10 Best Tankless Water Heater for Large Family

A tankless water heater is a great investment for your home if you don’t want a large tank or don’t have space for. But deciding which one to buy can be a hard choice. I’ve reviewed a bunch of tankless water heaters and here is what I’ve found out. 

The best tankless water heater for large families is the Stiebel Eltron Tempra 29. It is an affordable and easy to install water heater and can last a very long time!

Best tankless water heater – Stiebel Eltron 239223

The best tankless water heater is the Stiebel Eltrong 239223. It is a great water heater for many reasons. One reason why i like it is because it uses about 15 to 20% less energy than conventional electric water heaters. 

These tankless water heaters do not just store hot water, waiting for the user to use it.They operate on-demand to provide continuous and endless hot water when the user needs it, and not waste energy when they do not.

The installation process is also easy enough that anyone without much experience with water heaters can install it.

If you want to learn more about water heaters, here is an article I wrote about water heaters. I encourage you to read it!

Features and Capabilities

This tankless water heater features exclusive advanced flow control.

The heater uses German patented technology to automatically maintain water temperature for constant comfort.

The heater can reduce water flow slightly if hot water demand exceeds the capacity, in order to make sure that hot showers will not be interrupted.

  • This heater offers accurate temperature delivery and maximum efficiency factor.

  • Very light in weight.

  • This product has California’s Proposition 65 on it.

Another great option – Noritz NRC66DVNG 

Another great option for a tankless water heater is the Noritz NRC66DVNG. 

The NORITZ NRC66DV is a complete condensing tankless water heater with an advanced heat exchanger system and a built-in controller. It has a maximum flow rate of 6.5 gallons per minute.

This heater can also be vented using a 3-inch schedule 40/80 PVC, PP, or CPVC.  It comes with various adapters and terminations to allow a wide array of venting options.

Features and Capabilities

The heater is highly recommended by plumbers. They have a flow rate of 6.6 GPM and are run by natural gas.

The dimensions for the heater are  6.7 x 13.8 x 23.6 inches. The heater weighs 11.42 pounds, which is lighter than some similar heaters. 

The water heater comes with an installation manual, user manual, and specification sheet.

  • It can be vented with Schedule 40 PVC Pipe and Fitting.

  • It also comes with a remote thermostat and a 6-foot power cord.

  • 12 years on heat exchanger, 5 years on parts, 1 year on labor warranty.

  • Costlier than other similar products.

Another great option – Rinnai Indoor Water Heater

The Rinnai V94IN is a compact model with a steel-made corrosion-resistant body. Every part of the heater is replaceable so you can easily swap the components.

The heater is energy friendly. The total unit of this heater weighs 46.3 pounds which may be heavier than other similar products.

See how i install flexible water heater connectors

Features and Capabilities

The Rinnai V94IN is a compact model and features maximum output in minimum space. The compact design means it can use less energy and conserve more water.

The heater provides a water supply with a flow rate up to 9.8 GPM, which is very suitable for a large family. The energy factor is 0.82 and the uniform energy factor is 0.81.

  • As the size is very small, you can install it anywhere.

  • This heater saves up to 40% of energy.

  • Way costlier than other similar products.

Fast pick – Rheem RTEX-18 18kW 240V

The Rheem tankless water heater provides a fast, continuous hot water supply that is on-demand for single point-of-use or multiple applications. It has a robust copper immersion heating element with a brass top which increases the durability of the product but also makes it easy to replace.

Features and Capabilities

This Rheem tankless water heater has a rating of 240 volts and 18k watts. This product is 99.8% energy efficient. It is made of steel with a shiny gray cover. It also has a digital temperature control that allows the user to set the temperature in increments of 1°.

  • The installation process is very easy.

  • It comes with an external digital thermostatic control with an LED display.

  • No warranty is given.

  • It may not be suitable for washing machines.

Ecomart ECO 36 36kw 240V Electric Tankless Water Heater (Best Value Electric)

The EcoSmart ECO comes with a patented self-modulating technology.

The heater is ideal for the northern United States, where incoming water temperatures can reach as low as 37 degrees

Features and Capabilities

This Ecosmart 36 is capable of heating nearly 3.5 gallons per minute if the water’s initial temperature is extremely low. It can handle up to two showers running at the same time and never run out of hot water.

For homes in the southern United States, the ECO 36 is perfect for large Roman-style and Jacuzzi tubs or high demand of hot water between multiple water lines.

It can handle up to 6 gallons per minute, which means you can run four showers and a sink simultaneously and never run out of hot water.

  • EcoSmart features the most advanced self-modulating technology.

  • The fast heating system saves a lot of time.

  • There are some small parts of this machine that can be hazardous to kids under 3 years.

EcoSmart ECO 27 Water Heater

EcoSmart ECO 27 is a 27-kilowatt tankless electric water heater ideal for providing hot water for apartments, condominiums, townhomes, hotels, and other whole-home applications. It can provide up to 6.5 gallons per minute considering the inlet water temperature.

Features and Capabilities

This Smart Technology electric tankless water heater is suitable for climates where the incoming water temperature can get very low.

The ECO 27 is capable of heating nearly 3 gallons per minute at this temperature. This model is well-suited for homes in the northern U.S., Canada, and other cold countries.

  • The on-demand heating system cuts down the time spent waiting for hot water.

  • The installation process is very easy.

  • It contains some small parts that may cause choking hazards for children under 3 years.

Good budget pick – EcoSmart ECO 11

The EcoSmart ECO 11 is a 13-kilowatt tankless electric water heater appropriate for providing hot water for a bathroom, small sink, and other point-of-use or low-flow applications.

It can provide between 1.3 and 3.1 gallons per minute depending on the inlet water temperature.

It requires a minimum 125 amp electrical panel for installation with a 60 amp double pole breaker connected to a set of #6 AWG wires.

READ: Why Is My Tankless Water Heater Not Working

Features and Capabilities

The digital Temperature Control of this heater allows the user to set the temperature in increments of 1 Degree.

This model is also suitable to use in colder climates as a point of use for a sink or other low flow application.

These tankless water heaters are sized based on flow rate and temperature rise, and there is a direct relationship between the two.

  • This product offers a lifetime warranty.

  • Saves up to 60% energy.

  • It has California’s Proposition 65 warning on it.

Solid option – Rinnai Outdoor

The Rinnai Outdoor Tankless Water Heater is a V53DeN model, which is the latest product of the company. This product runs by natural gas and has a flow rate of up to 5.3 Gallon per minute. Its compact design cuts CO2 emissions use less energy and conserve water.

Features and Capabilities

The Rinnai tankless water heater recirculates hot water through your pipes to get you hot water fast. The parts of this tankless water heater are replaceable, so you can easily swap a component if it shows any problems instead of buying a new machine. 

The average durability is 20 years which is a lot longer than normal water heaters.

  • The size is very small which saves space.

  • It uses 40% less energy than traditional tanks.

  • It offers no warranty.

  • Venting is required for this heater.

Eemax EEM24027 Water Heater

The Eemax EEM24027 is an electric tankless water heater. It has a 240 volt, 27-kilowatt unit, and is available in a blue color.

The heater weighs 13.75 pounds and the dimensions are 17 x 17 x 3.75 inches. It is a very efficient tankless water heater that can serve the water usage demand of a large family.

Features and Capabilities

The heater offers a continuous supply of hot water. It only heats the water you need and when you need it.

It features some of the most advanced and self-modulating technology. The heater adjusts how much energy it needs to use by determining how much hot water the user needs.

  • The parts are made with stainless steel. So no need to worry about rusting.

  • The product comes with a 5 years leak and 1 year parts warranty.

  • The size is compact which saves valuable storage space.

  • It takes some time to heat the water.

  • The water temperature does not stay constant.

Marey GA10LP Power 10L 3.1 GPM Propane Gas

The Marey water heater can handle up to 2.7 gallons of water flow per minute at 115°F temperature. The water heater also can be great to save energy. It will only heat water when water is needed. 

The heater is designed and manufactured in the USA.Its compact design saves space and is easy to install. The heater needs a 2-D cell battery for ignition and venting.

Features and Capabilities

This GA10LP compact model water heater saves space and allows easy installation anywhere in your home.

It heats an unlimited volume of water when the user demands it and also has the option to regulate the water flow and gas flow to a better temperature.

The 10L unit provides up to 3.1 Gallons per minute, to provide hot water for family homes at multiple points of use.

  • The price is considerably low. So this product is very affordable.

  • It saves up to 60% on electricity bills for water heating.

  • This heater needs venting.

  • It also needs batteries to operate which does not come with the product.

Why should you use a tankless water heater for your large family?

Best Tankless Water Heater for a Large Family

There are a number of benefits for switching to a tankless water heater. 

One major benefit of a tankless water heater is that it can save money. 

which you have to spend on keeping 40 to 50 gallons of water hot in a storage tank.

Statistics show that a tankless water heater uses about 30 to 50% less energy than a heater with a tank.

So, you get to save energy, and the cherry on top, there is an endless hot water supply! With a tankless water heater, you can even fill a bathtub or a whirlpool.

They are comparably more compact than a standard water heater and they can be mounted on a wall.

These heaters heat up water only when you turn on the faucet. So that saves a lot of energy for your home.

But there are some other factors to consider as well. For example, considering your geographical position, tankless water heaters may work better in southern regions than northern parts.


Having an endless supply of hot water sounds very convenient. But no matter how gallons of water get wasted while heating water in these heaters.

So please, don’t waste water unnecessarily. Save water and energy and get the best tankless water heater for your large family.

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