small tankless water heater

Best Small Tankless Water Heater: 5 Options

Warm water is a necessity in many homes – from providing hot water for showers to water for washing the dishes. In the past, the only options available were the cumbersome tank heaters, leaving those with small kitchens with no options. However, things have changed and now you can find small tankless water heater. Since there are plenty of options to choose from, it can be overwhelming to choose the right one, but we’re here to help.

After analyzing tens of brands, a few stood out. Read on to see our standout small tankless water heater options in 2024.

Compare Small Tankless Water Heaters

EcoSmart Tankless Water Heater ECO 11
  • Dimensions: 8"W x 11.5"H
  • Capacity: 2 Gallons
  • Wattage: 13000 watts
  • Stiebel Eltron Tankless Water Heater
  • Dimensions: 16.63"W x 14.5"H
  • Capacity:
  • Wattage: ‎18000 Watts
  • Rheem Tankless Water Heater RTEX-18
  • Dimensions: 14.5"W x 18.25"H
  • Capacity: 18 Gallons
  • Wattage: ‎18000 Watts
  • Bosch Electric Mini Tank Water Heater
  • Dimensions: 13.75"W x 13.75"H
  • Capacity: 2.5 Gallons
  • Wattage: ‎1440 Watts
  • Eemax Tankless Water Heater EEM24018
  • Dimensions: 14"W x 3.75"H
  • Capacity: 18 Gallons
  • Wattage: ‎18000 Watts

  • Our Recommendation on Buying Best Small Tankless Water Heater

    Determining the best tankless water heater for small spaces from your list depends on various factors such as energy efficiency, output, installation, and specific user needs. Here’s a summary of each option to help decide the top choice:

    1. EcoSmart ECO 11 Electric Tankless Water Heater: Renowned for its eco-friendly operation and compact size, the EcoSmart ECO 11 is a strong contender for those who prioritize energy savings and have a smaller hot water demand, suitable for a small apartment or a point-of-use solution.
    2. Stiebel Eltron Tankless Water Heater: Stiebel Eltron’s models are celebrated for their reliability and performance. They are a go-to for users who value long-term durability and are looking for a water heater from an established brand with a track record of quality.
    3. Rheem RTEX-18 Electric Tankless Water Heater: With its on-demand, continuous hot water and easy-to-adjust temperature controls, the Rheem RTEX-18 is ideal for medium-sized households needing efficient space usage and strong water output.
    4. Bosch Electric Mini-Tank Water Heater: Bosch’s mini-tank water heater offers immediate hot water with a simple installation process. It’s a good fit for those who need a quick solution without major changes to plumbing, great for under-the-sink applications.
    5. Eemax EEM24018 Tankless Water Heater: The Eemax model provides a balance between efficiency and high-capacity heating. It’s designed for durability and performance, making it suitable for larger households or those with higher hot water requirements.

    For small spaces and lower usage, the EcoSmart ECO 11 is very effective. For larger households or those with a higher demand for hot water, the Rheem RTEX-18 or Eemax EEM24018 might be the best choice. The Bosch Electric Mini-Tank is perfect for point-of-use and immediate hot water access.

    5 Best Small Tankless Water Heaters

    1. EcoSmart Tankless Water Heater ECO 11

    • Heats water consistently.
    • Saves on space.
    • It’s energy saving.
    • Provides between 1.3 to 3.1 GPM depending on the water temperature in the your pipes.
    • EcoSmart offers a lifetime warranty on this product.
    • Proven.
    • Requires some technical installation.
    • Has low GPM.

    EcoSmart brand is known to make unique appliances that has the touch of modern technology. The EcoSmart Tankless Water Heater comes in various sizes that provides a wide array of GPMs.

    In addition, it has an unlimited warranty thereby proving that the company has faith in this product. Therefore, you can rest assured that any repairs or replacement needed will be sorted. 

    The good thing about this aesthetically-appealing water heater is that it has a space-saving design and thus can fit neatly in any area of your home.

    It has a 1.5GPM, which certainly suits small homes such an apartment. Unfortunately, this makes it an unsuitable option for a larger family.

    2. Stiebel Eltron Tankless Water Heater

    • Has high flow rate.
    • Features a thin design.
    • Advanced flow control to help maintain water temperature of different appliances.
    • Easy to operate.
    • 7-year leakage warranty.
    • It’s pretty expensive.

    Stiebel Eltron tankless water heater is also a decent option for those who are looking for a tankless water heater that can serve a larger family. The unit is backed by a three-year warranty on parts and 7-year warranty for leakage.

    Another outstanding feature of this unit is that it functions in silence, which means you won’t have to deal with noise in the kitchen.

    In addition, it has a generous five GPM, which means it can serve three showers simultaneously making it suitable for a big family.

    Although not the smallest on our list, has a thin design and thus won’t take up a lot of space in your house.

    The advanced flow control is another nifty feature that enable this unit to maintain the temperature of the water appliance. With this feature, you get constant GPM even when there’s water coming out of taps concurrently.

    3. Rheem Tankless Water Heater RTEX-18

    • Modern design with external digital thermostatic control.
    • Durable copper immersions for longevity.
    • Simple installation process.
    • Easy to find replacement parts.
    • High GPM making it ideal for a bigger home.
    • 360-degree installation.
    • Short warranty period.
    • Quite pricey.

    For people who want a modernized water heater that’s also durable, the Rheem tankless water heater is an option you can consider. With easy to repair and replaceable parts, this water heater offers good value for your money.

    It has a 360-degrees installation, meaning that it can fit virtually everywhere. It’s very easy to install and its thin exteriors improves the possibilities of installations.

    The unit has high GPM of up to 4.4, making it perfect for a house with two or more showers. Its high GPM makes them ideal for bigger homes where multiple appliances are often used simultaneously.

    In addition to having replaceable parts, the interior of Rheem water heater is made of brass and copper. This help to increase durability.

    4. Bosch Electric Mini Tank Water Heater

    • Easy installation process.
    • Premium construction.
    • Everything needed for installation is included.
    • Restrictive due to its point-of-use design.

    Bosch is a renowned brand and this electric mini tank is among its most convenient models. Being a point-of-use tank means that you can install this equipment under your sink.

    This mini-tank can serve two sinks simultaneously. It has a 98% thermal efficiency rating, thereby guaranteeing satisfaction. Not only is this device easy to set up, but also more durable than many in its category thereby giving you good value for your money.

    You can do the installation work yourself without the help of a plumber.

    5. Eemax Tankless Water Heater EEM24018

    • Aesthetically-appealing exterior.
    • Decent GPM.
    • Durable and thus will serve you for years.
    • Short warranty period.

    The Eemax Tankless Water Heater has a shiny, aesthetically-pleasing design and thus will add some spark in your kitchen. With a commendable GPM of 3.5, this tankless water heater suits a big family with multiple appliances. 

    As per Eemax description, this unit can supply water to one shower and two sink during winter or four showers during summer. This is a great option for a home with different water appliances such as a washing machine and dishwasher.

    All these best small tankless water heaters have garnered a massive number of positive reviews, making them a good choice. Get one for your hot water needs.

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    Hi! I'm Edmundas, a devoted minimalist and expert in making the most out of small spaces. Through years of experience in interior design and innovative space-saving solutions, I've mastered the art of transforming compact areas into functional, stylish havens. Here at GotinySpace, I share my insights and tips to help you embrace a simpler, more organized lifestyle. Join me on this journey to discover how less can indeed be more.