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Hydron-Aire EVI Air-to-Water Heat Pump

Air-Source Heat Pump Water Heater

Hydron-Aire EVI Air-to-Water Heat Pumps

The Hydron-Aire EVI Air to Water Heat Pump is the most efficient air source solution on the market today. It has approximately 3 to 4 times greater thermal efficiency than natural gas and uses innovative hydronic technology to supply energy to your home, including:

• Both heating and cooling; no need for a separate air conditioning unit
• Radiant floor heating and cooling
• Domestic hot water

Commercial ✔Residential ✔
New builds ✔Retrofits ✔
Monoblock ✔Split
Big ✔Small
Cooling ✔Heating ✔
Cold Climate ✔Hot Climate ✔


How air-to-water heat pump systems work?

Hydron-Aire EVI air-to-water heat pump

An air-to-water heat pump is a piece of mechanical equipment that extracts thermal energy from the air and uses it to heat or cool water.

An air-source heat pump system works by concentrating and transferring thermal energy between the outside air and indoor space. For example, when providing hot air to the indoor space, a fan draws air through the heat pump’s evaporator, which is situated in the outdoor heat pump. The thermal energy in the air is transferred to a refrigerant, which changes its physical state and evaporates even at low temperatures, absorbing the energy. The heat pump compressor increases the pressure of that refrigerant and then feeds this now energy-dense refrigerant into the heat pump condenser, which transfers the thermal energy into a water and glycol mixture. This hot fluid is pumped through pipes into the indoor space and used to heat radiant floors, warm air, or domestic water.

Heat pumps are a proven technology

Heat pumps are a proven technology that has been used for decades, both in Canada and globally, to efficiently provide heating, cooling, and hot water to buildings.

EVI Air-to-Water Heat Pumps are the most efficient air source solution on the market today, with approximately 3 to 4 times greater thermal efficiency than natural gas. Additionally, EVI’s record-breaking low operating ambient temperature range (down to -30 degrees C) means less reliance on all electric and gas backup sources.

PLUS, Wi-Fi-enabled controls and thermostats allow you to monitor and adjust the system from anywhere.

heat pump benefits
Hydron-Aire EVI

Enhanced Vapour Injection (EVI) and Air-to-Water Heat Pump Benefits

Discover the benefits of EVI heat pump technology. EVI is a technology used on our cold-climate heat pumps to achieve higher performance at lower temperatures. An EVI heat pump uses a third, smaller internal plate heat exchanger called an “Economizer” within the refrigeration cycle to provide optimal refrigerant pressures and temperatures to a twin-inlet compressor. These features allow the heat pump to efficiently and reliably extract energy from much colder air than standard heat pumps.

With the right control system, multiple comfort zones can be serviced within a home or building.

Heat pumps are a proven, environmentally friendly technology that saves energy and money. However, traditional air-to-air and air-to-water heat pumps cannot efficiently extract energy from winter air conditions. When you need the most heating, they give you the least and at their worst efficiency. That’s where Hydron-Aire EVI steps in!

EVI technology allows our air-to-water heat pumps to maintain high efficiency and capacity down to -30 °C air temperatures.

In addition, one of air-to-water heat pump benefits is to heat domestic water. A dedicated heat exchanger or hot water tank with a built-in heat exchanger is used to transfer heat from the heat pump system to heat domestic hot water. We even offer specific models for pools and hot tubs.

How Does EVI Work?

The EVI technology, known for its heat pump benefits, allows for efficient operation at much lower outdoor temperatures than standard heat pumps. To do this, it utilizes a refrigeration compressor with two suction inlets instead of one. In low temperatures, a portion of refrigerant gas is reinjected into the second compressor connection to lower the total pressure difference the compressor must work against. The compressor is then sped up to do the same total work, thus maintaining heating capacity.

These graphs illustrate the heat pump running at a cold temperature and the efficiency it achieves:

Efficiency of pump at temperatures below -20C
Efficiency of pump at temperatures below -20C

To illustrate the benefits, we can compare a air-to-water heat pump to a vehicle. For example, a truck may be used to pull a load of material up a hill. The heavier the load you want to move up the hill, the more powerful the engine you need. But the more powerful engine will take more energy to operate, even when the extra power is not needed. Ideally, when the hill is steep, you simply reduce the amount you pull but make more trips to get the job done. Then you can drive a truck with a smaller and more efficient engine year-round, saving you money.

An air-to-water heat pump does the same thing by moving heat energy from a low-temperature location to a higher-temperature location. The heat pump compressor has to be sized to operate efficiently during low-load conditions. But when the difference between the outdoor and indoor temperatures is high, traditional heat pump compressors will have insufficient power to get the job done. EVI technology allows the compressor to pull less energy up the hill per cycle and work faster, thus maintaining heat output.

Hydron-Aire EVI air-to-water heat pump advantages and benefits

Hydron-Aire EVI Air-to-Water Heat Pumps are the solution to:

  • RISING ENERGY COSTS: EVI captures energy from the air, saving up to 40% when compared with traditional heating and cooling systems.
  • RELIANCE ON FOSSIL FUELS: EVI eliminates the need for fossil fuels.
  • UNSTABLE TEMPERATURES: With variable-speed technology, EVI heat pumps run at more consistent intervals, eliminating uneven temperatures throughout the space while also providing increased air filtration.

GOVERNMENT INCENTIVES: Check with your local provincial and municipal government as well as energy providers to see what incentives may be available in your area. We cover provincial rebates in our news section as well!

ELECTRIC BACKUP AVAILABLE: You can choose to have an electric form of backup heat, depending on what type of system you have. For example, our thermal storage tank comes with 12kw of backup heating elements to keep the water hot in case the air-to-water heat pump stops operating. If you have an air handling unit for air distribution, you may also add in an electric backup heater to keep the air hot.

QUIET OPERATION: The outdoor air-to-water heat pump can range from approximately 43 dB to 48 dB, depending on the size of the heat pump.

DEFROST CYCLE: A defrost cycle removes the frost from the outdoor coil. Frost conditions will occur when the coil temperature is lower than the dew point of the outdoor ambient air. The defrost cycle should be long enough to melt the ice, but short enough to be energy efficient. The defrost cycle on our air-to-water heat pumps lasts only a few minutes because we can use the stored heat of the water in the storage tank to accelerate the process. Because of this stored energy, the system’s efficiency is improved compared to traditional outdoor heat pumps.

PROUDLY TÜV RHEINLAND CERTIFIED: We are certified by TÜV Rheinland, which stands for safety and quality in virtually all areas of business and life. Founded almost 150 years ago, the company is one of the world’s leading testing service providers.

5-YEAR WARRANTY: Our air-to-water heat pump comes with a 5-year parts warranty.


There are a few different air-to-water heat pump system configurations a homeowner could choose from, but typically you would expect to have the outdoor air-to-water heat pump, water circulation pumps, storage tanks, and a control system or thermostat. If there is a forced air component to the system, then an air handler would be required as well. Basic heating and cooling applications can make use of a simple onboard control or remote mounted thermostat, while multizone systems use a central zone controller with remote thermostats in each zone.

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