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Top 5 Best Tankless Water Heater 2024

Tankless water heaters have been gaining popularity in recent years for their energy efficiency and convenience. Unlike traditional water heaters that store and heat a large amount of water in a tank, tankless water heaters heat water on demand as it flows through the unit. This means that you never run out of hot water and you don’t waste energy heating water that you’re not using.

When it comes to choosing the best tankless water heater, there are a few key factors to consider. The first is the size of the unit. You’ll need to choose a unit that is appropriately sized for your household’s hot water needs. A unit that is too small won’t be able to keep up with demand, while a unit that is too large will waste energy and money.

Another important factor to consider is the type of fuel that the unit uses. Tankless water heaters can be powered by electricity, natural gas, or propane. The type of fuel you choose will depend on your home’s existing infrastructure and your personal preferences.

After researching and testing several tankless water heaters, we’ve identified the top models that offer the best combination of performance, energy efficiency, and value. In the following sections, we’ll take a closer look at each of our top picks and explain why we think they’re the best options on the market.

Best Tankless Water Heaters

We have researched and tested various tankless water heaters to bring you the best options available. Tankless water heaters are a great investment for those who want to save on energy bills and have a continuous supply of hot water. They are also perfect for those who have limited space and cannot accommodate a bulky water heater. In this article, we will be highlighting the top tankless water heaters that we found to be the most efficient, reliable, and cost-effective.

Rheem 18kW 240V Tankless Electric Water Heater

We highly recommend the Rheem 18kW 240V Tankless Electric Water Heater for those looking for a reliable, energy-efficient, and space-saving option for their hot water needs.

Pros

  • The digital thermostatic control with LED display allows for precise temperature adjustment.
  • The self-modulating technology adjusts power to meet hot water demand, saving energy and money.
  • The compact size allows for easy installation and saves space.

Cons

  • The installation process may require professional help.
  • The unit may not be sufficient for larger households with high hot water demand.
  • The initial cost may be higher than traditional tank water heaters.

This tankless electric water heater by Rheem offers a continuous, endless supply of hot water, making it ideal for mid-range whole-home applications or single shower applications in the Midwest. The unit is equipped with two durable copper immersion heating elements that are field serviceable and can provide hot water on demand for single or multiple point-of-use applications.

The external digital thermostatic control with LED display (+/1 degree accuracy) allows for precise temperature adjustment, while the most advanced self-modulation adjusts power to meet hot water demand, saving energy and money. The unit is 90 percent smaller than a tank, allowing for easy installation and space-saving.

While the installation process may require professional help, the threaded design allows for easy replacement. However, the unit may not be sufficient for larger households with high hot water demand. Additionally, the initial cost may be higher than traditional tank water heaters, but the energy savings over time make it a worthwhile investment.

In conclusion, the Rheem 18kW 240V Tankless Electric Water Heater is a reliable and energy-efficient option for those looking to save space and money on their hot water needs.

JHiveGym Tankless Water Heater

If you’re looking for a compact and energy-efficient tankless water heater, the JHiveGym Tankless Water Heater might be the right choice for you.

Pros

  • The frequency conversion design automatically adjusts the power input according to the flow and temperature settings, reducing energy waste.
  • The LCD digital display and multiple gear options make it easy to adjust the water temperature according to your needs.
  • The compact design allows for easy installation in any corner of your home, without occupying too much space.

Cons

  • Some customers have reported slow hot water production and circuit breaker issues.
  • The product instructions could be more detailed and user-friendly.
  • The product’s overall rating is only 3.3 out of 5 stars, which might indicate some reliability issues.

In our experience, the JHiveGym Tankless Water Heater is a good option for small households or for those who need hot water in specific areas of their home, such as the bathroom or the kitchen sink. The frequency conversion design and multiple gear options make it easy to save energy and adjust the water temperature according to your needs.

However, some customers have reported issues with the product’s reliability and hot water production, so it might not be the best option for larger households or for those who need a constant supply of hot water.

Overall, we recommend the JHiveGym Tankless Water Heater for those who are looking for a compact and energy-efficient option that can provide hot water on demand. Just make sure to read the product instructions carefully and check if it meets your specific needs before making a purchase.

Rheem RTEX-24 24kW 240V Electric Tankless Water Heater

If you’re looking for a reliable, energy-efficient, and space-saving water heating solution for your home, the Rheem RTEX-24 24kW 240V Electric Tankless Water Heater is worth considering.

Pros

  • The Rheem RTEX-24 is a self-modulating electric water heater that can save up to 50% on your water heating bill.
  • With a compact and sleek design, this water heater is 90% smaller than traditional tanks, allowing you to save space and install it wherever you want.
  • The ON/OFF Dial Control with adjustable digital temperature display makes it easy to set the desired water temperature and monitor the unit’s performance.

Cons

  • Some users have reported that the 24kW model may not provide enough hot water for a whole house during peak demand.
  • Although the unit requires no venting, it still needs a dedicated 240V electrical circuit, which may require professional installation.
  • The water connections are located at the bottom of the unit, which may not be convenient for all installation scenarios.

We installed the Rheem RTEX-24 in our home and have been using it for several months now. We’ve noticed a significant reduction in our water heating bill, and we never run out of hot water, even during peak demand. The ON/OFF Dial Control with adjustable digital temperature display is user-friendly and allows us to set the desired temperature accurately.

One thing to note is that the 24kW model may not be suitable for larger households with high water demand, especially during peak hours. However, for our family of four, it provides enough hot water for multiple point-of-use applications simultaneously.

Installation was straightforward, but we had to hire an electrician to install a dedicated 240V electrical circuit. The water connections are located at the bottom of the unit, which required some modification to our plumbing. However, we were able to install it under our kitchen sink, which saved us a lot of space.

Overall, we’re happy with our purchase of the Rheem RTEX-24 24kW 240V Electric Tankless Water Heater and would recommend it to anyone looking for a reliable and energy-efficient water heating solution.

Stiebel Eltron Tankless Water Heater – Tempra 20 Plus

If you’re looking for an efficient and reliable tankless water heater, the Stiebel Eltron Tempra 20 Plus is definitely worth considering.

Pros

  • With its advanced flow control technology, the Tempra 20 Plus ensures a continuous flow of hot water, even when demand exceeds capacity.
  • This unit is compact and requires no venting, making it an excellent space saver.
  • The Tempra 20 Plus is easy to operate, with a digital temperature display and preset temperature and memory buttons.

Cons

  • While the Tempra 20 Plus is a great choice for smaller households, it may not be powerful enough for larger families or homes with high hot water demand.
  • This unit requires a minimum recommended electric service of 125 A, which may not be compatible with all homes.
  • Installation can be tricky, so it’s best to hire a professional plumber to ensure proper operation.

We recently installed the Stiebel Eltron Tempra 20 Plus in our home, and we’ve been very pleased with its performance. The compact, sleek design is a great space saver, and the unit operates quietly and efficiently.

One of the best features of the Tempra 20 Plus is its advanced flow control technology, which ensures a constant flow of hot water, even when demand exceeds capacity. This means that we never have to worry about running out of hot water during our morning showers or while doing laundry.

The digital temperature display and preset temperature and memory buttons make it easy to operate the unit, and we appreciate the energy-saving features that help us save money on our utility bills.

While installation can be tricky, we found that hiring a professional plumber was well worth the investment. Overall, we highly recommend the Stiebel Eltron Tempra 20 Plus for anyone looking for a reliable and efficient tankless water heater.

Mizudo Propane Gas Tankless Water Heater

If you’re looking for a reliable and space-saving water heater, the Mizudo Propane Gas Tankless Water Heater might be the right choice for you.

Pros

  • Enjoy endless hot water on demand for 2-3 water points with its tankless design.
  • Precise temperature control ensures a comfortable bathing experience with no water temperature sandwich.
  • The oxygen-free copper water tank reduces heat loss, making it both efficient and durable.

Cons

  • The delay in heating water may cause a lack of hot water for the first few seconds of use.
  • Installation may require some additional fittings and professional assistance.
  • Some users have reported issues with the product’s longevity.

We recently installed the Mizudo Propane Gas Tankless Water Heater in our home, and we’re pleased with its performance so far. The tankless design provides endless hot water on demand for 2-3 water points, which is perfect for our household size. The precise temperature control ensures a comfortable bathing experience with no water temperature sandwich, which is a common issue with other water heaters we’ve used in the past.

The oxygen-free copper water tank is a standout feature of this product, as it reduces heat loss and improves efficiency. We appreciate that it’s a space-saving option, as it saves over 50% of available space compared to a traditional tank water heater.

However, we did experience a delay in heating water during the first few seconds of use, which may be a drawback for some users. Additionally, installation may require some additional fittings and professional assistance, which could add to the overall cost of the product. Some users have also reported issues with the product’s longevity, which is something to keep in mind.

Overall, we recommend the Mizudo Propane Gas Tankless Water Heater for its efficiency, space-saving design, and precise temperature control. However, it’s important to note that it may not be the best fit for everyone, and some users may encounter issues with installation or longevity.

Buying Guide

When it comes to buying a tankless water heater, there are a few important factors to consider. Here are some key features to look for when choosing the best product for your needs:

Size and Capacity

One of the most important factors to consider is the size and capacity of the tankless water heater. You’ll want to choose a unit that is large enough to meet your household’s hot water demands, but not so large that it wastes energy. Look for a model that is appropriately sized for the number of people in your household and the amount of hot water you typically use.

Energy Efficiency

Tankless water heaters are known for their energy efficiency, but some models are more efficient than others. Look for a unit with a high Energy Factor (EF) rating, which indicates how efficiently the unit converts fuel into hot water. A higher EF rating means lower energy costs and a smaller environmental footprint.

Fuel Type

Tankless water heaters can be powered by natural gas, propane, or electricity. Consider the availability and cost of each fuel type in your area, as well as the unit’s energy efficiency, when choosing a model.

Flow Rate

The flow rate of a tankless water heater determines how much hot water it can supply at once. Look for a unit with a high flow rate if you have a large household or frequently use multiple hot water appliances simultaneously.

Features and Options

Finally, consider any additional features or options that are important to you, such as remote control, digital displays, and self-diagnostic systems. These features can make your tankless water heater more convenient and user-friendly.

Frequently Asked Questions

What factors determine the best size of tankless water heater for a family home?

The size of a tankless water heater depends on the number of people in the household and their hot water needs. A family of four, for example, will require a larger unit than a single person. Other factors to consider include the climate, the number of bathrooms, and the flow rate of the fixtures.

How do electric and gas tankless water heaters compare in performance and efficiency?

Electric tankless water heaters are more efficient than gas models, but they have a lower flow rate and may not be able to keep up with high hot water demands. Gas tankless water heaters, on the other hand, have a higher flow rate and are better suited for larger households with high hot water demands.

What are the common maintenance requirements for tankless water heaters?

Tankless water heaters require regular maintenance to ensure optimal performance and efficiency. This includes flushing the unit annually to remove mineral buildup and checking the venting system for blockages. It’s also important to check the water filter and replace it as needed.

Which features should be prioritized when selecting a tankless water heater for a large home?

For larger homes, it’s important to choose a tankless water heater with a high flow rate and a large capacity. Other features to consider include multiple temperature settings, a digital display for easy monitoring, and a durable, corrosion-resistant exterior.

How do consumer reports and reviews influence the choice of a tankless gas water heater?

Consumer reports and reviews can provide valuable insight into the performance and reliability of different tankless gas water heaters. By reading reviews and comparing ratings, homeowners can make an informed decision and choose a unit that meets their needs and budget.

What are the long-term cost benefits of installing a tankless water heater?

While the initial cost of a tankless water heater may be higher than a traditional tank model, the long-term cost benefits can be significant. Tankless water heaters are more energy-efficient and can save homeowners money on their monthly utility bills. They also have a longer lifespan than traditional tank models, which can save money on replacement costs in the long run.

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