The Best Tankless Water Heater For Large Family In 2023

Mark Bailey By, Mark Bailey
Rinnai V94iN  Water Heater
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1. Best Of The Best: Rinnai V94iN Water Heater

With its smart, durable design, this non-condensing tankless water heater is only the size of a small suitcase and fits in a wide variety of spaces, making it easy to install in any home. Its advanced scale detection helps prevent serious, long-term damage to the unit, giving you peace of mind that your hot water needs will be met safely and reliably. Read Review

2. Best Bang For The Buck: FOGATTI Tankless Water Heater

Featuring a high energy conversion rate, advanced technology, superior safety, and durability, this tankless water heater is the perfect addition to any home. Its built-in forced exhaust fan helps ensure safe and stable combustion and eliminates any external wind influence. Its compact design makes for easy installation. E Read Review

3. Best Quality: Ecosmart Water Heater

With its digital output temperature display, you can easily adjust the temperature of your hot water. The ECOSMART tankless water heater is designed to be 99.8-percent energy efficient, making it an eco-friendly choice for your home. It also features a self-modulating technology, which provides you with an unlimited supply of hot water on demand. Read Review

4. Best Performance: Noritz Water Heater

Featuring an advanced heat exchanger design and built-in controller, it provides up to 6.5 gallons per minute of hot water. Various adapters and terminations allow for a wide array of venting options to best fit your particular setup. The sleek design and quality construction of this water heater make it an excellent choice for any home. Read Review

5. Best Efficient: CAMPLUX Water Heater

With its oxgen-free copper heat exchanger, v-type stainless steel burner, and wind isolation design, this tankless natural gas water heater is perfect for high-floor living. It features a high heating efficiency of up to 89.98%, a fully automatic temperature control, and an energy saving mode with child lock technology. Read Review

A tankless water heater is a great option for those with large families or many living in their homes. A tankless water heater means you don’t have to worry about maintaining a consistent supply of hot water from your tankless water heater. However, these water heaters aren’t right for everyone, and it depends on the size of your family, how many people live in your home, and other factors.

If you have the room and space for an entire tankless water heater, that will always be a better option than one of the smaller models. However, if you don’t have much space and need more hot water than a smaller tankless can provide, then an under-sink model may be perfect for you.

 If you’re looking to install one for the first time or as a replacement for an existing one, keep reading this article so that you know what to look out for. You will discover everything from the pros and cons of installing a tankless water heater and details about some of the best models available today.

After nearly 20 hours of research, We think the best tankless water heater for large family is Rinnai V94iN Water Heater. It is designed with enhanced scale detection that helps to prevent long-term damage to the unit, making it a smart and durable choice. Or you can check the FOGATTI Tankless Water Heater as the other great option, even if the first option didn't meet your requirements.

Our Top Picks

TOP Choice #1 Rinnai V94iN  Water Heater
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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)

Never Run Out of Hot Water with this Compact Tankless Gas 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 9.8 GPM (6 fixtures at once)

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 RE199iN 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

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

TOP Choice #2 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.

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

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.

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

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

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.

TOP Choice #3 Ecosmart  Water Heater
Our Score:

ECOSMART tankless water heaters are 99.8-percent energy efficient

Manufactured in United States

150 A

Pipe Fittings:3/4 inch NPT

Sleek and compact design with digital output temperature display

Required Breaker:4 x 40 A

4 Noritz Water Heater
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Remote thermostat & 6' power cord included

Endless hot water

Low Nox

High Efficiency

Can be vented with Schedule 40 PVC Pipe and Fitting

5 CAMPLUX  Water Heater
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Outstanding Features- The Camplux 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, the S/S 2.36 ” vent pipe exhaust harmful gases quickly.

6-In-1 Protection Ensure Your 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.

3.18 GPM Instant Constant Water Heater -Camplux 3.18 GPM tankless water heater natural gas delivers 3.18 gallons per minute of on-demand endless hot water ensures constant comfortable instant hot water for 2-3 persons whole house. 3.18-GPM heater is activated by water flow rather than water pressure; Minimum activation water capacity rate: 0.65 GPM-4.8 GPM; Maximum input rating: 82,000 BTUs; Water connection location/size: Bottom/0.5-inch NPT.

Note- The standby electric power of is 2W, working electric power is 42W. Natural gas input pressure is 0.25 psi. There is a pressure relief valve at the water inlet of water heater. It is necessary to manually unscrew the pressure relief valve to drain the water inside the machine in time after using the machine to avoid freezing and blew up when the temperature is lower than 32 ° F in winter .

Convenient, Easy Installation -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.It also comes with 2.3" horizontal vent pipe,ensures efficient power ventilation. You can take Camplux customized wall thimble-WT236 for perfect indoor use.

Modern Design,Easy Operation -Trendy and modern design with unique black glassy front panel,easy to control the water temperature with LED touchscreen (Fahrenheit and Celsius switch optional).The compact size instant water heater saves more space than traditional tanks.

6 Rinnai V53DeP Water Heater
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Enhanced scale detection lessens possibility of serious, long-term damage to unit

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

Optimal Water Pressure: High-performance up to 5.3 GPM hot water flow rate for a powerful, constant stream

Guaranteed to Last: 10-, 5-, and 1-year residential factory warranty for heat exchanger, labor, and parts, respectively

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

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

180,000 BTU high heating capacity and maximum 8.1 GPM. It is suitable for 3-5 outlet points, which can satisfy whole family. UEF over 0.82, the high energy conversion rate can effectively reduce energy loss.

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

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.

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

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.

8 Tengchang Water Heater
Our Score:

Gas Pressure: 2000Pa Rated water pressure: 0.02-0.8Mpa Gas pipe: G 1/2'' Water Inlet: G1/2'' Water Outlet: G1/2''

This electric water heater features instant heating, tankless and constant temperature control. With protection against dry heating and over-temperature protection. It is safe, energy-saving and long lifespan, providing you and your families more comfortable bathing experience.

Rated Voltage: AC 110V / 60Hz Rated Heat Input Power: 32kW Rated Hot Water Output: 16L/min Electrical Rating: 36W

Waterproof rating: IPX4 Support thermostat: Yes Style: Vertical

Material: Plastic + Metal Exhaust temperature:Maximum 392°F Heating Material: nickel-chromium alloy liner

9 Runnatal Tankless Water Heater
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Note: Please download and read the installation manual and product manual carefully when purchasing the product to ensure that your installation environment is consistent with this product. When installing, please strictly follow the installation manual and installation instruction video, otherwise it may not work. If you have any questions about the product, please contact us by email. We have a professional technical support team.

【Energy and Money Saving】The hot water heater adjusts power input based on flow rate and temp setting in real time. Summer/winter 2 modes to save up to 60% on your propane gas costs.

NOTE: This product does not have a serial number. If you don't know how to install a water heater at all, it is recommended not to buy it.

【High Sensitive Touch Led Display】Comes with smart digital LED display high-definition large screen, freely adjustable the temperature between 30℃-65℃.

【Multiple Security Protection】The propane gas water heater is upgraded with 12 protection methods to ensure your safety. Such as dry burning protection, over 65℃(149 °F) protection, leakage protection, etc.Note: In cold weather, if the water heater is not used for a long time, it is necessary to open the pressure relief valve to drain the residual water in the water heater to prevent the exchanger or water pipe from freezing and swelling.

【Quality Material】Made with brushed stainless steel material, the propane gas water heater has the function of high temperature resistance, corrosion resistance. Built-in oxygen-free copper water tank, long service time.

【Tankless Instant Hot Water Heater】No need to preheat before using the tankless water heater. As soon as you turn on the tap, the water flows with your desired temperature.

10 TCFUNDY Water Heater
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【16L Tankless Water Heater】TCFUNDY Tankless water heater with compact design saves more space and energy efficient than traditional water heaters. LCE screen with digital temperature display and touch screen control. There are 3 modes you can choose: eco mode, common mode, tub mode.

【Safety of Use】Premium Oxygen-Free Copper Heat Exchanger to ensure long lifespan, automatic power-off when water is off and over-temperature protection, flame-out protection, anti-freezing protection(manual drainage needed via water relief valve), air flow pressure switch protection to ensure the safety.

【On-Demand Instant Water Heater】High efficiency natural Gas tankless water heater delivers 4.23 gallons per minute of on-demand endless hot water. No more waiting for long time, instant hot water for families, homes, cabins or apartments.

【Easy Installation】Comes with 18.9“x2.36" horizontal vent pipe to ensure efficient power ventilation, with showerhead. Minimum activation rate: 0.66 GPM. Min. water pressure: 2.9 PSI, low water pressure to start, users of higher floors can enjoy pleasant experience of shower.

【Thermostatic & Energy Saving】Water heater built-in high-precision thermostat ensures constant temperature, high-thermal efficiency up to 90%. The self-modulating temperature technology only heat up water while you are using it to save energy.

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

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

The best tankless water heater for large family is the standard appliance in your life. Seeing that the item is introduced with many models with distinct functions and features, several challenges in selecting. However, anything has its solution, not except for that. We, the high-qualified expert in this area, will be available here to give you support.

Of course, looking for the best tankless water heater for large family which suits you most requires many criteria to consider. You are projected to think carefully about each of the features below so that your choice will be appropriate:

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.

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.


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.

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.

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.

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.

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.

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.


What size tankless water heater do I need for a large family?

The size of the tankless water heater you will need depends on the number of people in your family and the amount of hot water they use. Generally, a tankless water heater with a capacity of at least 4-6 gallons per minute (GPM) is recommended for large families. Additionally, it is important to consider the flow rate of your incoming water source when calculating the size of the unit you need. If your family uses a lot of hot water simultaneously, you may need a larger unit with a higher GPM rating.

How long does a tankless water heater last?

With proper maintenance, tankless water heaters can last up to 20 years, depending on the model and the environment. However, it is important to note that the life of your tankless water heater will be heavily dependent on the water quality in your area and how often you maintain it. It is recommended that you inspect your unit at least once a year and replace any parts that may be worn or damaged.

Are tankless water heaters energy efficient?

Yes, tankless water heaters can be more energy efficient than traditional tank water heaters. They only heat water when it is needed and do not have to maintain a tank full of hot water, which can help reduce energy costs. Additionally, many tankless models come with advanced features such as recirculating pumps, which can further reduce energy costs.

What is the best way to maintain a tankless water heater?

The best way to maintain a tankless water heater is to regularly check for any leaks and inspect the unit for any signs of damage or wear and tear. Additionally, it is important to flush the unit at least once a year to prevent any build-up of mineral deposits. Finally, it is recommended that you change the filter every 3-6 months to ensure the unit is running at its most efficient.

Look through again. The brand of product you choose will affect the options available to you. Moreover, pricer models will offer more customization options. We've covered top-scoring models varying at some price. So you have more choices to consider. Furthermore, our staff will update the info related to best tankless water heater for large family with the newest data. Let check our site more regularly to get the latest options.

If you want to take practical support from our expert, don't hesitate to give us feedback. Please feel free to contact us. Hopefully, with our buying guide, you can have a happy shopping for the product.

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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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