10 Best Heat Pump Water Heaters — Side-by-Side Reviews

With so many heat pump water heaters on the market, choosing one can feel overwhelming. The specs look similar, the claims sound the same, and it’s hard to know which model actually delivers.

That’s why we put together this guide. A reliable water heater isn’t just about comfort. It’s about saving energy, reducing bills, and getting hot water without wasting resources.

We’ve compared efficiency, energy consumption, capacity, and build quality across 10 models so you can see exactly how they stack up before you buy.

Quick Comparison Chart

1. EcoSmart ECO 18 — Best Overall

The ECO 18 is ideal for those looking for tankless heating for small apartments or small point-of-use applications. For a plug-in option, see our best 110v plug-in tankless water heaters. ECO 18 can heat two sinks and two showers at the same time in hot climates and one in cold climates shower and tub.

The digital temperature control allows the outlet temperature to be set in 1-degree increments so that the temperature can be adjusted between 80 degrees F and 140 degrees F. Tankless water heaters can be installed at multiple points of use in the home, away from the central water heater, or larger centralized models can be used to meet all the household’s hot water needs.

The water heater is usually turned off but is equipped with a flow sensor that activates it when water flows through the water heater.

This is an essential range for instant water heaters. It’s suitable for renovations, communities, churches, and modular buildings.

It offers simple installation and high operational efficiency and saves valuable time. ECO18 has its own patented self-adjusting technology that precisely adjusts the amount of energy needed to heat the amount of water you need.

The tankless ECO 18 is the ultimate energy efficiency, but it saves you money. What’s more, it’s compact and can be wall-mounted, giving you more storage space.

Best of all, this model is the only electric tankless water heater on the market with a lifetime warranty.

2. Bosch Electric Mini-Tank — Best Mini-Tank

The Bosch is ideal for those who have a small apartment and are looking for a mini-tank. This mini-tank heater uses three different uses as the sole source of water heating for a sink.

There are 4 gallons at the point of use, and it slides under the sink to provide hot water where you need it. It has a 98% thermal efficiency size: 13.75 W x 13.75 H x 13.5 D inches of high-quality glass material that can be used for a long time.

Eliminate long waits for hot water because it heats both sinks and showers at the same time. You can have hot water on demand for all your needs, even in hot and cold climates.

Bosch uses three different applications as the sole heat source for a single tank, an existing heating system away from the tank, and an in-line buffer system without tank heating. The mini-tank can be installed at several points of use in the home.

Thanks to its elegant and attractive design, it blends perfectly into the decor when installed in a visible position. These tankless radiators are a great energy-saving option when you save energy, and you save money.

Also, the Tronic takes up much less space than a conventional furnace sink, taking up virtually no space. Since they run on electricity and don’t store water.

3. Stiebel Eltron Mini Electric — Best Commercial

The SHC is ideal for offices, stores, shopping centers, warehouses, supply trucks, restaurants, gas stations, schools, hotels and motels, and ideal for commercial, industrial, and institutional facilities looking for a mini water heater tank.

This is a mini water heater that serves as the sole source of water heating for the sink and has three different uses. There are 2.5 gallons at the point of use, and it slides under the sink to provide hot water where you need it.

It has a thermal efficiency of 86 to 140 degrees F. And it provides hot water almost instantly, keeping water comfort and energy efficiency wherever hot water is needed.

You can have hot water on demand for all your needs, even in hot and cold climates. Installed with cold water and used as a separate hot water source, or connected to hot water from a remote tank to reduce delays, CHS is always available when needed.

Freezing can be selected to maintain the internal tank temperature above freezing. These tankless radiators are perfect for energy efficiency, saving you energy and money.

4. Eemax Electric Tankless — Best Point-of-Use

This product is ideal for those looking for a single point tankless heater. A point-of-use tankless water heater is located right next to where it’s used, so the water is almost instantly hot, reducing water waste.

Eemax tankless water heaters can also be more energy-efficient than centrally installed tankless water heaters due to the length of the supply line after the flow is shut off.

Even houses or buildings with a high demand for hot water can save money. If the priority is to provide instant hot water to the tap for a limited period, a recirculation system with a water level meter and timer can be used to reduce heat loss.

The water heater is usually turned off but is equipped with a flow sensor that activates it when water flows through the water heater. The water circulates in a copper heat exchanger, heated by a gas or electric heater.

Instantaneous water heater with integrated stainless steel and intelligent anti-scald to prevent overheating to 55 degrees C. The Eemax tankless model can save you up to 50% on your hot water bill.

The tank is covered with glass for a longer and more durable life. It meets the new market penetration requirements, and thanks to its design, it’s efficient and durable: a single-point appliance ideally suited for hand washing.

99% energy efficiency.

5. Chronomite Tankless Instant — Best Safety

It’s perfect for those looking for a water heater that provides hot water at will without the risk of burning in two seconds. The Chronomite is installed at the point of use, where the water is used, so that the water is almost instantly hot, reducing waste.

This significantly reduces the time it takes to deliver hot water and the inefficient use of electricity.

The stopwatch has a non-porous surface that doesn’t allow bacteria and other harmful microorganisms to grow. It facilitates cleaning and is a preferred choice for hospitals, laboratories, and the food industry.

Even houses or buildings with a high demand for hot water can save money.

It features patented microprocessor technology, the first of its kind. It allows you to preset or control the water temperature in less than two seconds and provides unlimited hot water without the 6-second scalding risk of other tankless water heaters.

6. Camplux Mini Electric Tank — Best Portable

CAMPLUX is ideal for those who have a wet bar, basement, patio kitchen, garage, attic, or even a camper or boat and are looking for tankless heating. It can treat 4 gallons of water and provide hot water where you need it.

It’s intended for indoor use and can only provide hot water for 2 or 3 sinks, which is enough for a shower. The Camplux ME series mini tank is designed with a glass liner, easy to maintain, and durable.

It’s also very efficient for heating and can improve your energy bills.

The CAMPLUX electric mini water heater of the ME series is light, compact, and can be mounted on the floor, on a shelf, or the wall.

Connect the cold water line and install the water heater on the sink to provide hot water and install the water heater on the sink. Portability, energy efficiency, and innovation are the three vital elements of CAMPLUX products.

The adjustable thermostat, once set, automatically controls the water temperature. The red light stays on while the water is heating.

The installation of the device seems rather difficult due to the manufacturer’s lack of detailed information.

7. EcoSmart ECO 27 — Best Efficiency

The ECO 27 is ideal for those looking for the most efficient heating system on the market. Although ECO27 tankless water heaters are more expensive, they’re generally less costly to operate due to their low energy consumption.

He can run two showers at the same time and never runs out of hot water. In the event of a power failure, tankless electric radiators can’t provide hot water, unlike a tankless water heater, which can provide hot water stored in a water tank.

Digital thermostats allow you to adjust the temperature in 1-degree increments so that you can set the temperature from 80 degrees Fahrenheit to 140 degrees Fahrenheit. The unit is ideal for the northern part of the United States, where the inlet water temperature can drop as low as 37 degrees F.

8. Rheem-18 Tankless — Best Digital Control

Rheem is ideal for those who have a small apartment and are looking for a tankless water heater. Rheem helps you to choose the volume of hot water.

Thanks to an external digital thermostat with an LED display (with an accuracy of +/- 1 degree).

You can choose the temperature setting, and it can be the kitchen, laundry sink, bathroom sink, and bathtub. When you open the valve, the set temperature will light up.

Automatic peak modulation adjusts the power to meet hot water demand. This is a high-quality unit that works with a 50A circuit breaker.

The outstanding feature is that you can run a prolonged flow, and this platform always regulates the temperature well. This means that by lowering the flow rate, for example, at a kitchen faucet, you can get boiling water.

9. Stiebel Eltron SHC Mini — Best Under-Sink

This product is ideal for those looking for a mini-tank. Stiebel Eltron SHC mini tanks come from Germany and are meant to place hot water where you need it for fast use and energy efficiency.

The elegant and seductive European design fits into any decor, whether exposed to view or hidden under a sink.

The Stiebel Eltron SHC mini electric water heater is ideal for office buildings, shops, shopping centers. With its flat back and an included stand, a CHS is easily mounted just under or near the sink.

Once filled with water, plug it into a 120V outlet. CHS saves space and quickly delivers hot water where it’s needed.

10. Rinnai Tankless — Best Smart Features

It’s ideal for those who have a small apartment and are looking for a tankless heater. It’s compact, easy to install, reliable, and perfect for outdoor use.

In the long run, this high-end product will save you money and energy. It uses 40% less energy than traditional water tanks because you only heat water when you need it.

The Control-R 2.0 mobile application includes timers and schedules throughout the day, allowing you to set the vacation mode remotely.

A Rinnai tankless water heater with ThermaCirc360 technology circulates hot water through the pipes to provide you with hot water quickly and reliably. Endless hot water for the whole house.

Something to Consider

Choosing the right heater becomes a real necessity. So, these top 10 courses on heat pump water heaters will help you all make the right choice.

The pump uses the heat from the air to release it into the water in the tank. This can include indoor air, indoor circulating air, CMV-ventilated air, and outdoor air.

These different water heaters respect the environment and use clean energy. For traditional electric tank models, see our best 50 gallon electric water heaters. If you need a gas option, our best 30 gallon gas water heaters guide is a great starting point.