Lithuania-based Refra has launched its Oasis range of water-to-water heat pumps and chillers, with capacities from 34 kW to 600 kW for small to large commercial and industrial applications. With propane refrigerant, inverter-driven compressors and a modular multi-circuit design, the units can achieve a coefficient of performance of up to 5.1.
Lithuania-based refrigeration and HVACR equipment manufacturer Refra has launched a water-to-water heat pump for medium-capacity commercial and industrial applications that require improved reliability and operational flexibility.
“With heating capacities from 112 kW to 303 kW and cooling capacities from 90 kW to 238 kW, the unit is ideally suited for office buildings, hotels, hospitals, larger residential complexes and industrial facilities with variable or continuous thermal demand,” the company said in a statement. “The Oasis series also offers advanced control and efficiency options, including inverter technology for variable compressor speed control. This enables precise capacity modulation, improved part-load efficiency and reduced mechanical stress on system components.”
The new heat pumps use propane (R290) as a refrigerant and employ reciprocating compressors, brazed plate heat exchangers (BPHEs) and ventilated housings equipped with monitored leak detectors to meet EN 378 safety standards, the manufacturer said.
The new product series is available in three versions.
The Oasis Solo is a compact heat pump and chiller, with heating capacities from approximately 34 kW to 151 kW and cooling capacities from approximately 26 kW to 119 kW. It is ideally suited to small to medium sized commercial buildings including offices, retail spaces and residential blocks. The coefficient of performance (COP) is between 4.67 and 5.10 and the seasonal COP (SCOP) is between 4.41 and 5.05. On the cooling side, the energy efficiency ratio (EER) ranges from 3.67 to 4.11, with a seasonal EER (SEER) from 5.92 to 7.18. The dimensions for most models are 1,360 mm × 915 mm × 1,885 mm and the weight ranges from 470 kg to 685 kg.
The Oasis Twin offers medium capacity performance, dual compressors and phasing flexibility, making it a good choice for hotels, hospitals and larger residential installations, the company said. The heating power ranges from 150 kW to 300 kW, while the cooling power ranges from approximately 120 kW to 250 kW. The device delivers a COP between 4.5 and 5.0 and a SCOP of roughly 4.2 to 4.8. On the cooling side, the EER ranges from 3.5 to 4.0, with a SEER from 5.8 to 6.8. The Oasis Twin units are slightly larger than the Solo models, typically measuring 1,800mm by 1,000mm by 2,000mm and weighing between 650kg and 950kg depending on configuration.
The Oasis Tribus is a high capacity heat pump and chiller designed for large commercial and industrial facilities with significant thermal demands. Heating capacities typically range from approximately 300 kW to 600 kW, with cooling capacities from 250 kW to 500 kW depending on configuration. The unit maintains strong efficiency over the full load range, with a COP of 4.3-4.8 and a SCOP of approximately 4.0-4.5. Cooling performance is also robust, with an EER of 3.4-3.9 and a SEER ranging from 5.5-6.5.
All units are designed with brazed plate heat exchangers, robust compressors and a modular multi-circuit architecture to ensure reliability, redundancy and precise load matching. Additionally, they rely on hydronic integration, with standard water connections, and feature energy-efficient operation with strong seasonal COP and SEER performance.
Electrical requirements are generally three-phase 400 V, 50 Hz, with each unit also integrating safety and monitoring functions that comply with EN 378 standards, including leak detection and protective enclosures. Acoustic optimization is included in all models, reducing operational noise while maintaining compact and usable designs suitable for commercial and industrial installations, according to the manufacturer.
“Oasis units are typically supplied as water-to-water chillers for cooling or as water-to-water heat pumps for heating, depending on project requirements. However, in a dual-function configuration, the unit can provide both heating and cooling capacities within the same system,” the company said.
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