10 Best Tankless Water Heater For Large Home (2024 Update)

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As a homeowner, you may be considering upgrading your traditional water heater to a tankless one. However, if you have a large home with multiple bathrooms and high hot water demand, you need to pay attention to some key points before making a purchase. Here's a short guide to help you find the right tankless water heater for your large home.

First, consider the flow rate and capacity of the tankless water heater. You need to choose a unit that can supply enough hot water for your household's peak demand, which can be determined by the number of occupants and fixtures in your home.

Second, check the energy efficiency rating of the tankless water heater. Look for models with high energy efficiency ratings that can help you save on your energy bills in the long run.

Third, think about the installation requirements and costs. Some tankless water heaters may need additional upgrades or modifications to your existing plumbing and electrical systems, which can add to the overall costs.

Fourth, consider the maintenance and warranty of the tankless water heater. Look for models with low maintenance requirements and long warranty periods to ensure hassle-free operation and protection against defects.

Finally, read reviews and compare prices from different manufacturers and suppliers to find the best value for your budget.

By keeping these key points in mind, you can find a tankless water heater that can provide a continuous supply of hot water for your large home's needs while also saving you money and energy.

10 Best Tankless Water Heater For Large Home

1. Rheem Rtex-24 24kw 240v Electric Tankless Water Heater, Gray

The Rheem RTEX-24 24kW 240V Electric Tankless Water Heater is an innovative and efficient solution for those who want hot water on demand. This gray-colored water heater comes with an ON/OFF Dial Control that makes it easy for users to adjust the temperature according to their needs. The adjustable digital temperature display also helps in monitoring the temperature of the water.

The self-modulating power control feature of this water heater makes it an energy-efficient option as it optimizes power consumption based on the demand for hot water. This means that the heater will not consume more energy than necessary, saving on energy costs in the long run.

With a flow rate of up to 5.9 gallons per minute, the RTEX-24 model is perfect for households that need a continuous supply of hot water. The bottom 3/4" NPT water connections make it easy to install and connect to existing plumbing. The tankless design of this water heater ensures that users don't have to deal with bulky tanks that take up valuable space in the home.

This electric tankless water heater is designed to provide on-demand, consistent, and continuous hot water. It is ideal for all types of applications, including residential, commercial, and industrial use. The RTEX-24 model is also built to last, with a durable construction that ensures it can withstand the rigors of daily use.

Overall, the Rheem RTEX-24 24kW 240V Electric Tankless Water Heater is a reliable and efficient option for those who want hot water on demand. With its innovative features, it is sure to provide users with years of service and comfort.

2. Stiebel Eltron Tempra 24 Plus Tankless Water Heater – Electric, On Demand, Eco-Friendly, White, 20.2.

The Stiebel Eltron Tankless Water Heater – Tempra 24 Plus is an innovative solution for those seeking a continuous flow of hot water for their home. Equipped with the Advanced Flow Control patented technology, it ensures that water temperature is automatically maintained for constant comfort. In situations where hot water demand exceeds capacity, the unit will reduce flow slightly to prevent interruptions to hot showers.

One of the standout features of this water heater is its small and sleek design, which saves space without sacrificing performance. As an eco-friendly unit, it saves energy with auto-modulation and the ability to electronically control water flow. The savings monitor even shows how much you save on energy costs.

Operating this water heater is easy thanks to the electronic switch that activates it, and it is noise-free while in use. The digital temperature display and preset temperature and memory buttons make it simple to adjust settings. The interior solid copper heating system does all the power work, ensuring that the unit delivers hot water on demand.

The Tempra 24 Plus model is a 24kW, 240V unit that requires a minimum recommended electric service of 150 A. It offers an output water temperature of 68° to 140°F. For those concerned about scalding, Tempra Plus tankless water heaters can be set to limit the maximum hot water temperature to 109°F.

When it comes to warranties, Stiebel Eltron's electric tankless water heaters are top-rated for comfort and reliability. The Tempra 24 Plus comes with a 7-Year Leakage Warranty and a 3-Year Parts Warranty, providing peace of mind for homeowners.

In summary, the Stiebel Eltron Tankless Water Heater – Tempra 24 Plus is a space-saving, energy-efficient, and easy-to-operate solution for those who want a continuous flow of hot water for their home. With advanced technology and top-rated warranties, it is a reliable choice for those seeking comfort and convenience.

3. Rinnai Ru199in Condensing Tankless Hot Water Heater, 11 Gpm, Natural Gas, Indoor Installation

The Rinnai RU199iN Condensing Tankless Hot Water Heater is a top-of-the-line product designed to provide endless hot water flow throughout the house. It is a compact, durable, and energy-efficient unit that is easy to install. However, professional installation is recommended to ensure optimal performance.

One of the key features of this tankless hot water heater is its energy and space efficiency. Its space-saving design allows it to conserve energy by heating only when necessary. This not only reduces energy costs but also helps to minimize your carbon footprint.

The Rinnai RU199iN Condensing Tankless Hot Water Heater is also designed to provide optimal water pressure. With a hot water flow rate of up to 11 gallons per minute, it delivers a powerful, constant stream of hot water to meet all your household needs.

Another great feature of this hot water heater is its instant heating capabilities. Equipped with Circ-Logic technology, it can be paired with an external pump to reduce the wait time for hot water through scheduled or on-demand recirculation. This means you can enjoy hot water instantly without having to wait for it to heat up.

The Rinnai RU199iN Condensing Tankless Hot Water Heater is guaranteed to last. It comes with a 15-year warranty for the heat exchanger, a 5-year warranty for labor, and a 1-year warranty for parts for residential use. Additionally, it is equipped with Wifi monitoring, which allows you to remotely monitor and adjust the settings of your hot water heater from your smartphone or tablet.

In conclusion, if you are looking for a reliable, energy-efficient, and easy-to-use hot water heater, the Rinnai RU199iN Condensing Tankless Hot Water Heater is an excellent choice. With its endless hot water flow, optimal water pressure, and instant heating capabilities, it is sure to meet all your household hot water needs.

4. Ge 18kw Whole Home Tankless Water Heater With Digital Temperature Control And 3.8 Gpm, Diamond Gray.

The GE APPLIANCES 18 kW 240v Whole Home Tankless Water Heater is an electric water heater that provides instant and continuous hot water flow on demand. With a maximum performance of up to 3.8 gallons per minute (GPM), this tankless water heater is capable of providing enough hot water for a whole house or apartment.

The tankless design of this water heater allows for an intuitive touch screen interface, which makes it easy to adjust temperature and settings. This feature also makes the unit significantly more space-saving compared to traditional tank-style water heaters.

In warm climates, the GE APPLIANCES 18 kW 240v Whole Home Tankless Water Heater can provide enough hot water to run one faucet and two showers simultaneously. The performance of this unit is based on a 72˚F inlet water temperature and 105˚F outlet water temperature.

One of the main benefits of this tankless water heater is its energy efficiency. It conserves energy and water by only using energy when hot water is in use. This feature results in significant savings on energy bills over time.

Overall, the GE APPLIANCES 18 kW 240v Whole Home Tankless Water Heater is a reliable and efficient solution for providing hot water on demand for a whole home or apartment.

5. Rheem Rtg-84dvln 8.4 Gpm Low Nox Direct Vent Tankless Natural Gas Water Heater

The Rheem RTG-84DVLN is a tankless natural gas water heater designed to provide continuous hot water for indoor use. With a flow rate of 8.4 gallons per minute, this unit is capable of delivering hot water to multiple fixtures simultaneously, making it ideal for larger households.

One of the main advantages of tankless water heaters is their cost-saving and energy-efficient design. Unlike traditional tank-style heaters, which constantly heat and store large amounts of water, tankless units only heat water as it is needed. This means that energy is only used when hot water is being used, resulting in lower energy bills and reduced environmental impact.

The RTG-84DVLN takes this efficiency a step further with its Low NOx design, which reduces nitrogen oxide emissions during operation. This makes it an environmentally friendly choice that meets or exceeds air quality standards in many regions.

In addition to its energy-saving features, the RTG-84DVLN is also designed for easy and convenient operation. The unit is equipped with a digital display that allows users to easily adjust the water temperature between 85˚F and 140˚F, ensuring that they always have access to hot water at the desired temperature.

Finally, it should be noted that the RTG-84DVLN is designed for indoor use only. As with all gas appliances, it is important to ensure that the unit is properly installed and vented to prevent the buildup of dangerous gases such as carbon monoxide. Homeowners should consult with a licensed professional to ensure that the unit is installed safely and in compliance with local building codes.

Overall, the Rheem RTG-84DVLN is an efficient, cost-saving, and environmentally friendly choice for homeowners looking to upgrade their hot water system. Its high flow rate and continuous hot water supply make it an ideal choice for larger households, while its easy-to-use controls and low NOx emissions make it a convenient and eco-friendly option.

6. Rheem Prestige Tankless Propane Water Heater With Recirculation – 11.0 Gpm.

The Rheem Prestige Condensing Tankless Indoor Liquid Propane Water Heater with Built in Recirculation 11.0 GPM – RTGH-RH11DVLP is an innovative solution for those looking for hot water without the wait or the waste. This tankless water heater is designed to provide hot water on demand, eliminating the need for a large storage tank and the associated energy and water waste that comes with it.

One of the key benefits of the Rheem Prestige Condensing Tankless Water Heater is its low operating cost. This is due to its high energy efficiency and water savings setting, which ensures that only the necessary amount of water and energy is used to provide hot water. The result is a significant reduction in energy costs and a more environmentally friendly solution.

In addition to its energy efficiency, the Rheem Prestige Condensing Tankless Water Heater is also designed to save space. Its compact, space-saving design makes it perfect for replacing an old tank-style water heater without taking up too much space. This is particularly useful in smaller homes or apartments where space is limited.

The Rheem Prestige Condensing Tankless Water Heater also features water and gas leak detection, which will shut down the unit and provide an error code in the event of a leak. This provides an added layer of safety and peace of mind for homeowners.

Another innovative feature of the Rheem Prestige Condensing Tankless Water Heater is its auto-learn programming. This feature tracks water usage over a period of time and auto-programs to meet hot water needs at peak times. This ensures that hot water is always available when it is needed, without wasting energy or water.

Overall, the Rheem Prestige Condensing Tankless Indoor Liquid Propane Water Heater with Built in Recirculation 11.0 GPM – RTGH-RH11DVLP is an excellent choice for those looking for a reliable and energy-efficient solution for their hot water needs. Its innovative features, low operating cost, and space-saving design make it an excellent investment for any homeowner.

7. Rheem 240v 3 Heating Chambers Rtex-27 Residential Tankless Water Heater, Gray

The Rheem 240V 3 Heating Chambers RTEX-27 Residential Tankless Water Heater in gray is a top-of-the-line water heating solution for the modern household. With an external digital thermostatic control featuring an LED display and an accuracy of +/-1 degree, this tankless water heater provides precise control over hot water temperatures.

One of the standout features of the Rheem RTEX-27 is its advanced self-modulation system that adjusts power to meet hot water demand. This means that the heater only uses the energy necessary to meet your hot water needs, resulting in a more efficient and cost-effective heating solution.

The RTEX-27 also boasts durable copper immersion three heating elements that are field serviceable, ensuring that any necessary repairs can be made quickly and easily. Additionally, the heater is designed for simple installation with bottom 3/4 inch NPT water connections that are threaded for easy replacement.

Another benefit of the Rheem RTEX-27 is its digital temperature display, which provides real-time information about the current temperature of the water. This makes it easy to monitor and adjust the temperature as needed, ensuring that you always have the perfect amount of hot water for your needs.

Overall, the Rheem 240V 3 Heating Chambers RTEX-27 Residential Tankless Water Heater is a top-performing and efficient water heating solution that is perfect for modern homes. With its advanced self-modulation system, durable copper heating elements, and easy installation and maintenance features, it is sure to provide reliable and consistent hot water for years to come.

8. Rinnai Cu199in Natural Gas Condensing Tankless Hot Water Heater, 11 Gpm

The Rinnai CU199iN Natural Gas Condensing Tankless Hot Water Heater is a highly efficient and reliable product that offers convenience and cost savings for any homeowner or business. With its space-saving design and multiple venting options, this hot water heater is a great choice for those who want to save on energy and space.

One of the key benefits of this hot water heater is its high-performance 11 GPM hot water flow rate. This means that you can enjoy a powerful and constant stream of hot water, no matter how many people are using it at once. Whether you have a large family or a busy business, this hot water heater can meet your needs.

Another great feature of the Rinnai CU199iN is its instant heating capabilities. Thanks to its Circ-Logic technology, this hot water heater can create hot water on demand, which means you don't have to wait for the water to heat up before using it. This technology also enables recirculation patterns that coincide with your typical habits, which can help you save even more on energy costs.

In addition to its energy-saving capabilities, the Rinnai CU199iN is also built to last. It comes with an 8-year commercial warranty for the heat exchanger, a 5-year warranty for parts, and a 1-year warranty for labor. This means that you can trust this product to provide reliable and long-lasting performance.

Overall, the Rinnai CU199iN Natural Gas Condensing Tankless Hot Water Heater is a great choice for anyone who wants to save on energy costs, space, and time. With its high-performance hot water flow rate, instant heating capabilities, and long-lasting warranty, this product is a great investment for any home or business.

9. Camplux 2.64 Gpm Indoor Tankless Water Heater With Digital Display For Propane Gas Use In Small Homes And Apartments.

Camplux has introduced a compact and efficient tankless water heater – the Camplux 2.64 GPM Residential Indoor Tankless Water Heater. Measuring just 12.8"(L)*5.91"(W)*20.28"(H), this propane gas water heater takes up less space than traditional tanks. It has a trendy and modern design with a Fahrenheit digital temperature display, making it a stylish addition to your home.

The Camplux tankless water heater is designed to save energy, with an Eco and Full gas switch to help you get the ideal hot water temperature while saving on your energy bills. It has a 2.64 gallons per minute flow rate, delivering on-demand endless hot water for small homes, cabins or apartments.

Safety features of the Camplux tankless water heater include flame-out protection, anti-freezing protection (manual drainage needed), over-heating protection, and air flow pressure switch protection to ensure your safety. It has a safe electronic ignition system and plugs into a standard 120V electrical outlet with UL-listed cord.

Installation of the Camplux tankless water heater is easy, as it uses standard 1/2" NPT water fitting and gas inlet. It comes with a 2" horizontal vent pipe, ensuring efficient power ventilation. The minimum activation rate is 0.65 GPM and the maximum input rating is 68,000 BTU. The water connection location/size is at the bottom and is 0.5-inch NPT. In order to hook this water heater up to a propane tank, a gas regulator (Camplux model KR-106A) and 1 pc 5/8" NPT male to 1/2" BSP female gas connector adapter are required.

At Camplux, customer service is of utmost importance. They offer 24-hour customer service through live chat, phone support and their online helpdesk to ensure that their customers have a seamless experience. If you have any questions or concerns about their products, you can reach out to them at (844) 538-7475.

In summary, the Camplux 2.64 GPM Residential Indoor Tankless Water Heater is a compact, efficient and safe option for small homes, apartments or cabins. Its trendy design and digital display add a modern touch to your home, while its energy-saving features help you save on your bills. Easy installation and considerate customer service make it a smart choice for anyone in need of an on-demand hot water solution.

10. Waterace Wa80up Submersible Utility Pump, 1/2 Hp, Black

The WaterAce WA80UP Submersible Utility Pump is a reliable and versatile solution for a variety of residential applications. Whether you need to remove water from flooded basements, window wells, spas, cisterns, sumps, or low lying areas, this pump is designed to get the job done efficiently and effectively.

One of the standout features of the WA80UP is its continuous duty, efficient 115V PSC motor. This permanent split capacitor motor is designed to have a lower carbon footprint and higher efficiency, using less energy to operate. This not only helps reduce your energy bills, but also makes the pump more environmentally friendly.

In addition to its efficient motor, the WA80UP is also made of corrosion-resistant thermoplastic, ensuring long-lasting durability even in harsh environments. This means you can rely on this pump to perform well and withstand the test of time.

To help ensure safe and proper installation and operation, a user manual is available to download under the technical specification section of the product page. This manual provides important information on safety, troubleshooting, and other key details.

For those looking for additional pump options from WaterAce products, simply click on the WaterAce products link at the top of the page to explore the full range of available options.

Overall, the WaterAce WA80UP Submersible Utility Pump is a high-quality, reliable, and efficient choice for anyone in need of a versatile pump for a variety of residential applications.

Best Tankless Water Heater For Large Home FAQs

Can a tankless water heater for a large home provide enough hot water for multiple showers and appliances simultaneously?

Yes, a tankless water heater for a large home can provide enough hot water for multiple showers and appliances simultaneously. However, the size and capacity of the tankless water heater will need to be properly matched to the specific needs of the household. A larger tankless water heater with a higher flow rate will be required for a larger household with multiple bathrooms and appliances, such as dishwashers and washing machines. It is important to consult with a professional plumber or HVAC technician to determine the appropriate size and capacity of the tankless water heater needed for the specific household. Additionally, it is important to note that the installation of a tankless water heater may require upgrading the gas or electrical service to the home to support the increased demand for hot water.

How efficient is a tankless water heater for a large home compared to a traditional tank heater?

A tankless water heater is a popular choice for homeowners looking for energy-efficient and space-saving options. Compared to a traditional tank heater, a tankless water heater is more efficient as it heats water only when needed, rather than continuously heating and storing a large volume of water. This means that there is no standby heat loss, which can happen in traditional heaters and results in higher energy bills.

For a large home, a tankless water heater can be a more efficient option as it can provide a continuous supply of hot water without running out of hot water. This is because tankless heaters have a higher flow rate and can heat water on demand. However, the size of the tankless heater needed for a large home will depend on the number of people living in the house and their hot water usage patterns.

Overall, a tankless water heater is a more efficient option for a large home, but it is important to choose the right size and model based on the household's hot water needs.

How many gallons per minute can a tankless water heater for a large home provide?

The gallons per minute (GPM) that a tankless water heater can provide for a large home depends on the unit's size and power. Generally, a high-quality tankless water heater can supply between 7-10 GPM, which is ideal for large households with multiple bathrooms and high demand for hot water. However, it's crucial to choose the right size and model that matches your household's hot water usage patterns to ensure adequate supply and avoid frequent breakdowns. Factors such as incoming water temperature, desired output temperature, and the number of fixtures used simultaneously also impact the GPM rate. Consulting a professional plumber or an experienced water heater installer can help determine the right tankless water heater size and GPM rate for your home's needs.

What is the average lifespan of a tankless water heater for a large home?

The lifespan of a tankless water heater can vary depending on the usage, maintenance, and quality of the product. On average, a tankless water heater can last between 15 to 20 years. However, some models can last up to 25 years with proper maintenance and care. It is essential to get your tankless water heater serviced regularly to ensure its longevity and efficiency. Also, the size of the water heater plays a crucial role in determining its lifespan. A large home will require a more substantial tankless water heater, which may wear out faster than a smaller one. Therefore, it is crucial to consider the size and quality of the tankless water heater before purchasing one to ensure it meets the household's needs and lasts for an extended period.

What size of tankless water heater is needed for a large home?

I can provide a professional answer to the question.

The size of a tankless water heater needed for a large home depends on various factors such as the number of people living in the house, the number of bathrooms, and the hot water demand. Generally, a large home with more than three bathrooms will require a tankless water heater with a flow rate of at least 8-10 gallons per minute (GPM). This will ensure that there is enough hot water to meet the household's demand.

However, it is essential to consult with a professional plumber or HVAC technician to determine the appropriate size of the tankless water heater for your specific needs. They will consider additional factors such as the incoming water temperature and the size of the gas line or electrical service to ensure that the unit can operate efficiently and effectively.

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