10 Best Heat Pump Water Heater of December 2025

• CONVENIENT HOT WATER HEATER: 7 gallon point-of-use mini-tank fits under your sink to provide hot water right where you need it. Thermal efficiency is 98%. Dimensions : 17.5 W x 17.5 H x 14.5 D Inches
• INSTALLED VERTICALLY OR HORIZONTALLY: This larger model can be mounted vertically (7 gal. of water supply) or horizontally (5.1 gal. of water supply)- vertical orientation is installed with the cold and hot lines on top of the unit
• RELIABLE WATER SOURCE: Easily hard-wire the 7-gallon model to provide the on-demand reliable water source your home or office needs
• IMPORTANT INFORMATION: Heating capacity of 1440 watts and a temperature range of 65-145°F max. Operating pressure-150 psi. Water fittings-3/4 inch Male NPT. Electrical requirements (Amp 12A/Volts 120)
• EASILY MOUNTED: Can be shelf, wall or floor mounted (bracket included for vertical orientation only); simply tap into the cold water line and install the water heater directly at the sink to provide hot water

Bosch Thermotechnology

• CONTINUOUS FLOW – Advanced Flow Control German patented technology invented by Stiebel Eltron, automatically maintains water temperature for constant comfort. It’ll reduce flow slightly if hot water demand exceeds capacity. Hot showers will never be interrupted again.
• SPACE & ENERGY SAVER – Its small, sleek white design saves space yet still provides endless hot water for your whole house, and no venting is required. Eco friendly unit saves energy with auto-modulation and the ability to electronically measure water flow. Savings monitor even shows how much you save on energy costs.
• EASY OPERATION – Electronic flow sensor switches on the powerful solid copper interior heating system of the water heater. It’s noise free while in use and has a digital temperature display and preset temperature memory buttons.
• TEMPRA 15 PLUS – This specific model is 14.4kW, 240V/208V, requires a min recommended household electric service of 100 A, and offers an output water temperature of 86˚ to 140˚F. Check our guides below to compare features of our various Trend and Plus models, each available in different kW levels.
• WARRANTIES INCLUDED – Stiebel Eltron’s top-rated electric tankless water heaters perform with the highest standards for comfort and reliability. Our 7-Year Leakage and 3-Year Parts Warranties are included with purchase.

Stiebel Eltron

• Digital temperature control. Voltage : 240 Volt or 208 Volt
• Proven reliability
• No venting required
• Sleek design fits anywhere
• Save at least 15-20% on the hot water portion of your electric bill

Stiebel Eltron

• COMFORT: Thermostatic mixing valve increases usable hot water on existing water heaters and new NAECA compliant water heaters
• PROTECTION: Controls hot water to prevent injury from scalding when showering, bathing or washing by ensuring water is delivered at a safe temperature to all fixtures
• SAFETY: Reduces the risk of Legionella bacteria growth by enabling hot water to be stored at a germ killing 140 degrees Fahrenheit (60 degrees C), while ensuring that water is delivered at a safe temperature to outlets
• COST EFFECTIVE: Adding a Tank Booster Pro Thermostatic Mixing Valve to an existing water heater allows water to be stored at a higher temperature
• SHARKBITE: Use with SharkBite Flexible Water Heater Connectors and Ball Valves for easy installation in systems using copper, CPVC or PEX tubing

Cash Acme

• Can provide hot water for one sink at 0.5 GPM in warmer climates
• Requires 1 x 30 amp breaker and 10 AWG wire
• For one sink at 0.5 GPM in colder climates the POU 6 is recommended
• Amperage Draw 29 amp. kW - 3.5 kW
• Connection Fittings 1/2" NPT

Ecosmart

• Lifetime warranty
• Save up to 60-percent on your water heating cost with an ECOSMART electric tankless water heater
• Never run out of hot water with an ECOSMART tankless water heater
• Patented Self Modulating Technology and design
• ECOSMART tankless water heaters are 99.8-percent energy efficient.Uniform Energy Factor:0.98

Ecosmart

• WATTS RECIRCULATING HOT WATER PUMP: Provides hot water at every faucet or shower when needed, eliminating wasted water, 0.5 inches bypass value.
• BEST SELLING RECIRCULATING SYSTEM: Conserve up to 15,000 gallons of water per year. Save up to 10% of your water bill. It costs only $0.05 per day to operate.
• EASY INSTALLATION: Install in less than 1 hour. This unique product easily connects to existing plumbing and is maintenance-free.
• WATTS HOT WATER RECIRCULATING SYSTEM: The kit includes a pump with timer, 2 adapters with rubber washers, valve mounting screws, sensor valve, and two 12-inch supply lines.
• RECIRCULATING PUMP WITH TIMER: 24-hour programmable timer activates pump when you need it. No vibrations: it’s extremely quiet compared to other systems in the market. Do not use with tankless water heaters. Insert the 115V plug on the line cord from the pump into a properly grounded 115V outlet.

Watts Premier

• Energy Star Qualified
• Reduce water heating costs up to 73% compared to a standard electric water heater
• Dual Voltage Capable
• Select from Efficiency, Hybrid, or Electric modes to match heating requirements to environmental conditions and hot water demand
• Vacation mode reduces operating costs and provides freeze protection

AO Smith

• Savings of up to 50% on water heating costs. Dimensions :17H x 17W x 3.625D inches ;Pipes fittings :3/4 inch NPT
• Digital temperature control in 1-degree increments allows control of hot water; Activation Flow: 0.3 GPM
• Copper and stainless components designed for efficiency, durability and easy replacement.
• Compact size saves valuable storage space, while the stylish and advanced design is pleasing to the eye and Copper and stainless components designed for efficiency, durability and easy replacement.
• Prior to purchase & installation, please verify that this model is the right size for your hot water needs and electrical requirements. Electrical requirements: 27 kW, 240 volts, (3) 40 required breakers, 112.5 maximum power (AMP), (3) 8 required wire.Amperage Draw:113 A
• Required Breaker Quantity: Three 40 Amp Double Pole
• Recommended Electrical Panel: 200 Amps
• NEVER run out of hot water with an ECOSMART tankless water heater.
• Save up to 12 cubic feet of storage space.
• Digital temperature control in 1-degree increments gives users complete control of hot water

Ecosmart

• INDOOR installation only. Fuel Type: NATURAL GAS.
• Concentric or PVC venting option
• Up to 0.96 Energy Factor/Up to 0.92 Uniform Energy Factor
• The space-saving design allows Indoor Installation type
• Ultra low NOx emissions
• 199,000 max BTU

Rinnai