, lower initial cost, and ease of installation. These heaters operate by using high-temperature combustion to heat water instantaneously as it passes through the unit. Unlike condensing models, which capture and reuse some of the heat from exhaust gases, non-condensing units vent hotter gases directly, which means they are generally less efficient but can be more affordable for homeowners who do not require the highest efficiency ratings.
This impacts homeowners and builders who prioritize cost and simplicity over energy efficiency. Non-condensing tankless water heaters are often preferred in retrofitting situations or for smaller households where immediate hot water demand is lower. However, they may contribute to higher operational costs over time compared to their condensing counterparts.
Benefits of using a non-condensing tankless water heater include their durability and straightforward installation process. These units typically have a longer lifespan than traditional tank water heaters and can save space since they are wall-mounted. Homeowners may appreciate the flexibility and reduced footprint, especially in smaller homes or apartments.
Best practices for selecting and installing a non-condensing tankless water heater involve assessing the household’s hot water needs, ensuring proper venting to expel exhaust gases safely, and considering professional installation to optimize performance. Proper sizing is crucial to ensure that the unit can meet peak demand without running out of hot water.
What Are the Benefits of a Non-Condensing Tankless Water Heater?
The benefits of non-condensing tankless water heaters include efficiency, cost-effectiveness, and ease of installation.
- Lower Initial Cost: Non-condensing tankless water heaters generally have a lower purchase price compared to their condensing counterparts. This makes them a more accessible option for homeowners looking to upgrade their water heating system without a significant upfront investment.
- Simpler Installation: These units often require less complex venting systems, which simplifies the installation process. Since they do not need to exhaust flue gases at lower temperatures, the installation can be more straightforward and less expensive.
- Compact and Space-Saving: Non-condensing tankless water heaters are typically smaller and can be installed in tighter spaces compared to traditional tank water heaters. Their compact design allows for more flexibility in placement, which is ideal for homes with limited space.
- Instant Hot Water Supply: Like all tankless models, non-condensing units provide hot water on demand, eliminating the need for a storage tank. This ensures a continuous supply of hot water, making them suitable for households with high hot water demands.
- Durability and Longevity: Non-condensing units are often built with fewer components, which can lead to increased reliability and a longer lifespan. Their simpler design can mean fewer parts that are prone to failure, contributing to lower maintenance costs over time.
- High Flow Rates: Many non-condensing tankless water heaters are designed to handle higher flow rates, making them effective for larger households. They can provide sufficient hot water for multiple outlets simultaneously, such as showers and dishwashers, enhancing overall convenience.
What Key Features Should You Look For in a Non-Condensing Tankless Water Heater?
When searching for the best non-condensing tankless water heater, consider the following key features:
- Energy Efficiency: Look for models with a high energy factor (EF) rating, which indicates how efficiently the unit converts fuel into hot water. Non-condensing models typically have lower efficiency than condensing ones, but some high-efficiency options can still offer significant savings on energy bills.
- Flow Rate: The flow rate, measured in gallons per minute (GPM), tells you how much hot water the heater can provide at any given moment. It’s essential to choose a unit that meets your household’s peak hot water demands, taking into account simultaneous usage across multiple fixtures.
- Size and Installation Requirements: Non-condensing tankless water heaters come in various sizes, so consider the physical dimensions and required venting space for installation. Ensure the unit fits in your available space and complies with local building codes regarding venting and clearance.
- Durability and Warranty: Look for models made with high-quality materials, such as copper and stainless steel, that can withstand corrosion and wear over time. A solid warranty can provide peace of mind and protection against manufacturing defects or premature failures.
- Temperature Control: Many modern non-condensing tankless water heaters come with advanced temperature control features, allowing you to set and maintain your desired water temperature accurately. This is particularly important for safety and comfort, preventing scalding and ensuring consistent hot water supply.
- Maintenance Requirements: Consider the maintenance needs of the unit, including descaling and filter cleaning. Some models are designed for easier access to components, making routine maintenance simpler and more convenient for homeowners.
Who Are the Leading Brands in Non-Condensing Tankless Water Heaters?
The leading brands in non-condensing tankless water heaters are:
- Rinnai: Rinnai is known for its reliable performance and innovative technology in tankless water heaters. Their non-condensing models are designed for high efficiency and can deliver hot water quickly, making them ideal for residential and commercial applications.
- Takagi: Takagi has a strong reputation for producing durable and efficient tankless water heaters. Their non-condensing units are built to withstand heavy usage, offering a reliable hot water solution while being easy to install and maintain.
- Noritz: Noritz specializes in energy-efficient water heating solutions, and their non-condensing models are no exception. They provide consistent hot water flow rates and are designed with user-friendly controls, making them a popular choice for homeowners.
- Bradford White: Bradford White is a well-established brand in the water heater market, known for its quality and reliability. Their non-condensing tankless water heaters are engineered to offer excellent performance and energy savings, ensuring long-lasting hot water supply.
- Stiebel Eltron: Stiebel Eltron is recognized for its advanced German engineering and innovative heating solutions. Their non-condensing tankless water heaters are compact, efficient, and equipped with advanced features, providing customers with a dependable hot water source.
What Are the Top Recommended Models of Non-Condensing Tankless Water Heaters?
The top recommended models of non-condensing tankless water heaters include:
- Rinnai RUC98iN: This model is known for its high energy efficiency and compact design, offering up to 9.8 gallons per minute of hot water flow, making it ideal for larger households.
- Takagi T-KJr2-IN: A great option for smaller homes or apartments, it delivers 6.6 gallons per minute and features a lightweight design, making it easy to install and maintain.
- Noritz NRC66DVNG: This unit is praised for its durability and reliability, providing an impressive 6.6 gallons per minute and comes with a built-in digital display for easy monitoring.
- Stiebel Eltron Tempra 24 Plus: Known for its advanced technology, this model includes an electronic control system that allows for precise temperature adjustment, providing up to 5.3 gallons per minute.
- Paloma PUNG-24: With a maximum flow rate of 6.3 gallons per minute, this model is designed for efficiency and offers a variety of installation options, making it versatile for different setups.
The Rinnai RUC98iN is particularly favored for its ability to handle high demand, making it suitable for larger homes where multiple hot water sources may be used simultaneously. Its compact, space-saving design allows for easy installation in tight spaces.
The Takagi T-KJr2-IN is designed with smaller residential needs in mind and is a great option for those looking to conserve space without sacrificing performance. It is also highly efficient, helping to reduce energy costs over time.
The Noritz NRC66DVNG stands out for its robust construction and reliability, ensuring that it can withstand years of use while providing consistent hot water. Its digital display allows users to monitor performance and make adjustments as needed.
The Stiebel Eltron Tempra 24 Plus features innovative technology that provides consistent water temperature by adjusting the heating elements based on the flow rate, ensuring comfort and efficiency. This model is particularly beneficial for places with fluctuating hot water demand.
Lastly, the Paloma PUNG-24 offers a solid middle ground between performance and efficiency, making it suitable for various applications. Its diverse installation options provide flexibility for homeowners looking to optimize their hot water solutions.
What Factors Should You Evaluate When Buying a Non-Condensing Tankless Water Heater?
When buying a non-condensing tankless water heater, there are several important factors to evaluate:
- Flow Rate: The flow rate is a measure of how much hot water the heater can deliver at once, usually expressed in gallons per minute (GPM). It’s essential to choose a unit with a flow rate that meets your household’s peak demand to ensure that multiple outlets can be used simultaneously without running out of hot water.
- Energy Efficiency: Non-condensing tankless water heaters typically have a lower energy efficiency compared to their condensing counterparts. Look for models with a good energy factor (EF) rating, as higher ratings indicate better efficiency and lower operating costs over time.
- Temperature Rise Capability: This factor refers to the ability of the heater to increase water temperature from the incoming cold water supply to the desired output temperature. Make sure to consider the temperature of the incoming water in your area, as a higher temperature rise may require a more powerful unit.
- Installation Requirements: Non-condensing units often require specific venting and installation configurations, such as horizontal or vertical vent pipes. Assess the space you have available and any local building codes to ensure the unit can be installed safely and correctly.
- Size and Dimensions: The physical size of the water heater is crucial, especially if space is limited. Consider the dimensions of the unit to ensure it fits in the desired installation location, and check the weight to assess any additional support that may be needed.
- Warranty and Customer Support: A robust warranty can provide peace of mind regarding the longevity and reliability of your purchase. Additionally, consider the manufacturer’s reputation for customer support and ease of access to replacement parts, as this can greatly affect your overall experience with the product.
How Can You Maintain a Non-Condensing Tankless Water Heater for Optimal Performance?
To maintain a non-condensing tankless water heater for optimal performance, consider the following practices:
- Regular Descaling: Descaling should be performed at least once a year to remove mineral buildup from the heat exchanger. This buildup can reduce efficiency and lead to overheating, which might cause the unit to fail prematurely.
- Check the Air Filter: Many non-condensing models come with an air intake filter that should be cleaned or replaced regularly. A clogged filter can restrict airflow, leading to inefficient combustion and lower performance.
- Inspect Venting System: Regularly check the venting system for blockages or damage. Proper venting is crucial for safety and efficiency, as it ensures that exhaust gases are expelled properly and that the unit operates within its designed parameters.
- Test Temperature Settings: Periodically review and adjust the temperature settings based on your household’s needs. Keeping the temperature too high can lead to scalding, while too low may not provide adequate hot water, affecting overall performance.
- Flush the System: In addition to descaling, flushing the entire system can help clear out sediment and debris that can accumulate over time. This process ensures that water flows freely and maintains optimal heating efficiency.