EVI Heat Pump Technology | DC Inverter Air-to-Water

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Superior Air to Water Heat Pump Technology

Enhanced Vapor Injection technology is designed specifically for cold climates, delivering exceptional performance even in extremely low temperatures. This innovative feature ensures that your air to water heat pump technology operates efficiently and effectively, even in the harshest conditions.

What Is an EVI Heat Pump?

An EVI heat pump uses Enhanced Vapor Injection technology to improve heating capacity and efficiency in cold outdoor conditions. The system injects additional refrigerant vapour into the compressor during operation, helping the heat pump maintain more stable performance as ambient temperatures fall.

EVI technology is particularly useful in air-to-water heat pumps designed for colder climates, where heating demand increases at the same time that outdoor temperatures decrease. When combined with DC inverter control, it can help maintain reliable heating performance while adapting compressor output to actual demand.

Explore Tongyi’s R32 EVI Air-to-Water Heat Pump →

Enhanced Air to Water Heat Pump Technology

Utilizing a DC inverter boosts the efficiency of your heat pump’s operation. Research shows that the working efficiency of a DC inverter compressor outperforms an AC inverter compressor by 10% to 30%.

Additionally, EVI Technology enables the heat pump to absorb more heat from ambient air in colder conditions, ensuring consistent performance even in extreme temperatures as low as -25°C. This combination of technologies elevates the capabilities of air to water heat pump technology, delivering reliable heating and cooling in all conditions.

Advanced Air to Water Heat Pump Technology

Another advantage of DC inverters is their ability to reduce vibration, which in turn lowers noise levels. With adaptive intelligent torque compensation and vibration suppression technology, noise emissions are reduced by up to 5 dB(A), ensuring a quieter operation.

Take your expectations to the next level with EVI technology, which raises the bar by allowing the water outlet temperature to reach up to 60°C. This breakthrough opens up a whole new range of possibilities for meeting your heating needs with air to water heat pump technology.

DC INVERTER EVI

DC Inverter EVI Technology can effectively reduce power consumption and improve the heating capacity of heat pump units to ensure stable performance even at ambient temperatures as low as -25°C.

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COMPETITIVE ADVANTAGES

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Silence

Reaching as low as 35dB(A), Silent Mode creates a tranquil atmosphere.

IoT (Internet of Things)

IoT Technology facilitates the remote monitoring and analysis of the heat pump’s status.

Twin Rotary

A Twin Rotary DC Inverter compressor results in a 30% reduction in energy consumption compared to traditional scroll compressors.

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Smart Defrost

Tongyi has achieved the development of intelligent defrost processes, aimed at optimising the management of defrosting cycles in air-to-water heat pumps.

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24/7 Remote Service

Benefit from round-the-clock remote service support, ensuring assistance whenever you need it, day or night.

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R32 | R290

These two environmentally friendly refrigerants lead to a substantial decrease in Global Warming Potential (GWP) and carbon emissions.

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Lead Time

Experience rapid deliveries with our swift lead time service, ensuring your needs are met promptly and efficiently.

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Silence

Reaching as low as 35dB(A), Silent Mode creates a tranquil atmosphere.

IoT (Internet of Things)

IoT Technology facilitates the remote monitoring and analysis of the heat pump’s status.

Twin Rotary

A Twin Rotary DC Inverter compressor results in a 30% reduction in energy consumption compared to traditional scroll compressors.

Know more

Smart Defrost

Tongyi has achieved the development of intelligent defrost processes, aimed at optimising the management of defrosting cycles in air-to-water heat pumps.

Know More

24/7 Remote Service

Benefit from round-the-clock remote service support, ensuring assistance whenever you need it, day or night.

Know More

R32 | R290

These two environmentally friendly refrigerants lead to a substantial decrease in Global Warming Potential (GWP) and carbon emissions.

Know More

Lead Time

Experience rapid deliveries with our swift lead time service, ensuring your needs are met promptly and efficiently.

Know More

Smart Control • Wifi

Experience a unique convenience with Tongyi Heat Pump’s smart control feature.

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NEWS & EVENTS

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NEWS

Welcome to Tongyi’s blog! We specialize in Air-to-Water heat pumps. Stay updated on HVAC and renewable energy innovations and join us in creating a greener future.

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EVENTS

Discover our participation in past exhibitions and save the date for future events to discover the potential of sustainable solutions to contribute to a brighter future.

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Asia Europe Knowledge

September 18, 2026

Do Heat Pumps Need a Buffer Tank? When It Helps — and When It Doesn’t

When planning an air-to-water heat pump system, one question appears again and again: Do heat pumps need a buffer tank? The answer is not always yes. A buffer tank can…

Tongyi

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Europe Knowledge

September 11, 2026

Why Heat Pump Efficiency Changes in Cold Weather: COP, Capacity and R290 Explained

Air-to-water heat pumps extract heat from outdoor air and transfer it into a home's heating system. That process works even when the temperature outside falls below freezing. However, heat pump…

Tongyi

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Europe Knowledge

September 4, 2026

How Quiet Is an R290 Heat Pump? Understanding Heat Pump Noise

Modern air-to-water heat pumps are designed to operate quietly. However, noise is still an important factor when choosing and positioning an outdoor unit. This matters especially in residential areas. A…

Tongyi

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SIZING QUESTIONNAIRE

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SUSTAINABILITY

Air-to-Water Heat Pump Leveraging the Power of Renewable Energy (Energy Management System)

Discover how our sustainable heat pumps' Energy Management System integrates with other renewable home appliances

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As a distinguished national high-tech enterprise, Tongyi Heat Pump is dedicated to the research, development, and manufacturing of air-to-water heat pumps, providing residential and commercial renewable energy-saving solutions to thousands of clients worldwide.