HRW heat exchangers are refrigerant free and use no compressor. This energy efficient design saves further by using an inverter pump for demand-based rotation control. Four models offer cooling capacities from 2 to 30 kW. The HRW is rated for high performance temperature stability of ±0.3°C through a set range of 20 to 90°C. The operation panel includes an input keypad and multi-line LCD display