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The 5 Best Tankless Water Heaters

Hot water shouldn’t be just a luxury. We use it in everyday life, for cleaning our homes and ourselves. But sometimes, a traditional water heater doesn’t have the capability of giving you what you need. Tankless water heaters supply endless hot water anywhere in the house, on demand, and that is great to meet the demands of your family as well as to add a little luxury to your life.

Why Use a Tankless Water Heater?

With a tankless water heater, you don’t have to worry about overtaxing your traditional water heater and running out of hot water at the worst possible time. You can relax in the shower and do all of your laundry and dishes without concern, as well as almost no wait time for the water to heat. Even more importantly, the investment you put into tankless water heaters will save you money in the long run because you won’t have gas and electric running to maintain the water temperature constantly. And because most tankless water heaters are localized, they don’t take up much space at all. So, how do you choose a tankless water heater?

Top 5 Best Tankless Water Heater Reviews

To help you better understand what the best tankless water heaters have to offer, we’ve compiled a list of our top picks with easy to digest details on each.

1. Stiebel Eltron Tankless Water Heater

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The Stiebel Eltron tankless water heater provides an endless flow of hot water on demand, allowing you to enjoy a hot shower as long as you’d like, as well as assuring you always have hot water when needed. It heats water to a range of 86-140 degrees, based on your settings, and there is only a few seconds’ wait for that heat immediately upon request.

The water heater has an easy to read digital temperature gauge, and it operates silently, so you don’t have to worry about excess noise under your sink or in your bathroom. In addition, its small size makes it easy to install anywhere, so you can add one to any source of water in your home for a complete solution.

This particular unit is also eco-friendly. There is no venting required, and it has automatic modulation capability, which saves you even more energy. The Stiebel Eltron tankless water heater has a 7-year warranty on leakage and a 3-year warranty parts, so you can rest assured it will offer you long lasting quality. Like many appliances, the water heater runs on 240 volts for great power output, while still remaining efficient.

high-end option
Stiebel Eltron Tankless Water Heater
Stiebel Eltron Tankless Water Heater

Hot showers will never be interrupted again. Enjoy continuous, on-demand hot water with an unlimited supply, when you want it without wasting any energy when not needed.

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  • Small and lightweight for easy installation
  • Operates on a broad temperature range
  • Easy digital temperature readout
  • Eco-friendly with automatic modulation
  • Long warranty for peace of mind


  • May require expert installation
  • The price point is higher than the average

2. ThermoPro Series Tankless Water Heater

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The Atmore ThermoPro Series tankless water heater ranks well in terms of cost, ease of use, and durability, not to mention overall performance. The digital temperature control is easy to use, much more so than the dials on old, traditional water heaters, and you can make changes in increments of a single degree for precision, with full range up to 135 degrees.

In addition, the interior of the water heater is made of stainless steel, so there is resistance to corrosion, which leads to greater efficiency in heating as well as a longer lasting product. And even with the savings through low power requirements and localized heating processes, you get instant piping hot water with little wait. The unit is rated to heat water as cold as 37 degrees flowing at nearly 2 gallons per minute to your desired temperature.

best overall
ThermoPro Series Tankless Water Heater
ThermoPro Series Tankless Water Heater

Digital temperature control allows you to set your temperature in increments of 1°. Thermostatic control range from 90-135°f

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  • Self-modulating system regulates water flow
  • Programmable with 1-degree increments for precision
  • Heats cold water faster than average
  • Easy to use with digital readout
  • Durable with stainless steel interior


  • Still a bit costly
  • May not be sufficient for cold climates

3. Bosch Electric Mini-Tank Water Heater

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The Bosch Electric Mini-Water Heater is a little different than most of the ‘tankless’ devices used to instantly heat water. This is a local, 4-gallon water heater that can fit in convenient locations, including under the sink, so you have an immediate source of hot water on demand. It can be mounted to the wall, the floor, or a shelf, and it conveniently plugs into a standard outlet.

Because the tank is so small, it refills and heats quickly for continuous output. It also allows you to use one of these water heaters only where you really need it, so all the hot water from a larger heater can go toward the shower while you have instant local hot water at any sink or other area of the house.

The water heater is low maintenance and has glass lining for long lasting use. The durable materials mean that you won’t have to worry about replacement quickly. It’s also highly efficient, rated at 98% efficiency, so you don’t lose out on power.

best value
Bosch Electric Mini-Tank Water Heater
Bosch Electric Mini-Tank Water Heater

4 gallon point-of-use mini-tank fits under your sink to provide hot water right where you need it.

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  • Easily, local installation
  • Instant hot water at any location in the house
  • Affordable price
  • Ease of installation – plugs to 120VAC outlet


  • Still requires a tank
  • Need to find installation location

4. Rinnai V Series HE Tankless Hot Water Heater

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The Rinnai Tankless water heater is a great solution if you don’t have a local place to mount a tankless water heater. Perhaps you don’t have enough under-counter space and need a different solution, or you want to have instant hot water in the entire house. Rinnai has created a high efficiency tankless water heater that feeds off natural gas and is installed outdoors.

Depending on ground temperature, the Rinnai tankless heater can provide heat instantly for up to 5.3 gallons per minute flow, which is far better than the average tankless heater. In addition, you can control it with a mobile app, setting schedules, timers, and even vacation mode when you’re away so you don’t use unnecessary energy.

In addition, the Rinnai tankless water heater is backed by a significant set of warranties, including 10 years on the heat exchanger, 12 months for labor, and 5 years for parts. This makes it great for your peace of mind, so you have no hassle with any product issues.

easiest to use
Rinnai V Series HE Tankless Hot Water Heater
Rinnai V Series HE Tankless Hot Water Heater

Control-R 2.0 mobile app features timers and schedules throughout the day and allows you to remotely put the system into vacation mode.

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  • Easy to use no matter your situation
  • High powered with gas
  • Programmable and connects to an app for settings
  • Backed by great warranties


  • Requires natural gas hookup
  • Outdoor unit – need outdoor space

5. EcoSmart ECO 27 Electric Tankless Water Heater

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Considering that it can handle a whole house (depending on how high your demand is and the size of the home), the EcoSmart electric tankless water heater is perhaps the best bargain around. The cost is similar to single location units, but it is capable of handling the entire house and saving you up to 50% of the cost of heating your water.

In addition, the size of your water heater means less storage space, regardless of its location. The EcoSmart tankless heater gives you great performance and instant hot water while also freeing up a great deal of space for more storage, whether in an attic, basement, or closet. There’s no need to hold a tank full of hot water, the unit heating the water as it passes through.

It also incorporates advanced self-modulating technology, so it never utilizes excess energy. You also get the expertise of the company in choosing the right model for your needs, sized based on location (for average ground temperature), as well as the capacity based on your usage.

bargain buy
EcoSmart ECO 27 Electric Tankless Water Heater
EcoSmart ECO 27 Electric Tankless Water Heater

Savings of up to 50% on water heating costs.

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  • Small to increase storage space
  • Instant hot water for the whole house at a similar cost to one location units
  • Multiple sizes available for various applications
  • Limited lifetime warranty


  • May be difficult to install
  • Capacity may not be enough for high demand

The Bottom Line

When it comes to having hot water, getting instant results and not wasting energy are high priority. With a tankless water heater that fits your lifestyle and your budget, you can easily accomplish both and feel satisfied that you’ve taken the right step in upgrading your home.