Sales Department Air-Conditioning & Refrigeration Division Air-Conditioning & Refrigeration Quality Assurance Department Quality Management Division Machinery, Equipment & Infrastructure
In recent years as part of global warming prevention, heat pump hot water supply systems,
which are highly efficient and emit less CO2, are attracting attention as an alternative to boiler
systems in which natural gas, heavy oils or kerosene is used. The ESA30-25 CO2 refrigerant heat
pump water heater of Mitsubishi Heavy Industries, Ltd (MHI) has achieved the industry's highest
COP of 4.3 and maintains 30 kW output at ambient temperatures of up to -7°C. Even in extremely
cold regions where the ambient temperature may reach -25°C, it can discharge hot water of 90°C,
thus exhibiting performance superior to the products of our competitors. However, because the CO2
refrigerant heat pump water heater involves a large high/low pressure difference and contains a
water circuit, etc., regular maintenance inspections (e.g., regarding blockages or leaks in the circuit
or a decline in performance) are required. The 24-hour remote monitoring system, which is
introduced in this report, enables the accurate, prompt and timely provision of these maintenance
services to our customers, as well as proposals for more economical ways of using the water
heaters (energy-saving operation). It therefore assists customers with the long and stable use of our
water heater products.
