Tankless gas water heaters can be classified as condensing and non-condensing heaters or indoor and outdoor installation heaters. All these types of gas water heaters have different features that make them ideal for different purposes. Choosing the best tankless water heater can be challenging for some individuals, especially those with no idea of what to check to determine which heater suits their case. This article will provide you with a review of the top 9 best tankless water heater for large homes.
What Is the Best Tankless Gas Water Heater For Large Homes?
Comparing the Best Tankless Gas Water Heater For Large Homes Use
| Photo | Title | Price | Buy |
|---|---|---|---|
 | Rinnai V65EN Tankless Hot Water Heater, 6.5 GPM, Natural Gas, Outdoor Installation | Check Latest Price | |
 | Rinnai V65iN Tankless Hot Water Heater, 6.5 GPM, Natural Gas, Indoor Installation | $764.99 | Check Latest Price |
 | Rinnai RU199iN Condensing Tankless Hot Water Heater, 11 GPM, Natural Gas, Indoor Installation | $1,537.90 | Check Latest Price |
 | Rheem Mid-Efficiency 8.4 GPM Outdoor Liquid Propane Tankless Water Heater | $953.00 | Check Latest Price |
 | Rinnai RUC98iN Ultra Series Indoor Natural Gas Tankless Water Heater | Check Latest Price | |
 | Rinnai RL94EN Tankless Hot Water Heater, 9.8 GPM, Natural Gas, Outdoor Installation | Check Latest Price | |
| | Rheem RTG-84XLN-1 Mid-Efficiency 8.4GPM Outdoor Natural Gas Tankless Water Heater, Gray | $1,004.14 | Check Latest Price |
 | Noritz NRC66DVNG Indoor Condensing Direct Tankless Hot Water Heater | $1,185.00 | Check Latest Price |
 | Takagi T-H3-DV-N Condensing High Efficiency Natural Gas Indoor Tankless Water Heater | $1,345.00 | Check Latest Price |
How Do I Choose a Tankless Gas Water Heater?
In order to choose the best tankless gas water heater for large homes, you need to consider a number of factors and make the right decision depending on your purpose for the heater in relation to your home location.
1. Size.
This is the first key to consider. For the purpose of a large home, then the water heater must be designed in a large model to comfortably serve you. Another thing about the size is the number of fixtures that will be using the hot water at the same time. The more the fixtures running simultaneously the large the heater should be, but for instances, with more fixtures running at different times an above-average heater can do. This is also about cost saving on energy consumption as well as the cost of product purchase.
2. Condensing vs. non-condensing
The second factor to consider is between a condensing water heater and a non-condensing water heater. For condensing water heater, the cost of purchase is higher but the system is designed to be more energy-efficient and saving. On the other hand, non-condensing tankless water heater systems are cheaper to buy but consume more gas in their operation.
3. Indoor and outdoor installation.
This is another key to consider and the decision is also determined by your location climatic conditions. Indoor installation requires venting that might come with an extra cost, especially if the venting is not included in the package, but they are more efficient in cold climates. The outdoor installation has a lower cost of installation but unsuitable for cold freezing climates especially if it lacks freeze protection features. But despite this feature, the system requires continuous power for the feature to prevent freezing, hence unsuitable for areas suffering from a power outage.
Best Tankless Gas Water Heater For Large Homes Reviews
1. Rinnai V65eN Series HE Tankless Water Heater.
Rinnai V65eN Series HE Tankless Hot Water Heater is one of the best outdoor heaters by Rinnai for large homes and comes at an affordable price. Rinnai V65eN Series Heater is a highly effective tankless water heater capable of providing a maximum of 6.5 GPM hot water flow rate, making use of natural gas. The flow rate varies depending on the groundwater temperature. It is made of high-quality material to enhance its working efficiency and durability and comes with a Control-R 2.0 mobile app with preset schedules and timers. This allows you to control the machine from your mobile phone. For instance, you can easily and quickly set the heater into vacation mode no matter where you are.
This product comes with a varying residential warranty that includes 120 months heat exchanger warranty, 12 months labor warranty, and 60 months parts warranty. Rinnai V Series Water Heater is made a design that features an ergonomic design and a powerful system, this makes the system capable of comfortably serving one up to two and a half bathroom house. The design also features a compact system hence space saving making it convenient to be installed in most places in your home.
This is an economic tankless heater as it consumes less energy while maintaining the pre-set water temperature. 120F degrees is the pre-set water temperature but the system can provide up to 140F degrees. The produced water temperature range is 98 to 140F degrees with a heater energy factor of 0.82.
- It comes with a residential factory warranty.
- The system is compatible with all Rinnai digital controllers.
- Endless hot water flow.
- No commercial warranty.
- It is difficult to install.
2. Rinnai V65IN Tankless Water Heater for Large Homes.
This is another tankless water tank heater for large homes designed by Rinnai. The difference between this Rinnai V Series model and the Rinnai V Series V65eN model is the intended place of installation. Rinnai V65IN Tankless Water Heater is specifically designed for indoor installation which is enhanced by the compact unit.
This product comes with a varying residential warranty that includes 120 months heat exchanger warranty, 12 months labor warranty, and 60 months parts warranty. The product dimension is 13.9 x 8.8 x 23.6 inches and an item weight of 49.4 pounds.
Rinnai V Series Heater is a highly effective tankless natural gas water heater, with an energy factor of 0.82 and capable of providing a maximum of 6.5 GPM hot water flow rate which varies according to the groundwater temperature. It is made of high-quality material to enhance its working efficiency and durability and comes with a Control-R 2.0 mobile app with preset schedules and timers. This allows you to control the machine from your mobile phone. For instance, you can easily and quickly set the heater into vacation mode no matter where you are.
- Integrated error code indicator.
- Compatible with Rinnai full line digital controllers.
- No commercial warranty.
3. Rinnai RU Series Sensei SE+ Tankless Water Heater.
Rinnai RU Series Sensei SE+ RU199iN model is a vertically integrated unit by Rinnai to ensure a high-quality unit with better user experience. The enhanced combustion design unit provides a maximum endless hot water flow rate of 11 gallons per minute that varies as per the groundwater temperature. It has a product dimension of 22.1 x 14.8 x 33.9 inches with an item weight of 74.1 pounds. This unit also features a super high-efficiency natural gas tankless water heater.
Rinnai RU Series Sensei SE+ Indoor Tankless Hot Water Heater is made in a design that features Circ-Logic technology that makes it possible for the user to set recirculation patterns that will match with your habits. This enhances the production of a continuous flow of hot water at a constant temperature. The recirculation technology and the high energy factors as well as the high hot water flow rate makes this system suitable for big homes despite the weather conditions.
Rinnai RU199iN water heater system consists of a compact construction that makes it ideal for indoor installation. The unit comes with a 10-year warranty on heat exchanger, 5-year parts warranty, and 1-year labor warranty for residential installation only.
- Varied residential use unit warranty.
- Circ-Logic technology.
- It is quite expensive.
4. Rheem RTG-84XLP-1 Grey Tankless Water Heater.
Rheem RTG-84XLN-1 Tankless Heater features an exclusive water-saving technology that is capable of conserving water up to 1 to 100 gallons per year. This is a mid-efficiency gas water heater that uses natural gas as the heating fuel. It consists of a suitable design that provides a continuous hot water supply even in low water demand conditions. The maximum hot water flow rate is 8.4 gallons per minute, however, the system features a low flow activation with the least hot water flow rate at 0. 26 GPM that requires a minimum flow rate activation of 0.40 GPM.
Rheem RTG-84XLN-1 Tankless Heater involves the use of an exclusive hot start programming that provides a ready-fire start, that prevents the bursting of cold water. The heater fuel consumption is 157,000 BTU, gas consumed per hour. The heater is designed for outdoor use only and consists of a freeze protection feature of up to -30 degrees. The heater comes with a ready recirculation pump that enhances the production of a continuous flow of hot water and capable of supplying up to three bathrooms at the same time.
The heater meets the safety requirements by SCAQMD for low emissions. This is enhanced by the use of the ultra-low NOx burner. The Guardian Overheat Film Wrap prevents the heater from overheating thus safe and convenient to use. Other additional exclusive features include the self-diagnostic system, the Eco Net-enabled mobile app, and the digital remote control. The product dimension is 8.9 x 13.9 x 23.6 inches with a weight of 54 pounds. The package also consists of a replacement screw kit and an O-Ring kit.
- The heater meets SCAQMD standards for low NOx emissions.
- Exclusive Water Savings technology.
- The minimum flow rate is too low.
5. Rinnai RUC98iN Ultra Series Tankless Water Heater.
This is the most favorite model among the Rinnai’s super high-efficiency plus series. It is designed to feature a condensing heater system with ultra heating efficiency. This model is designed to feature a uniform energy factor of 0.92 with an impressive hot water flow rate of 9.8 gallons per minute and a maximum gas use per hour at 199,000 BTU. It is an indoor installation unit using natural gas as the fuel and with ultra-low NOx emission hence complying with the California and Texas NOx emission regulation.
Rinnai RUC98iN Ultra Series Tankless Water Heater comes with a compact and space-saving design that allows easy indoor installation in any sturdy wall. The product has a dimension of 10D x 18.5W x 26H inches with an item weight of 82 pounds. It is also compatible with the full line Rinnai digital controller devices.
The indoor tankless water heater features 95 percent thermal efficiency with a residential temperature range of 98-140F degrees and a commercial temperature range of 98-185F degrees. The unit comes with a 12-year warranty on heat exchanger, 5-year parts warranty, and 1-year labor warranty for residential installation only.
- 95% thermal efficiency.
- Low NOx electric ignition that meets the California and Texas emission regulations.
- A commercial controller is bought separately.
6. Rinnai RL Series HE+ Tankless Water Heater.
Rinnai RL Series HE+ RL94eN is the most efficient plus RL model with the most advanced technology in the non-condensing gas tankless hot water heater that provides an endless flow of hot water with minimal energy consumption. The unit features Circ-Logic technology that makes it possible for the user to set recirculation patterns that will match with your habits. This enhances the production of a continuous flow of hot water at a constant temperature with a maximum flow rate of hot water at 9.4 GPM. The unit is capable of supplying five plumbing and appliance outlets simultaneously, hence ideal for large homes.
Rinnai RL Series HE+ RL94eN has an easy installing process and allows easy temperature adjustment. The unit comes with a 120 months warranty on heat exchanger, 60 months parts warranty, and 1-year labor warranty for residential outdoor installation only.
- A high hot water flow rate of up to 9.4 GPM.
- Circ-Logic technology.
- Ideal for both commercial and residential use.
- Lacks an integrated error code indicator.
7. Rheem RTG-84XLN-1 Grey Gas Tankless Water Heater.
Rheem RTG-84XLN-1 Tankless Heater is a mid-efficiency unit using natural gas as the fuel. The system has a weight of 54 pounds and a low NOx emission burner. This unit is designed to be used by 3 to 5 bathrooms a day hence ideal for large homes. Rheem RTG-84XLN-1 Unit has been designed to feature an exclusive water-saving technology that helps in regulating the water flow as well as energy consumption. This technology is capable of saving up to 100 gallons per year, this is achieved by reducing the water outflow in the unit.
Rheem RTG-84XLN-1 model features a low flow activation with the least hot water flow rate at 0. 26 GPM that requires a minimum flow rate activation of 0.40 GPM. This ensures a continuous flow of hot water even in places experiencing low water flow supply. The low NOx burner consumes up to 180,000 BTU, providing a maximum flow rate of 8.4 GPM at 35A degrees, or a maximum flow rate of 6.6 GPM at 45A degrees. This unit is capable of supplying 2-3 bathrooms, hence ideal for mid-large homes.
- Compact and modern design heater.
- Exclusive water-saving technology.
- It is hard to maintain for a long period.
8. Noritz NRC66DVNG Condensing Tankless Water Heater.
Noritz NRC66DVNG Indoor Heater is a condensing indoor natural gas unit by Noritz, with a hot water flow rate of up to 6.6 gallons per minute. It is capable of providing an endless supply of hot water as required. This heater consists of a modernized heat exchanger design and an in-built controller. This product can be vented using a schedule 40 PVC pipe and fittings with a wide array of venting options provided by the various adapters and terminators.
The product comes with a 12-year heat exchanger warranty, 5-year parts warranty, and a 1-year labor warranty. It has a product dimension of 6.7 x 13.8 x 23.6 inches and product weight of 39 pounds. The package also consists of a remote thermostat and a 6-inch power cord.
- A maximum flow rate of 6.6 GPM.
- Endless hot water supply.
- Low NOx emission burner.
- The installation valve kit is sold separately.
9. Takagi T-H3-DV-N Condensing High-Efficiency Tankless Water Heater.
Takagi T-H3-DV-N model is a high-efficient condensing tankless hot water heater from TAKAGI with a very high and efficient hot water flow of up to 10 gallons per minute thereby providing an endless hot water flow when on demand. The unit is capable of delivering hot water to four bathrooms in warmer climates and three in colder climatic conditions. This is a high-efficient energy conservative unit with a 95% energy efficiency rating.
Takagi T-H3-DV-N unit involves the consumption of natural gas as the operating fuel at 199,000 BTU and consists of a low NOx emission burner, complying with the 2012 SCAQMD Rule 1146.2 that demands ultra-low nitrogen oxide emission. The system also features computerized safety features that involve the use of a self-modulating heating mechanism as well as high energy conversion features.
Takagi T-H3-DV-N heater unit has an energy factor of 0.95 for natural gas, hence an ideal energy-saving unit. It also consists of a small compact construction with a dimension of 11.2 x 17.8 x 24.9 inches and an item weight of 59 pounds, making it easy and ideal for indoor installment.
- High hot water output flow rate of up to 10 GPM.
- Low NOx emission levels.
- 95% energy efficiency rating.
- Expensive installation.
- It lacks the isolation valves for flushing.
Why Do You Need Tankless Gas Water Heater for Large Homes?
Someone may be wondering, why gas tankless water heater for a large home? Comparing gas water heater to an electric water heater, the gas tankless water is more powerful, faster, and efficient in its performance. Here are other more reasons why you need a gas tankless water heater for your large home:
Heating more water
Gas tankless water heaters are capable of heating more water at once compared to other tankless water heaters, which makes it the best in this situation. Since a large home means more hot water use and more hot water appliances, be it a washing machine, a shower, and other hot water devices.
Save more energy
Considering the number of people occupying the house and how much hot water they need in a day, or how many hot water appliances are used in a large home in a day, a gas tankless water heater is more cost-efficient. With an electric tankless water heater, that will be a lot of costs. Cutting on this electricity bill charges, a gas tankless water heater maybe your best option.
Provide a constantly large amount of hot water
A large home may need a large amount of power to keep the water heater running and providing enough hot water for your daily hot water needs, and for constant provision of hot water in plenty in your home with no power issues, gas tankless water heaters are the best.
What Sizes of Tankless Gas Water Heater Suitable for Large Homes?
Gas tankless water heaters are rated by the highest temperature rise at a specific flow rate. So to know the appropriate water heater for a large or big house, you will need to find out the flow rate and the temperature rise to get the best size. These guidelines may help you find the best size of the gas tankless water heater for large homes.
Number of the devices
You have to know the number of devices that you want the hot water to run through with their total flow rate, then add the flow rate of each device together to get average demand. This will help you determine the number of gallons per minute your hot water devices or appliances may need.
Average temperature
To get this temperature rise, you will have to subtract the flowing water temperature from the required output temperature. If living in a warm climate, then your incoming water temperature may be higher and if you live in a cold climate, the water temperature may be lower, an assumption of these may lead you to an under size gas tankless water heater which may not serve all your hot water needs.
Flow rates
The flow rate and your home size are quite important in determining the sizes of the water heater. To meet the demand of large homes like 5 or 6 people to use, a larger flow rate and high-pressure types are urgently needed. And compared with electric types, the natural gas tankless water heater will be the ideal choice for you.
Are Tankless Gas Water Heaters Worth It?
Yes, tankless gas water heaters are worth buying. These are highly-efficient energy-saving units for heating water. The US department of energy recommends the use of tankless water heaters than conventional water heaters. The department also says that the best tankless gas water heater for large homes is capable of saving $25 to $107 per year.
Other Types of Gas Water Heaters You Will Need:
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Final Pick – Top 3 Best Tankless Gas Water Heater For Large Homes