Heat pump water heater – TECHNICAL INFORMATION FOR INSTALLERS
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1.7 Identification of the appliance
The main information for identifying the appliance is contained on the adhesive data plate located on the water heater
casing.
Internal unit 35isuali label
power supply voltage. Frequency. Maximum
absorbed power
max./min. Pressure of the refrigeration circuit
absorbed power – heating element mode
max./min. Power in heat pump mode
type of refrigerant and charge
global warming potential / Quantity of fluorinated
greenhouse gases
External unit 35isuali label
Type/quantity of refrigerant
Design pressure of the circuit
2. TECHNICAL FEATURES
2.1 Operating principle
The heat pump water heater does not directly heat water using electrical energy, but makes a more rational use of the
latter to obtain the same result in a more efficient manner, namely by consuming approx. 2/3 less water.
The efficiency of a heat pump cycle is measured by the Coefficient of Performance (COP), i.e. the ratio between the
energy supplied to the appliance (in this case, the heat transferred to the water to be heated) and the electrical energy
used (by the compressor and the appliance’s auxiliary devices). The COP varies according to the type of heat pump
and to its relative conditions of operation.
For example, a COP value equal to 3 indicates that for every 1 kWh of electrical energy used, the heat pump supplies
3 kWh of heat to the medium to be heated, of which 2 kWh are extracted from the free source.
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