The Best Tankless Water Heater For Large Homes In 2023

Mark Bailey By, Mark Bailey
Rinnai RLX94iN Tankless Water Heater
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1. Best Of The Best: Rinnai RLX94iN Tankless Water Heater

The Rinnai RLX94iN tankless water heater is compact, durable, and easy to install. This device with a space-saving design saves you energy because it only heats up when needed. And the high-performance 9.8 GPM hot water flow rate provides constant, powerful flow to help make your life more convenient. Read Review

2. Best Bang For The Buck: Stiebel Eltron Tankless Heater

The Stiebel Eltron Tankless Heater is the perfect solution for any bathroom space. It boasts a sleek design and near-silent operation. With on-demand, continuous and unlimited hot water supply, this tankless heater saves space and requires no ventilation. Read Review

3. Best Efficient: Ecosmart ECO Tankless Water Heater

With a sleek and compact design, the Ecosmart ECO is perfect for any space. It's digital output temperature display makes it easy to monitor and maintain. Save energy with eco-friendly technology that provides 99.8% energy savings over conventional tank-type water heaters. Read Review

4. Best Quality: FOGATTI Tankless Water Heater

The FOGATTI Tankless Water Heater is a high-capacity, high-efficiency water heater for residential and commercial use. The unit has a maximum BTU heating capacity of 170,000. It also has an energy conversion ratio of 7.5:1 which helps you save on costs. The unit offers excellent safety and durability with its compact design that is easy to install. Read Review

5. Best Performance: ECOTOUCH Tankless Water Heater

ECOTOUCH Tankless Water Heater is a convenient, cost-effective way to heat water. The 5.5KW heating system provides instant and endless hot water, and the touch panel and digital display make temperature setting easy. ECOTOUCH Tankless Water Heaters undergo rigorous tests to ensure 100% safety. Read Review

The demand for water in homes is increasing day by day. The growing population, new appliances, and growing standards of living have resulted in an increase in demand for water. If you are looking to provide a sufficient amount of water to your home as well as reduce pressure on your main supply lines, then a tankless water heater may be just what you need.

There are many reasons to install a tankless water heater in your home. The first is that they are much more energy-efficient than traditional tank-based water heaters. They also keep maintenance simple, as you don’t have to clean and change filters or empty the tank and refill it regularly.

With a large home, choosing the right type of tankless water heater can be difficult, especially if you have specific needs that other models aren’t ideal for. In this article, we'll explain some of the pros and cons of different tankless water heaters so you can decide which is right for your home.

After nearly 13 hours of research, we were able to come up with many top products from prominent brands like Rinnai, Stiebel eltron, Ecosmart, Fogatti, Ecotouch, Thermomate, Rheem, Camplux enjoy outdoor life, Ez tankless, Black+decker. Among them, We think the best tankless water heater for large homes is Rinnai RLX94iN Tankless Water Heater. This Tankless Water Heater comes with a space-saving design and a high-performance 9.8 GPM hot water flow rate to provide constant, powerful water flow. It's easy to install in your home without the need for a plumber, and its compact size means it won't take up too much room. Alternatively, if you're simply looking for another option, you may go with Stiebel Eltron Tankless Heater.

Our article today focuses mainly on giving you guidelines and tips to be able to buy the right product that best suits your needs. Explore with us right here.

Our Top Picks

TOP Choice #1 Rinnai RLX94iN Tankless Water Heater
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Guaranteed to Last: 12-, 5-, and 1-year residential and 5-, 5-, and 1-year commercial factory warranty for heat exchanger, parts, and labor respectively

Endless Hot Water: Enjoy unlimited hot water flow throughout the house; compact, durable, and easy to install; professional installation recommended

Optimal Water Pressure: High-performance 9.8 GPM hot water flow rate for a powerful, constant stream

Energy and Space Efficient: Space-saving design conserves energy as it heats only when necessary

Instant Heating: Equipped with Circ-Logic - Pair with an external pump to reduce wait time for hot water via scheduled or on-demand recirculation

TOP Choice #2 Stiebel Eltron Tankless Heater
Our Score:
Stiebel Eltron

On-demand, continuous and unlimited supply of hot water

Sleek design saves space and no venting required

7 Years leakage and 3 years parts complete warranty

Copper sheathed heating element housed in copper cylinder

Electronic switch activated for virtually silent operation. Phase- single 60 Hz. Voltage- 208 V. Wattage- 27 kW

TOP Choice #3 Ecosmart ECO  Tankless Water Heater
Our Score:

ECOSMART tankless water heaters are 99.8-percent energy efficient

Manufactured in United States

150 A

Sleek and compact design with digital output temperature display

Required Breaker:4 x 40 A

Pipe Fittings:3/4 inch NPT

4 FOGATTI  Tankless Water Heater
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170,000 BTU high heating capacity and maximum 7.5 GPM. It is suitable for 3-4 outlet points, which can satisfy whole family. UEF over 0.82, the high energy conversion rate can effectively reduce energy loss.

The tankless design means you don't have to wait 30 minutes for preheating and unlimited use of hot water.

Using built in forced exhaust fan at the bottom ensures stable combustion and eliminates the influence of external wind. Compact design for easy installation.

We recommend that all installations of units must be done in accordance with the local building and plumbing codes of the installation location and installation be done by a licensed professional.

Excellent quality CSA certified in the United States and Canada. Adopting the world's most advanced technology, superior safety and durability.

Fogatti provide free replacement within 30 days, and 5 years warranty on heat exchanger and 2 years warranty on other parts. The above-mentioned labor costs extra from 31 days.

5 ECOTOUCH  Tankless Water Heater
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【INSTANT & SUFFICIENT HOT WATER】Applied with 5.5KW heating system, the electric water heater supplies instant, consistent and endless hot water of 116℉or higher temp shortly, no waiting for preheat nor terrible temp up & down, perfect companion for sinks. Time to get rid of those "lukewarm" toys.

【POINT of USE】The sleek tankless water heater is compact as an oatmeal box, making it possible to install anywhere close to outlet and avoid energy waste. It can be mounted horizontally, vertically, obliquely, ideal for kitchen, bar, school, hospital, community and hair salon. Please verify it is the right size for you: 5.5kW@240V; dimensions 11" x 7.5" x 2.35"; pipes fittings :1/2" NPT.

【CONVENIENT USE】The tankless water heater comes with digital display & touch control panel so temp setting is easy job. Now turn on the tap and let the smart unit do the rest, you needn’t go through hard lesson about temp setting by a mixer tap without any hint. The Black model comes with Remote control, useful for installation under sink.

【SMART SELF ADJUSTMENT】The hot water heater adjusts power input based on flow rate and temp setting in real time. For example, less power will be applied by the system when waterflow reduced, thus you still get ideal temperature instead of scalding hot water, which means comfortable experience. Optimal energy efficiency of 98% saves considerable electric charge.

【SAFE and DURABLE】Applied with multiple protection devices, every piece goes through strict tests to ensure 100% safe. Inner water and electricity lines are designed to run separately so as to avoid leakage or harm of scale build up. Approval by ETL and qualifies for UL, you can expect outstanding performance for years to come.

6 Rinnai V65iP Tankless Water Heater
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Never Run Out of Hot Water with this Compact Propane Water Heater: Non-condensing tankless hot water heater from Rinnai is only the size of a small suitcase and fits in a wide variety of spaces, but provides up to 6.5 GPM (5 fixtures at once)

Professional Installation Recommended: Visit the Find a Rinnai PRO page on our website to locate a qualified technician in your area to install your tankless water heater; We do not recommend installing a water heater without a technician

Original Design: Tankless hot water heater only heats when necessary to conserve energy; For the latest in non-condensing technology and a cleaner layout that speeds up service and installation, check out our new RE160iP model

Find Your Rinnai: See our product guides, manuals, energy guide, warranty information, videos, and tables to find the right tankless water heater for your home; Check our Ground Water Temperature Map to see if this heater is optimal for your region

Smart, Durable Design: Enhanced scale detection helps prevent serious, long-term damage to unit; Includes 15-, 5-, and 1-year residential guarantee for heat exchanger, labor, and parts, respectively; See Controlr module for WiFi control (not included)

7 Thermomate Tankless Water Heater
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[Stable Water Temperature] - Auto adjusting energy consumption basing on income water temperature and flow, ensuring maximum efficiency, continuous stable temperature and optimal power usage. Digital temperature display allowing adjustment in 1° increment from 80°F to 140°F. Heating element separated from water tube significantly reducing scale, corrosion and mineral buildup on the element, achieving better performance and low maintenance.

[Easy Installation & Safety Protection] - ETL certified with overheating protection, auto stop heating when detecting no water, quality workmanship for leakage protection

[Instant Unlimited Hot Water] - REQUIRE 3 SET x Double-pole 40AMP Breakers to Achieve 240V for this On demand tankless electric water heater, providing hot water in 3 seconds when you need it and as long as you need, eliminating wait time, never run out of hot water again and No More cold shower. Flow Rate 5.27GPM @35°F Rise

NOTE - Make sure this water heater is the correct size for your hot water need: 27kW at 240V draw max 114Amp; Required breaker 3 x Double-POLE 40AMP; Wire gauge 3 x 8AWG; Unit size 17.12" x 13.12" x 3.12"; Water connection 3/4" NPT. 2-year limite warranty and 24/7 customer support services.

[Self-modulating Power] - Self-modulating technology regulating the amount of energy required to heat water only when you need it with 99.8% efficient, saving up to 60% on water heating cost comparing to traditional tank water heater. Wall mounted compact size with no water tank, convenient for any spaces, saving floor space and fitting into tight spaces.

8 Rheem RTEX-24 Tankless Water Heater
Our Score:

24kW Model Flow Rate: up to 5.9 GPM for RTEX-24

Bottom 3/4" NPT water connections

Self-modulating power control

ON/OFF Dial Control with adjustable digital temperature display

On demand, consistent and continuous hot water

9 CAMPLUX Tankless Water Heater
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Indoor Installation. This natural gas tankless water heater is applied for home use, suitale for 1 shower and 1 dishwasher or 1 landury room.

6-In-1 Protection Ensures Safety. Dry combustion,flame failure device, anti-freezing protection, over heating protection to ensure your safety. Fully automatic temperature controls with an energy saving mode and child lock technology.

Optimal Features.Tankless hot water heater comes with oxgen-free copper heat exchanger and v-type stainless steel burner,high heating efficiency up to 89.98 %; 90°wind isolation design, this tankless natural gas water heater can anti backflow wind in high floors.

2.64 GPM Instant Water Heater. Camplux water heater delivers 2.64 GPM hot water.You can enjoy unlimited hot water flow throughout the house, compact, durable, and easy to install, professional installation recommended.

Easy to Install. The tankless water heater uses standard 1/2" BSP water fitting and gas inlet. The water heater comes with1/2 " BSP female to 1/2" NPT male gas connector adapter then you want hook this water heater to natural gas pipe directly.

10 EZ Ultra Tankless Water Heater
Our Score:
EZ Tankless

Condensing Technology - The EZ Ultra HE uses exhaust gas to preheat incoming water for added efficiency.

Back-draft prevention device and stainless steel horizontal vent pipe are included.


This heater can be vented horizontally or vertically using 2" Solid Core Schedule 40 PVC/CPVC

Capacity Up to 3.4 GPM @ 45F Rise In Ambient Temperature

Product Images, Product Titles, Product Highlights from Amazon Product Advertising API

What to Look For in a best tankless water heater for large homes?

Actually, when you decide to invest in best tankless water heater for large homes for yourself, lots of things to consider! It's harder to choose since the product comes with many types, functions, and features from different manufacturers. That’s why you should find a reliable space to acquire knowledge related to the item. 

We’ve highlighted the essential features of the best tankless water heater for large homes below. Along with checking out the list of best models in the list, you should also carefully read the buying guide here:

Venting Needs

Electric water heaters do not require venting, so they can be placed in any place in your home. When they heat up, gas hot water heaters emit carbon monoxide and other harmful gases. These heaters use a ventilation system made up of pipes and conduits that removes these byproducts. Gas heaters require venting, take up more space, and are less suitable for homes than electric water heaters.


A lowboy, or shorter water heater might be the best option if you don't have a lot to heat. They are smaller than average and can be used in small homes. You could also consider mini-tank or tankless water heaters. Although gas water heaters are bulky and heavy, it's possible to get smaller models. The size of electric water heaters is generally smaller. If you have limited space, tankless electric water heaters will be the most suitable option.

Tank Capacity

You should make sure your tank heater has enough hot water storage to provide heat for your entire family. Although tank heaters are capable of heating water at multiple locations simultaneously, they will require more time to heat the water. This could lead to unexpectedly cold showers.

Tankless Or Tank

A tank water heater stores a set amount of hot water and is ready to be sent to several appliances simultaneously. The tankless heaters heat the water quickly and require less space than water heaters with tanks. One unit might not heat enough water for multiple fixtures simultaneously, so it is possible to purchase multiple water heaters.

Efficiency Rating

Efficiency ratings are a measure of how efficient water heaters actually heat water. An efficiency rating of.70 for hot water heaters means that 70% of energy used by them heat water.
The difference between electricity and gas rates means that this rating doesn't give a good indication of the cost you could expect to pay for the unit. A gas heater with a lower efficiency rating will be more efficient than one that uses electricity. However, gas heaters are mucher than electric ones.
Because they don't have to run constantly to heat water, tankless heaters are significantlyer than storage tanks heaters. A tankless water heater can cut down on your energy bills by up to 40% depending on how much hot water you use. To determine the impact on your budget, it is better to calculate the annual operating cost for the hot water heater.

Brass Vs. Plastic Drain Valves

A tank water heater has a drain valve located at the bottom that allows for the proper drainage of the tank. The valves can be used with standard garden hoses and made from brass or polyvinyl chloride (PVC). A brass drain valve is better than using plastic for hot water heaters, as brass is more resilient than plastic.

Digital Displays

Modern water heaters have digital controls, which allow homeowners to set up the heater to turn off when they are away from home. Although a digital display can increase the initial price of the heater, it also increases the heat efficiency, which ultimately saves money.

Anti-Scale Devices

Some companies advertise that they can reduce mineral scale buildup by swirling water. Although scale may reduce the heater's life expectancy, it doesn't mean you have to spend a lot on fancy options. Look for one that comes with a 122023 warranty. This usually includes an element of a greater or lesser thickness.

Gas Or Electric

There are many factors that influence the choice of electric or gas-powered water heaters. These include local utility costs and personal preferences. People who want to save money upfront and those who don't have natural gas in their homes prefer electric water heaters. Gas heaters can be more costly upfront, but they will save you many hundreds of dollars per year depending on the energy cost in your region.


What size tankless water heater do I need to accommodate a large home?

The size of tankless water heater you need to accommodate a large home depends on several factors, including the number of bathrooms and the total water flow rate required. For example, a large home with four bathrooms may require a tankless water heater with a capacity of at least 6.6 gallons per minute. For best results, it is recommended to have a professional plumber assess your home and determine the most suitable size.

What is the difference between tankless water heaters and traditional tank water heaters?

Tankless water heaters are more energy efficient than traditional tank water heaters because they only heat water as it is needed, rather than storing hot water in a tank. This results in energy savings since the tankless water heater does not need to work as hard to heat the water. In addition, tankless water heaters are usually more compact and can be installed in tighter spaces than traditional tank water heaters.

Are there any maintenance requirements for tankless water heaters?

Yes, tankless water heaters require regular maintenance to ensure they are operating efficiently and safely. This includes flushing out the system to remove any sediment buildup, checking the temperature and pressure relief valve, and checking the vent pipes for blockages. It is recommended to have a professional plumber perform routine maintenance and inspections on your tankless water heater.

What are the benefits of using a tankless water heater for a large home?

Tankless water heaters are highly efficient, as they only heat the water when it is needed, as opposed to traditional tank-style heaters that are constantly heating water. This means that tankless water heaters require less energy to operate and have lower operating costs than traditional heaters. Additionally, tankless water heaters have a much longer lifespan than traditional heaters, providing hot water for up to 20 years.

After knowing the suitable kinds of best tankless water heater for large homes and the features you wish, it’s high time for you to start your shopping. Note that you shouldn’t run out to a particular store or start scrolling through online sales just yet. With the development of technology, especially the expansion of sale sites, you can easily find your buddy. 

Remember to check out our site weekly round-up to ensure that the current sales on best tankless water heater for large homes perform well in our tests. So you can catch up with them as soon as possible. Would you please give us your feedback for better service? Many thanks!

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About Mark Bailey

Mark Bailey
Mark Bailey is a freelance writer with a particular interest in home improvement, home design and gadgets. He has written for a number of online publications and enjoys sharing his passion for all things DIY with others. When he's not writing, Mark can usually be found elbow-deep in a home renovation project or spending time with his wife and two young children.

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