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The EVI System

EVI Air to Water heat pumps can be used to:

  • Efficiently heat homes in colder climates
  • Provide multiple comfort zones within a home or building
  • Radiant floor heating
  • Heat domestic in-home water
  • Heat private pools or hot tubs

EVI stands for “Enhanced Vapor Injection” and is a technology used on our cold climate heat pumps to achieve higher performance at lower temperatures.

An EVI heat pump uses a 3rd 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.

In addition, an air to water heat pump can be used 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.

Our air to water heat pump can operate down to outdoor ambient temperatures of -30 C (-22 F).

EVU Buffer Tank
EVI Buffer Tank

air to water heat pump systems

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 heat 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 pumps compressor increases the pressure of that refrigerant and then feeds this now energy-dense refrigerant into the heat pumps 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 and or heat domestic water.

Hydron-Aire logo
Hydron-aire products selection

Hydron-Aire is the leading distributor of high-efficiency heating and cooling systems in Western Canada.

With offices in the Winnipeg and Vancouver areas, we distribute both residential and commercial equipment in select territories.


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