Japanese heating system manufacturer Daikin has unveiled a new series of residential air-to-air heat pumps that it says are particularly suitable for highly insulated, airtight homes, where heating and cooling loads can remain low for extended periods once the desired indoor temperature has been reached.
The systems use R32 as the refrigerant, which has a global warming potential (GWP) of 675, and rely on a “small-capacity, high-efficiency compressor” that can reportedly maintain efficient operation under low-load conditions, reducing the energy losses associated with frequent compressor cycling.
Initially launched in the Japanese market, the Ururu Sarara X heat pump line comprises nine models for rooms ranging from six to 26 tatami mats, a Japanese unit of floor area, corresponding to approximately 10 m² to 43 m². Five models operate with a single-phase 100 V power supply and five are available with a 200 V connection, with the 4.0 kW capacity class offered in both configurations.
The manufacturer said the new compressor is particularly suited for spaces where indoor temperatures are less affected by outdoor conditions and the units consequently spend longer periods operating at low output. According to Daikin, the technology can also contribute to meeting the energy-performance requirements of Japan’s GX-oriented and zero-energy home (ZEH) standards.
The heat pumps also feature a new outdoor-temperature-dependent “Heat Boost Control.” The function is activated when outdoor temperatures fall to 2 C or below and increases both heating capacity and airflow.
Daikin said the technology can reduce the time required to reach the set temperature by around 20% compared with its previous-generation system. In tests conducted by the manufacturer with a 4.0 kW model, the system raised the indoor temperature from 10 C to a setpoint of 22 C in approximately 14 minutes at an outdoor temperature of 2 C, compared with around 18 minutes for the previous model.
The company also said the increased airflow expands the floor area reaching temperatures of at least 22 C by approximately 1.2 times compared with the previous-generation system under its specified test conditions.
For cooling operation, Daikin has introduced a low-airflow sleep mode designed to reduce discomfort caused by drafts during the night. In the 2.2 kW to 2.8 kW models, the manufacturer said operating noise remains at 35 dB(A) or below when the function is activated.
Daikin said the Ururu Sarara X range also combines heating and cooling with humidification, dehumidification, ventilation and air purification functions, without providing further technical details.
For comparison, the previous Ururu Sarara X generation has nominal heating capacities ranging from 2.5 kW to 10.6 kW and nominal cooling capacities ranging from 2.2 kW to 9.0 kW. Depending on the model, heating output can reach up to 12.4 kW, while maximum cooling output reaches 9.1 kW.
The indoor units measure 798 mm × 295 mm × 370 mm, while the size and weight of the outdoor units vary according to capacity, from 795 mm × 713 mm × 300 mm to 850 mm × 849 mm × 320 mm.
“With the launch of the 2027 models, we aim to contribute to comfortable living and energy savings by enhancing energy efficiency and comfort in response to changes in housing performance and lifestyles,” Daikin said in a statement,
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