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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.

CERTIFICATIONS
COMPETITIVE ADVANTAGES

Discover the unique advantages that set us apart.

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.

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.

24/7 Remote Service

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

R32 | R290

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

Lead Time

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

Smart Control • Wifi

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

NEWS & EVENTS

Stay connected with our latest news and upcoming events.

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.

Visit our Blog
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.

Discover past & Upcoming Events
EuropeKnowledgeHeat Pump Radiator Sizing: Do Existing Radiators Need Replacing?
October 9, 2026

Heat Pump Radiator Sizing: Do Existing Radiators Need Replacing?

When replacing a gas or oil boiler with an air-to-water heat pump, one question appears almost immediately: Do all the radiators need to be replaced? Not necessarily. Some existing radiators…
EuropeKnowledgeHigh-Temperature R290 Heat Pumps: What 35°C, 55°C, 65°C and 75°C Really Mean
September 25, 2026

High-Temperature R290 Heat Pumps: What 35°C, 55°C, 65°C and 75°C Really Mean

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