Best Heat Pump for Hot Water: Top 10 Picks

The best heat pump for hot water offers incredible energy efficiency and consistent hot water supply for eco-conscious homeowners seeking significant utility savings. Selecting the right unit involves considering factors like capacity, energy factor (EF) ratings, and noise levels, as a mismatch can lead to underperformance and wasted investment. Different models excel in various climates, impacting their heating speed and overall efficiency.

An improperly sized or inefficient heat pump might struggle to meet demand or operate at a higher cost than anticipated. To help you make an informed decision, we’ve compiled a list of the top 10 contenders on the market today.

These options represent a range of features and performance metrics designed to suit diverse household needs and preferences. Explore these leading systems to find the perfect fit for your home’s hot water requirements.

The best heat pump for hot water systems delivers exceptional energy efficiency, such as the Rinnai REHP series with high Uniform Energy Factor (UEF) ratings, ranging from 3.75 to 4.These Energy Star Certified electric heat pump water heaters extract heat from ambient air to provide consistent hot water with zero emissions, significantly reducing energy costs compared to traditional water heaters.

Best Heat Pump for Hot Water at a Glance

Image	Product	Buy
Best Pick 1	Watts Heat H2O Hot Water Recirculation System w/Programmable Timer, Instant Best for: Instant hot water	Check Price
Best Pick 2	Rinnai REHP50 Electric Heat Pump Water Heater – 50 Gallon, Best for: Medium households	Check Price
Best Pick 3	Rinnai REHP65 Electric Heat Pump Water Heater‚ 65 Gallon, 240V, Best for: Large households	Check Price
Best Pick 4	BOSCH Electric Mini-Tank Water Heater Tronic 3000 T 2.5-Gallon (ES2.5) Best for: Small spaces	Check Price
Best Pick 5	Rinnai REHP80 Electric Heat Pump Water Heater ‚ 80 Gallon, Best for: Extra large households	Check Price

How We Picked

We prioritized Rinnai’s electric heat pump water heaters, specifically the REHP50, REHP65, and REHP80 models, for the best heat pump for hot water. These units excel in energy efficiency with high Uniform Energy Factor (UEF) ratings and Energy Star certification. We ruled out recirculation systems and mini-tanks as they don’t offer whole-home heating.

Tankless heaters were also excluded due to their different operational principles. The Rinnai models demonstrated superior performance through their ability to extract heat from ambient air and provide consistent, zero-emission hot water, reflecting a commitment to both value and advanced technology.

What Most Buyers Get Wrong

Understanding Heat Pump UEF Ratings

When choosing a heat pump water heater, the Uniform Energy Factor (UEF) is your key metric. A higher UEF means greater efficiency and lower operating costs. For example, both the Rinnai REHP65 and REHP80 boast impressive UEFs of 3.90 and 4.00 respectively, indicating superior energy extraction from the ambient air.

Look for Energy Star certified models like these Rinnai units to ensure you’re getting a top-performing, environmentally friendly option that significantly reduces energy consumption.

Sizing Your Heat Pump Water Heater Capacity

Selecting the right gallon capacity is crucial for meeting your household’s hot water demands without excessive energy use. For larger families or homes with high hot water usage, models like the Rinnai REHP80 (80 Gallon) offer ample capacity. Smaller households or those with less frequent demand might find the Rinnai REHP50 (50 Gallon) sufficient.

Consider your peak usage times and the number of people in your home to avoid the pitfalls of undersizing or oversizing your heat pump water heater.

1. Watts Heat H2O Hot Water Recirculation System w/Programmable Timer, Instant

Best for: Homeowners seeking instant hot water at multiple points.

This thermal bypass system delivers hot water in seconds at every faucet or shower with its 3.4 GPM flow rate, thanks to its sensor valve opening when the hot water line cools to 98°F. Its 120V operation makes it efficient and quiet for existing plumbing.

The system operates on a 120V power source, facilitating easy DIY installation without needing a return line or under-sink outlet. It actively pushes cooled water back to the water heater, ensuring hot water is readily available on demand.

Pros

• Instant hot water delivery at faucets and showers
• Thermal bypass technology conserves water
• 120V operation for easy integration
• Quiet and efficient system performance

Cons

• Not designed for use with tankless water heaters.

Homeowners looking to eliminate long waits for hot water at multiple fixtures will appreciate the instant delivery provided by this system. It’s ideal for upgrading comfort and reducing water waste in existing homes.

2. Rinnai REHP50 Electric Heat Pump Water Heater – 50 Gallon,

Best for: Households of 3-4 needing high-volume hot water.

The Rinnai REHP50, a 50-gallon heat pump water heater, provides up to 73 gallons in the first hour, ideal for busy households. Its Energy Star certification and UEF of 3.75 ensure energy-efficient performance.

Operating on 240V, this wall-mounted electric unit features heat pump technology to extract heat from ambient air, delivering consistent hot water with zero emissions. It’s also demand-response enabled to reduce energy usage during peak utility hours.

Pros

• High first-hour delivery of 73 gallons
• Energy Star Certified for efficiency
• Durable and reliable heat pump design
• Demand-response enabled for cost savings

Cons

• Not a smart home compatible unit.

For households of 3-4 with consistently high hot water demand, this 50-gallon Rinnai unit offers a robust and energy-efficient solution. Its substantial first-hour delivery ensures everyone gets hot water when needed.

3. Rinnai REHP65 Electric Heat Pump Water Heater‚ 65 Gallon, 240V,

Best for: Families of 4-5 with high hot water usage needs.

With a 65-gallon capacity and an impressive Uniform Energy Factor (UEF) of 3.90, this Rinnai REHP65 heat pump water heater provides up to 80 gallons of hot water in the first hour. It’s Energy Star Certified for reduced energy costs.

This 240V electric unit leverages heat pump technology for efficient operation, extracting heat from the air to deliver consistent hot water with zero emissions. Its demand-response capability allows for utility cost savings by managing energy usage during peak times.

Pros

• First-hour delivery of up to 80 gallons
• High UEF of 3.90 for energy savings
• Energy Star Certified performance
• Demand-response enabled feature

Cons

• Not a smart home compatible unit.

Families of 4-5 experiencing high demand for hot water will find this 65-gallon Rinnai heat pump water heater well-suited. Its capacity and efficiency provide ample hot water while keeping energy costs down.

4. BOSCH Electric Mini-Tank Water Heater Tronic 3000 T 2.5-Gallon (ES2.5)

Best for: Small space point-of-use hot water needs.

The Bosch Tronic 3000 T is a 2.5-gallon mini-tank that fits conveniently under your sink, providing hot water right where it’s needed with 98% thermal efficiency. It operates using a standard 120-volt outlet.

This electric water heater is designed for easy maintenance and features a premium glass-lined material for long service life. Its compact dimensions (13.75″ W x 13.75″ H x 10.75″ D) allow for independent installation in tight spaces.

Pros

• Point-of-use hot water convenience
• 98% thermal efficiency
• Compact under-sink design
• Durable glass-lined interior

Cons

• Requires manual addition of cream or ingredients after frying due to its small tank size.

For those needing hot water directly at a single sink or fixture, this 2.5-gallon Bosch mini-tank is an excellent choice. Its compact size and 120V plug-in design make installation straightforward.

5. Rinnai REHP80 Electric Heat Pump Water Heater ‚ 80 Gallon,

Best for: Large households (5+) with maximum hot water demand.

Boasting a massive 80-gallon capacity and an exceptional Uniform Energy Factor (UEF) of 4.00, the Rinnai REHP80 delivers up to 91 gallons of hot water in the first hour. This Energy Star Certified model minimizes energy costs.

This 240V electric heat pump water heater employs advanced technology to extract heat from the ambient air, providing a consistent supply of hot water with zero emissions. It’s also demand-response enabled, linking with utilities to reduce usage during peak power demands.

Pros

• Highest first-hour delivery up to 91 gallons
• Top-tier UEF of 4.00 for peak efficiency
• Energy Star Certified performance
• Demand-response enabled for utility savings

Cons

• Not a smart home compatible unit.

Families of 5 or more with the highest hot water demands will benefit most from this 80-gallon Rinnai heat pump water heater. It guarantees ample hot water and superior energy efficiency for large households.

6. GE Appliances 10 Gallon Versatile Plug and Play Electric Water

Best for: Apartments, RVs, or small spaces needing supplemental hot water.

The GE Appliances 10-gallon electric water heater provides 120V plug-and-play installation, making it versatile for kitchens, bathrooms, RVs, or cabins where space is limited. It offers flexibility as a standalone or booster unit.

This unit features a rustproof design and an adjustable thermostat, allowing for a maximum temperature of 140°F. Its compact 10-gallon tank and 150 PSI maximum pressure rating make it suitable for various supplemental hot water applications.

Pros

• Easy 120V plug-and-play installation
• Compact and versatile for small spaces
• Adjustable thermostat up to 140°F
• Works as a standalone or booster unit

Cons

• No integrated filling nozzle, requiring cream or other ingredients to be added after frying.

Ideal for apartments, RVs, cabins, or garages needing a compact hot water solution, this 10-gallon GE water heater offers easy installation. It functions effectively on its own or in conjunction with another water heater.

7. Wassermann Instant Hot Water Recirculating Pump Kit for Tank Water

Best for: Homes without a return line needing instant hot water.

This Wassermann recirculating pump kit ensures hot water within seconds at every faucet without a return line, using thermal bypass technology. The adjustable temperature sensing bypass valve regulates circulation up to 100.4°F.

With a flow rate of 5 Gallons Per Minute and a maximum lifting height of 7.5 Feet, this 115V AC-powered system is designed for easy installation. It eliminates long waits and wasted water by recycling cooled water back to the tank.

Pros

• Instant hot water without a return line
• Adjustable temperature sensing valve
• Eliminates water waste
• 115V AC power operation

Cons

• Manual button press required to adjust temperature above 100.4°F.

For homeowners seeking instant hot water without the complexity of installing a return line, this Wassermann pump kit is an excellent solution. It’s designed to be easily installed and effectively delivers hot water on demand.

8. Rheem 240V Heating Chamber RTEX-13 Residential Tankless Water Heater, GRAY

Best for: High-efficiency whole-home tankless hot water replacement.

The Rheem RTEX-13 is a 240V tankless water heater with 99.8% energy efficiency, featuring durable copper immersion heating elements and an external digital thermostatic control with LED display for precise temperature adjustments.

This electric unit delivers 4.8 Gallons Per Minute with a maximum heat output of 13 Kilowatts. Its simple installation includes 1/2″ NPT adapters and side compression water connections, offering field-serviceable components for longevity.

Pros

• 99.8% energy efficiency
• Precise temperature control with LED display
• Durable copper heating elements
• Simple 1/2″ NPT installation

Cons

• No water-saver shower head is included with this unit.

Ideal for homes needing a high-efficiency, whole-home tankless hot water solution, the Rheem RTEX-13 provides on-demand heating. Its precise temperature control and durable construction ensure consistent hot water delivery.

9. Westinghouse Tankless Water Heater Electric 14kW 240V, Instant On-Demand Hot

Best for: Smart home users needing on-demand hot water.

This Westinghouse 14kW electric tankless water heater operates at 240V and provides up to 3.38 GPM of instant hot water, with smart home compatibility for voice control. It requires a dedicated 60-amp breaker and 6 AWG wire.

The unit boasts a 14,000-watt heating output and a starting flow rate of only 0.5 GPM, ensuring efficient operation. Its wall-mount design and bottom 1/2-inch NPT water connection facilitate installation.

Pros

• Instant on-demand hot water up to 3.38 GPM
• Smart home compatible (Google Assistant, Alexa)
• 14kW high power output
• ETL Certified for safety

Cons

• Requires a dedicated 60-amp double-pole circuit breaker and 6 AWG wire.

For tech-savvy households prioritizing instant, endless hot water and smart home integration, this Westinghouse tankless unit is a powerful choice. It efficiently heats water on demand for multiple fixtures.

10. Hot Water Recirculating Pump Kit for Tank Water Heater, Circulation

Best for: DIYers seeking an easy-install recirculating pump kit.

The VERIWIS hot water recirculating pump kit delivers hot water within 10 seconds using thermal bypass technology, recycling cooled water back to the tank without a return line. This kit pays for itself within 2-3 years through reduced costs.

This complete kit includes an adjustable temperature sensing valve, mounting brackets, a timer, and various fittings for effortless DIY installation. It operates on AC power and comes with a 3-year warranty from VERIWIS.

Pros

• Instant hot water within 10 seconds
• Pays for itself within 2-3 years
• Effortless DIY installation included
• Comes with a 3-year warranty

Cons

• No integrated filling nozzle, so cream is added after frying.

Homeowners looking to save water and money while upgrading comfort will find this VERIWIS recirculating pump kit ideal. Its simple installation and quick hot water delivery make it a practical choice for any tank water heater.

Tankless vs. Recirculation: The True Hot Water Divide

The defining characteristic of an effective hot water system isn’t its energy efficiency rating, but its ability to deliver hot water precisely when and where it is needed, without delay or waste. This fundamental need separates the true solutions for instant hot water from those that merely optimize a traditional tank. Consumers often focus on UEF numbers like the 3.75 of the Rinnai REHP50 Electric Heat Pump Water Heater or the higher 4.00 of the Rinnai REHP80, overlooking that these are all tank-based systems, albeit highly efficient ones at generating hot water.

They still require plumbing to bring that hot water from the tank to a distant faucet.

In stark contrast, systems like the Watts Heat H2O Hot Water Recirculation System w/ Programmable Timer and the Wassermann Instant Hot Water Recirculating Pump Kit for Tank Water Heater operate on a different principle. Their instant delivery is achieved through clever plumbing loops and bypass technology, not by eliminating the wait time from a tank. These are best suited for situations where the primary issue is the distance between an existing water heater and a fixture, and the goal is to eliminate that wait, not necessarily to replace the main water heating appliance.

The BOSCH Electric Mini-Tank Water Heater Tronic 3000 T 2.5-Gallon (ES2.5) also addresses point-of-use needs but acts as a small, supplemental tank, requiring its own wiring and plumbing rather than recirculating from a central source.

While the Rinnai REHP65 Electric Heat Pump Water Heater and REHP80 offer significant energy savings through heat pump technology and deliver large volumes of hot water, making them excellent choices for whole-house replacement of older, inefficient tanks, they do not inherently solve the wait time problem for distant or newly added bathrooms. The Rheem 240V Heating Chamber RTEX-13 Residential Tankless Water Heater and Westinghouse Tankless Water Heater Electric 14kW 240V are different still, providing on-demand heating without a tank, but they still require specific electrical circuits and deliver hot water at a rate dictated by their flow capacity, not by instantaneous delivery at the tap.

Ultimately, the choice hinges on whether the core problem is the generation of hot water (favoring heat pump or tankless units) or the delivery of that water to the point of use. If your primary pain is waiting for hot water to travel from your main tank, a recirculation system is your direct solution. For those seeking to upgrade an aging, inefficient central water heater, the high UEF Rinnai electric heat pump models are compelling investments.

The Rinnai REHP80 Electric Heat Pump Water Heater is a prime example for homeowners needing substantial capacity and efficiency from their main water heating source.

What to Look For in a Heat Pump for Hot Water

Capacity and water heating needs

To select the ideal heat pump water heater, start by assessing your household’s hot water consumption. For a typical family of four, a 50-gallon unit is often sufficient, but larger families or those with multiple bathrooms, especially those with high-flow showerheads, should opt for 65-gallon or larger models. A high recovery rate, meaning how quickly hot water is replenished, is crucial to avoid running out during peak times.

Look for units with a recovery rate of at least 20 gallons per hour. Prioritize larger capacity tanks and faster recovery rates to ensure you always have enough hot water.

Energy efficiency ratings

Your heat pump water heater’s efficiency is paramount for long-term savings. Seek out models with a Uniform Energy Factor (UEF) of 3.0 or higher. An Energy Star certification guarantees that the unit meets stringent energy performance standards.

While climate does influence efficiency, a higher UEF score indicates superior performance regardless of your location. Pay close attention to the estimated annual operating costs provided by manufacturers; lower figures directly translate to greater savings on your utility bills.

Choose units with the highest UEF score and Energy Star certification to maximize efficiency.

Installation requirements and space

Consider the physical space and installation demands of your heat pump water heater. Ensure the chosen unit has adequate clearance around it, typically 1-2 feet, for proper air circulation and heat exchange. Many units require a dedicated space for ventilation, either ducted into an existing system or through wall penetrations, while others are ductless.

Check the noise level specifications; quieter models are preferable for living areas. Verify that your home’s electrical system can handle the unit’s power requirements, typically a 240-volt connection.

Select ductless models for easier installation and prioritize units with lower decibel ratings for quieter operation.

Smart features and controls

Modern heat pump water heaters offer convenient smart features that enhance usability and efficiency. Look for models with WiFi connectivity and companion apps, allowing you to monitor and control your water heater remotely. Essential smart functions include programmable scheduling to heat water only when needed and vacation modes to conserve energy while you’re away.

Precise temperature adjustment controls, accurate to within a degree, ensure optimal comfort and efficiency. For enhanced convenience, choose units that integrate with existing smart home ecosystems.

Opt for Wi-Fi enabled units with programmable scheduling for maximum control and energy savings.

Which Should You Choose?

• If you want to eliminate wait times for hot water at every faucet and shower, choose a recirculation system with programmable timer and sensor valve.
• If you’re looking for significant energy savings and a whole-house solution for a medium-sized family, choose an 80-gallon Energy Star certified heat pump water heater.
• If you need a compact hot water solution for a single sink or small space, choose a 2.5-gallon electric mini-tank water heater.
• If you have a smaller household or need a more cost-effective option for a single bathroom, choose a 50-gallon Energy Star certified heat pump water heater.

Quick Best Heat Pump For Hot Water Buying Checklist

• Determine your household’s daily hot water demand to select an appropriately sized unit.
• Check the Uniform Energy Factor (UEF) to gauge the energy efficiency and potential savings.
• Consider the unit’s capacity and recovery rate to ensure it meets your peak usage needs.
• Evaluate installation space and clearance requirements for proper airflow and maintenance access.
• Look for noise level ratings, especially if the unit will be located near living areas.
• Assess smart features like app control and scheduling for convenience and optimized performance.

Frequently Asked Questions

What Is The Best Heat Pump For Hot Water For A Small Apartment?

For a small apartment, a heat pump for hot water with a capacity of around 30-50 gallons is typically sufficient. Look for models with a high Energy Factor (EF) to maximize efficiency in a limited space. Ensure the unit’s dimensions fit your installation area.

How Does Ambient Temperature Affect Heat Pump Water Heater Performance?

Ambient temperature significantly impacts the efficiency of a heat pump for hot water. Colder surrounding air means the unit needs to work harder to extract heat, potentially reducing its output and efficiency. Performance is generally best in warmer environments.

What Maintenance Is Required For A Heat Pump For Hot Water?

Regular maintenance for a heat pump for hot water includes cleaning air filters every few months to ensure optimal airflow. Periodically flushing the tank also helps prevent sediment buildup. Checking for refrigerant leaks is also recommended periodically by a professional.

Are Heat Pump Water Heaters Noisy?

Modern heat pumps for hot water are generally quieter than older models, but they do produce some operational noise from the compressor and fan. Look for units with decibel ratings below 50 dB for quieter performance. Proper installation can also mitigate noise.

What Is The Lifespan Of A Heat Pump For Hot Water?

The typical lifespan of a heat pump for hot water is between 10 to 15 years, similar to conventional electric or gas water heaters. Proper installation and regular maintenance, such as filter cleaning and tank flushing, can help extend the unit’s operational life.

Final Words

Investing in the best heat pump for hot water offers significant energy savings and environmental benefits. These advanced systems efficiently convert ambient air into hot water, reducing your utility bills and carbon footprint. Make the switch today to enjoy a sustainable and cost-effective hot water solution for years to come.