Japanese heating system manufacturer Daikin has launched two new propane (R-290) heat pump product lines for applications in industrial buildings and district heating.
The EWA/YK-CZ is an air-to-water reversible heat pump built around inverter-driven scroll compressor technology enhanced with vapor injection — a configuration that, the manufacturer said, maximizes heat output while maintaining efficiency even under partial-load conditions.
With a nominal capacity range of 20 kW to 85 kW and the ability to deliver water temperatures of up to 75 C, the unit is designed to step into traditional boiler roles in existing plant rooms, supplying heat compatible with older radiator systems or industrial processes. Its compact monobloc format is intended to simplify logistics and installation, from retrofit scenarios in city centres to integration into new commercial buildings, while optional configurations, such as integrated pumps and multiple refrigerant circuits, broaden its applicability.
The product also incorporates integrated safety features and inverter control that dynamically adapts to load demand, minimizing cycling losses and enhancing part-load efficiency. These features can contribute to longer service life, according to the company.
As for the EWYK-QZ, it is described as a modular air-to-water reversible heat pump built around a 135 kW base module. The system can be configured with up to four modules per array, delivering up to 500 kW per array, while grouped configurations allow capacities of up to 2 MW. This multi-layer scalability reflects growing market demand for flexible, high-capacity heating systems, the manufacturer said.
The unit combines inverter-driven scroll compressors with electronically commutated (EC) brushless fans to ensure precise modulation across a wide operating range. Full inverter technology enables high seasonal efficiency and stable part-load performance, which is a critical factor in real-world installations, where systems rarely operate at full output. By continuously adapting to demand, the EWYK-QZ aims to reduce cycling losses while maintaining consistent thermal delivery, according to Daikin.
The system can deliver heating water temperatures of up to 75 C, making it suitable for boiler-replacement scenarios or high-temperature process applications. On the cooling side, it can supply water temperatures down to –15 C.
The product features a plug-and-play modular concept, with modules combined within arrays and managed in grouped configurations. This approach enables staged deployment and future expansion without re-engineering the entire system. Reduced system water content is designed to improve responsiveness and ensure stable long-term heating performance, while optimized defrost logic for multi-unit installations helps maintain efficiency during cold-weather operation, Daikin said.
The EWYK-QZ also includes dedicated extraction fans for the unit and switchbox, refrigerant leak detectors in the compressor and switchbox compartments, and visual and audible alarms. Safety components are supported by a dedicated electrical supply, ensuring operational integrity under all conditions.
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I have a commercial building ans I need heat.