DROPS M 4.2 – 4.1 kW Domestic Hot Water Heat Pump

Main Features

• Energy efficiency class A.
• COP 4.2 (according to detailed data in the technical table below).
• Manufactured in Poland.
• Full manufacturer warranty and post-warranty service.
• Low operating costs and long service life thanks to high-quality components.
• No hidden extra costs – all components needed for the heat pump operation are built into the unit.
• Can be connected to any DHW tank – directly to the water circuit or via a water jacket or tank coil.
• Replacing the heat pump does not require dismantling the tank, unlike permanently integrated systems.
• Suitable for rooms with low ceilings where pumps with built-in tanks cannot be used.
• Easy and quick installation thanks to compact design and built-in circulation pump.
• Easy transport, high thermal insulation, and modern appearance thanks to lightweight and durable plastic casing.
• High safety level thanks to pressure and temperature protection in the refrigeration circuit.
• Automatic evaporator defrost function as standard.
• Ability to set four time intervals (two night and two day) with different water temperatures for each day of the week.
• Compatible with photovoltaic installation or day/night tariff power supply via an additional potential-free contact to start the pump.
• Ability to control an electric heater.
• Ability to control a DHW circulation pump.
• Installation on the floor (mounting feet included) or on the wall with an additional bracket (bracket not included).
• Can be installed and maintain warranty without special installer qualifications.
• Can cool rooms with exhaust air from the pump.

Main Components

• High-efficiency rotary compressor with long service life.
• Energy-saving EBM PAPST radial fan.
• Evaporator with hydrophilic coating improving defrosting and reducing fin contamination.
• WILO circulation pump for domestic or heating water.
• Intuitive controller.
• SWEP plate heat exchanger (condenser).
• Plastic casing in grey color.
• Mounting feet for floor installation.

Basic Technical Data

Parameters at 20 °C air temperature

The above parameters are based on tests with the unit connected to the tank according to diagram No. 2, with inlet air temperature of 20 °C and without additional ducts connected to the pump.

Important Notes

• During water heating, the temperature difference between the supply and return of the heat pump is only a few °C – this is normal and results from the operating characteristics of such devices.
• Connection via a coil reduces efficiency due to heat losses. The required coil surface area is min. 0.9 m² for proper operation.
• When using a coil or water jacket, the maximum water temperature may be slightly lower than the value given in the technical data (+60 °C).
• When connecting directly to the tank (diagram 2), the supply pipe should be placed as low as possible in the tank to shorten reheating time after a small hot water draw.
• When selecting tank capacity, take into account heating times for the given inlet air temperatures to avoid user discomfort or the need for an additional heat source.