Best Tankless Water Heater For Large Family

Does your large family constantly fight over who gets the next hot shower? It’s a common problem, but there’s an efficient solution: tankless water heaters. This blog post will guide you through everything you need about these space-saving, high-capacity devices and help you find the best one for your household.

Keep reading; our top picks could save your family’s morning routine!

Factors to Consider for a Tankless Water Heater for Large Families

When choosing a tankless water heater for a large family, it is essential to consider factors such as flow rate and capacity, energy efficiency, and installation and space requirements.

Flow Rate and Capacity

Understanding flow rate and capacity is crucial when selecting the best tankless water heater for your large family. Flow rate, measured in gallons per minute (GPM), describes how much hot water a heater can provide at any given time.

A higher flow rate ensures that everyone in your family can access hot water, even if multiple appliances run simultaneously.

Tankless heaters with larger capacities supply more hot water to meet high demand. For instance, an Ecosmart ECO 27 can keep up with numerous showers and dishwashing or laundry needs without a hitch because of its sizable capacity.

Choosing a tankless water heater model that matches your household’s typical usage patterns is essential to avoid running out of hot water during peak times.

Energy Efficiency

Tankless water heaters are a boon when it comes to energy efficiency. The Ecosmart ECO 27, hailed as one of the best tankless water heaters for large families, is the epitome of this advantage.

With its easy-to-use controls and reduced energy consumption, homeowners can enjoy hot showers without worrying about skyrocketing utility bills.

In general, tankless water heaters outclass their traditional counterparts in terms of efficiency. They heat up water immediately on demand rather than storing pre-heated gallons, which tends to lose temperature over time.

This enhanced performance not only ensures an instant hot water supply but also puts a leash on wasted energy.

Moreover, gas-powered models like Rinnai Condensing Tankless Water Heater have Energy Star ratings indicating their adherence to eco-friendly standards. Such appliances keep the carbon footprint in check by minimizing greenhouse gas emissions while providing superior service to large households as they use less fuel to heat more water quickly and efficiently.

Installation and Space Requirements

Tankless water heaters fit perfectly, even in limited spaces. Compared to traditional tank-style heaters, they take up much less room because of their compact size. You can easily mount a gas tankless heater on a wall; it’s about the size of a suitcase.

They also prove safer than their counterparts since there’s no risk of gallons of water spilling if something goes wrong. Their installation process is straightforward and not as time-consuming.

The best tankless water heater for large families, such as the Ecosmart ECO 27, provides ample hot water capacity without taking up significant space. Moreover, brands like Stiebel Eltron offer more options that cater to various family sizes while ensuring efficiency and easy-to-use features.

Top Recommendations for Tankless Water Heaters for Large Families

Quick Recommendation

For a quick recommendation, check out our product list, or if you want more in-depth reviews, scroll down.

Comparison Table

Product Name Price Date First Available Customer Reviews Manufacturer Special Features
EcoSmart ECO 27 $459.00 February 18, 2010 4.4 out of 5 stars, 4,888 ratings Ecosmart LED Display
Rheem 18kw Tankless Electric Water Heater $385.51 January 19, 2017 4.4 out of 5 stars, 1,481 ratings Rheem LED Display
Stiebel Eltron DHC Trend Point-of-Use March 11, 2010 Stiebel Eltron
Rinnai Condensing Tankless Water Heater $2,244.11 May 4, 2018 4.2 out of 5 stars, 165 ratings Rinnai

1. EcoSmart ECO 27

(Images Credits: Amazon)

Endless hot water and energy savings for eco-conscious homeowners.


  • Lifetime warranty on electronics, exchanger, and element
  • LED display for easy monitoring and control
  • Compact rectangular shape for convenient wall mounting
  • Maximum temperature of 120 degrees Fahrenheit
  • The high flow rate of 6.6 gallons per minute
  • Energy-efficient with a maximum output of 27 kilowatts

The EcoSmart ECO 27 tankless water heater is a top-of-the-line solution for those who demand a constant hot water supply. Its stand-out feature is the digital temperature control that allows degree-by-degree adjustments, giving you absolute command over the hotness of your water.

This isn’t just about comfort; it’s about efficiency, too. With this level of control, you don’t waste energy heating unnecessary gallons of water to higher temperatures than what’s needed.

What makes EcoSmart ECO 27 a game changer in the world of electric heaters is its compact size and smart design. Measuring only 17 x 17 x 3.75 inches, it saves up to 12 cubic feet in storage space compared to traditional tank heaters – making it an optimal choice for homes short on space.

Do not let its diminutiveness fool you, though; this little wizard can provide between 2.7 and 6.5 gallons per minute depending on inlet water temperature – plentiful enough for most large households.

Perhaps one of the most attractive selling points about EcoSmart ECO 27 Tankless Water Heater is how much money you could save with it long-term: not only does it only heat up when told to do so (which means no more expensive standby losses), but also EcoSmart claims that their product can cut down your existing costs by up to half! That makes this a super economical choice despite its slightly premium upfront cost.

Our confidence in selecting the EcoSmart ECO as our No.1 pick stems from high customer satisfaction ratings and positive feedback regarding performance and longevity — all while keeping functionality at heart without compromising sleek design or capacity requirements.

The manufacturer provides a limited lifetime warranty on electronics, exchangers, and elements and certifications from UL-499 and ETL list – providing peace of mind alongside consistent hot showers whenever desired.


  • Complete control of hot water temperature in 1-degree increments
  • Saves up to 12 cubic feet of storage space
  • Never runs out of hot water
  • 99% thermal energy efficient, saving up to 50% in water heating costs


  • Requires a 200 Amp electrical panel, which may require additional electrical upgrades
  • It may not be suitable for larger homes or households with high hot water demand
  • Installation and maintenance may require professional assistance

This product is perfect for the eco-friendly homeowner looking to save money on energy bills while getting a reliable, consistent source of hot water. The EcoSmart ECO 27 Tankless Water Heater provides on-demand hot water in an efficient and compact design – switch away from tank heating today and start saving!

Product Info


Price: $459.00

2. Rheem 18kw Tankless Electric Water Heater

(Images Credits: Amazon)

Instant hot water with precise temperature control and easy installation.


  • 18000 wattage for powerful heating performance
  • Compact size at 18.5 x 14.5 x 3.5 inches, suitable for various spaces
  • LED display for easy monitoring and control
  • Stainless steel finish for durability and a modern look
  • The wall mount installation method saves space
  • Energy-efficient with a water consumption of 7 gallons

The Rheem 18kW Tankless Electric Water Heater is a reliable choice for households seeking an efficient way to heat their water. This tankless heater stands out with its advanced self-modulation, adjusting power as needed to meet hot water demand and thus contributing to significant energy savings.

The ease of installation is another bonus – it features bottom 3/4 inch NPT water connections, making the replacement process simple. Notably, the heater has durable Copper immersion dual heating elements, which are field serviceable, providing peace of mind that if something does go wrong, you have the option of repair rather than immediate replacement.

This model is more user-friendly than some rivals because of its external digital thermostatic control plus LED display offering +/-1 degree accuracy. You can set your preferred temperature; rest assured that’s what you’ll get! There will be no more diabolical showers where you oscillate between being too cold or scorched.

We’ve positioned the Rheem 18kW 240V Tankless Electric Water Heater at No.2 in our list because of its superior functionality and high flow rate — up to a whopping 4.4 GPM (gallons per minute). It means faster delivery times for hot water around your property compared to many other models on the market.

In summary, this Rheem electric water heater offers advanced technology in an easy-to-use interface; its reassuring durability and impressive power efficiency make it an excellent investment for any homeowner looking to upgrade their hot water system.


  • Easy installation with threaded connections
  • Efficient heating with durable copper immersion heating elements
  • Adjustable power to meet hot water demand, saving energy and cost
  • Accurate temperature control for a comfortable bathing experience


  • The limited flow rate of up to 4.4 GPM may not be sufficient for households with high hot water demand.
  • Requires a dedicated 240V electrical circuit, which may require professional installation or upgrading of the existing electrical system.
  • The lack of a built-in recirculation pump means it may take longer for hot water to reach faucets and showers far from the unit.

The Rheem 18kw Tankless Electric Water Heater is perfect for anyone looking for reliable and efficient hot water on demand. With its simple installation, digital temperature display, and meticulous accuracy, this product is designed to save time, money, and effort.

So, if you need a powerful tankless electric water heater that won’t disappoint, look no further than the Rheem 18kW Tankless Electric Water Heater!

Product Info


Price: $385.51

3. Stiebel Eltron DHC Trend Point-of-Use

(Images Credits: Amazon)

Instant hot water supply without taking up much space.


  • Compact design: The Stiebel Eltron DHC Trend Point-of-Use water heater is designed to be compact and easily installed in small spaces.
  • Instant hot water: This product provides instant hot water whenever you need it, eliminating the need for a tank and reducing energy waste.
  • Energy efficient: The DHC Trend is highly energy-efficient, helping you save on utility bills while minimizing environmental impact.
  • Temperature control: With its temperature control feature, you can precisely and accurately set the desired temperature for your hot water output.
  • Durability: Manufactured by Stiebel Eltron, a trusted brand in heating technology, this product is built to last and withstand everyday use.
  • Versatile installation options: Whether mounted horizontally or vertically, the DHC Trend can be installed in various locations to suit your needs.

The Stiebel Eltron DHC-E 8/10 Point of Use Tankless Electric Water Heater is a revolution in water heating technology. This compact unit uses three separate heating elements engaged in stages, ensuring optimal efficiency and consistent water temperature at all times.

The proprietary microprocessor control system takes readings from two temperature sensors and one flow sensor to ensure precise control over the water-heating process.

This tankless electric water heater stands out due to its innovative design and advanced features, making it a valuable addition to any home. Its point-of-use configuration means hot water is delivered immediately when needed without wasting energy on stored, unused hot water – this translates directly into savings on your energy bill.

Moreover, the size of this unit adds versatility as it can be installed anywhere in the house due to its small yet robust design.

Why did we rank this as number 3 on our list?

While many tankless heaters are available today, few strike such an impressive balance between performance, ease of use, affordability, and energy efficiency as the Stiebel Eltron DHC-E 8/10 Point of Use Tankless Electric Water Heater does.

It provides splendid service for both single-point and multi-point applications while extending longevity with less wear and tear compared to conventional models.

To sum up, When considering choice factors like durability, cost-effectiveness, installation ease, and overall user experience—the Stiebel Eltron DHC-E trends strongly across all parameters. A wise investment for those seeking convenience combined with cutting-edge technology wrapped up in a compact package.


  • Instant hot water on demand for specific locations in your home
  • Compact design allows for easy installation and saves valuable space
  • Energy-efficient operation helps save on utility bills
  • Advanced technology ensures a constant supply of hot water without the risk of running out


  • Limited hot water supply compared to larger tankless models
  • It can be expensive to purchase and install
  • It may require a dedicated electrical circuit for proper operation

This product is ideal for anyone saving space, time, and money on hot water. The Stiebel Eltron DHC-E 8/10 Point of Use Tankless Electric Water Heater takes up minimal space while providing an instant and continuous hot water supply with no wait or waste. Contact us today to learn how you can benefit from this outstanding product!

Product Info



4. Rinnai Condensing Tankless Water Heater

(Images Credits: Amazon)

Efficient, Space-saving Tankless Water Heater with Instant Hot Water


  • Compact design with a depth of 12.0 inches for easy installation in tight spaces.
  • Operates on 120 volts for convenient power compatibility.
  • The sleek silver color adds a modern touch to any space.
  • Durable construction from the trusted brand Rinnai.
  • Generates hot water at 11 gallons per minute for continuous use.
  • Wall-mounted installation method saves floor space and provides flexibility.

Rinnai’s RUR199eN tankless water heater is a real game-changer in home appliances. Packed with innovative features, it offers immediate hot water on demand and delivers up to 11 gallons per minute (GPM) for consistent, uninterrupted stream service.

Engineered excellently for outdoor installation, this natural gas-powered unit brings efficiency and functionality right at your fingertips.

The standout feature of this condensing tankless water heater is its advanced ThermaCirc360 technology that ensures faster hot water delivery by integrating a recirculation pump, timer, and thermal bypass valve.

This makes it an ideal choice for homes without a dedicated return line. It also considerably reduces wait time for warm water, leading to less wasted water, which means more savings over time.

One area where the Rinnai Condensing Water Heater truly shines is energy efficiency thanks to its smart design that heats only when necessary, helping you save significantly on utility bills.

Unlike conventional bulky units crowding your space, this product flaunts a compact profile, enhancing aesthetics while freeing up valuable space in your home.

Moreover, with industry-leading warranties attached—15 years on the heat exchanger, 5 years on parts, and one year of labor–the longevity of the Rinnai RUR199eN isn’t merely promised; it’s guaranteed! Plus point? Its WiFi monitoring feature takes user convenience even further by allowing remote management from anywhere, anytime, through smartphone connectivity.


  • Guaranteed to Last: The Rinnai Condensing Tankless Water Heater comes with a 15-year guarantee for the heat exchanger, ensuring long-lasting performance and reliability.
  • Instant Heating: With ThermaCirc360 technology, this water heater provides faster hot water by recirculating it within the system, perfect for homes without a dedicated return line.
  • Optimal Water Pressure: This tankless water heater offers an impressive flow rate of up to 11 gallons per minute, ensuring a robust and constant stream of hot water.
  • Energy and Space Efficient: The space-saving design of this unit conserves energy as it only heats water when necessary, helping to reduce utility bills.


  • Discontinued model, which may make it difficult to find replacement parts or support.
  • It may not be suitable for homes without an existing return line, as the ThermaCirc360 technology relies on a dedicated return line.
  • Wi-Fi monitoring may require additional setup and configuration.

This high-tech Rinnai Condensing Tankless Water Heater is perfect for the modern homeowner who values efficiency and convenience.

Save energy, time, and space with this sleek and powerful product – ideal for medium to large households looking to reduce their water heating costs. Buy now to upgrade your home today!

Product Info


Price: $2,244.11


Opting for the right tankless water heater can make a huge difference in your home, especially for large families. The EcoSmart ECO 27 is an excellent pick with its high efficiency and maximum output of 27 kilowatts.

On the other hand, Rheem’s 18kw Tankless Electric Water Heater offers powerful performance and compact design. So, don’t hesitate – improve your family’s comfort today with these top-notch tankless water heaters!


1. What makes a tankless water heater the best for a large family?

The best tankless water heater for a large family offers continuous hot water flow energy efficiency and can serve multiple outlets simultaneously.

2. How does the tankless water heater work?

A tankless water heater heats up cold water instantaneously as it passes through its heating element, eliminating the need for storage tanks.

3. Are there specific brands known as the best tankless heaters for big families?

Several brands are known to provide efficient and reliable options, but what’s ‘best’ could vary based on your household’s specific needs, like size, usage patterns, etc.

4. Is installing the Best Tankless Water Heater For a Large Family expensive?

Installation costs may vary depending on factors like model complexity and home infrastructure. However, these units save money in long run due to their high energy efficiency.