An innovative hot water production system utilizing waste heat from air conditioning and refrigeration, saving up to 20% in energy while reducing CO₂ emissions for sustainable renewable energy.
“Turn wasted heat
into hot water savings.”
A hot water production system that recovers waste energy from air conditioners. Ideal for high-demand businesses such as hotels, resorts, industrial plants, and wellness centers, it reduces energy waste and ensures long-term savings.
➢ Connects the air conditioning refrigerant circuit at the discharge line from the compressor (approx. 90-100°C) to the hot water tank.
➢ After heat exchange, the refrigerant flows back to the air conditioning system for normal cooling via the condenser. The produced hot water is stored in the tank for use.
➢ Heat from the refrigerant is transferred through the heat exchanger to the water in the tank, raising the water temperature up to 70°C.
“Frenergy utilizes waste heat from cooling systems to generate hot water, turning energy loss into cost savings.”
Hot water systems for guest rooms and kitchens.
Showers in swimming schools.
Hot water for patient rooms, spas, and fitness centers.
Food and beverage plants requiring continuous hot water.
“Previously, we hardly used the pool because the water was quite cold. But after installing the PAC Pooltemper, my children and I use the pool more often. We swim more frequently and have many more family activities together.”
“Previously, we used electric heaters for hot water in the guest rooms. Since the resort switched to PAC Frenergy, electricity consumption dropped from 880,000 kWh/year to only 171,000 kWh/year.”
“My Koh Chang Paradise Resort has used PAC Frenergy for over 10 years. Now that I have expanded to Koh Kood, I continue to choose PAC products, selecting the latest technology: PAC Hybrid Solar. It is a solar-powered VRF air conditioner that truly helps us save energy and electricity costs.”
“No more worries with PAC Pooltemper. The machine quality is excellent; no breakdowns or frequent repairs. It is perfect for our business.”
“At Khum Sameing, we have a Japanese-style Onsen in a Thai Lanna atmosphere, equipped with PAC Pooltemper which can reach water temperatures up to 50°C. In the guest rooms, we installed PAC Frenergy and PAC EcoAire, which have helped us save a lot of energy. Additionally, I chose PAC products for my IWRM water plant in Phan Thong, Chonburi. We are very satisfied with PAC's innovations.”
PAC is trusted by executives and leading corporate clients at over 500 locations nationwide.
Hospital and Healthcare Sector
Hotel and Accommodation Sector
Children's Swimming Academy Sector
Other Business Sectors
A: By modifying the air conditioning circuit to allow heat exchange between the refrigerant and water, the air conditioner works less, resulting in electricity savings.
A: The water can be used for domestic purposes such as showering, washing hair, cleaning dishes, and laundry. The tank is made of special grade Vitreous Enamel Coated Steel (DIN 4753), which is Food Grade. Since the water in the tank and the refrigerant system do not come into contact, there is no contamination or danger to users.
A: The heat recovery system itself does not use electricity, so these safety devices are not required. However, the optional 1.5 kW electric heater can be grounded to prevent electric shock or leakage. To prevent scalding, it is typically used with mixing faucets at various points to achieve the desired temperature. An additional thermostatic valve can also be installed to control the hot water temperature from the tank as needed.
A: 1,000-1,500 W, depending on the selection. The hot water tank can retain heat for approximately 3 days, though this varies based on the ambient temperature of the installation site.
A: No. In fact, the compressor performs better, consumes less current, and provides better cooling. It also extends the lifespan of the air conditioning unit.
A: Not necessarily. We usually recommend connecting it to 1-2 frequently used air conditioners to produce hot water continuously, though this depends on your specific usage.
A: It can produce hot water at 50-60°C without using electricity.
A: On average, it takes about 2 hours to reach 60°C. This depends on the size of both the air conditioner and the water heater. A high BTU air conditioner with a small tank will heat water quickly, while a low BTU unit with a large tank will take longer.
A: The PAC Frenergy heat recovery water heater can be equipped with a 1-1.5 kW backup electric heater to generate heat when the AC is off or not running at full capacity, such as during cold weather or illness. We recommend this installation to ensure a constant hot water supply. The impact on electricity costs is minimal since the primary heat source throughout the year is the AC, and a 1-1.5 kW heater consumes very little power.
