Heat pump indoor unit Mitsubishi Electric Ecodan with integrated boiler ERST20D-YM9E (200 litres)

Mitsubishi Electric Ecodan ERST20D-YM9E heat pump indoor unit with an integrated 200-liter boiler is a functional hydraulic module for air-to-water systems, designed for heating, cooling and domestic hot water production. The model is suitable for private houses, cottages, spacious residential properties, small commercial premises and buildings where stable comfort is required throughout the year.

ERST20D-YM9E is installed inside the building and operates together with a Mitsubishi Electric Ecodan outdoor unit. The outdoor unit uses heat from the outdoor air, while the indoor module distributes energy through the heating system and provides hot water production. This layout makes it possible to create a modern engineering system without the need to install a separate boiler.

Integrated 200-liter boiler

The indoor unit is equipped with an integrated 200-liter hot water tank. This volume is suitable for family use, several water draw-off points, the kitchen, shower, bathroom and daily household needs. The integrated design helps save space in the technical room and makes the system look neater.

The tank is made of stainless steel, resistant to corrosion. This increases equipment reliability and extends the service life of the module. The stainless steel tank is suitable for most water types and maintains stable operating characteristics over a long period of time.

Heat exchanger protection against scale

To improve reliability, the hydraulic module is equipped with a standard anti-scale filter. It limits limescale formation in the heat exchanger of the domestic hot water system. This is especially important for long-term operation, as scale can reduce heat exchange efficiency and increase the load on the equipment.

This protection helps maintain heat pump performance, reduce the risk of technical problems and extend the service life of the Mitsubishi Electric Ecodan indoor unit.

Three operating modes in one system

Mitsubishi Electric Ecodan ERST20D-YM9E provides three main modes: heating, cooling and domestic hot water production. Thanks to this, the system can be used all year round. In winter, it supports heating; in summer, it can operate for cooling through compatible water emitters; and hot water is available regardless of the season.

This versatility is especially convenient for modern homes where not just a heating appliance is needed, but a complete climate system with flexible settings and economical energy consumption.

Operation with different types of heating devices

The indoor unit can be used with radiators, underfloor heating, fan coils and fan-assisted convectors. This allows the system to be adapted to different projects: new energy-efficient houses, renovated buildings, properties with combined heating or rooms with different temperature requirements.

Support for two independent heating zones makes the system even more flexible. The temperature can be regulated separately on different floors, in living and sleeping areas, in bathrooms or technical zones. This approach improves comfort and avoids unnecessary energy consumption where intensive heating is not required.

High efficiency in the cold season

As part of a compatible Ecodan system, the outlet water temperature can reach up to 60°C at an outdoor temperature down to -3°C without a backup power source. Rated heating capacity is maintained in the range from +7°C to -3°C. Guaranteed system operation is possible at outdoor temperatures down to -25°C.

For cold weather, the outdoor unit defrosting process is provided. On average, it lasts no more than 10 minutes and helps maintain correct heat pump operation while minimizing the impact on thermal comfort inside the home.

Self-adaptive temperature control

The self-adaptive control mode analyzes actual heat gains and the building’s heating demand. The system takes into account solar radiation, the presence of people, accumulated heat in the rooms and other factors. Based on this data, the automation adjusts heat pump operation and maintains a comfortable temperature without unnecessary energy consumption.

The user can easily change the set temperature without dealing with complex heating curve settings. This makes system operation simpler and more convenient.

Remote control via MELCloud

When an additional Wi-Fi interface is connected, the system can be controlled remotely via MELCloud. Control is available from a smartphone, tablet or computer. It is possible to change modes, control temperature, check system status and manage the equipment from anywhere in the world.

For homes in Chisinau and Moldova, this is a convenient feature, especially if the property is not used permanently or the owner wants to prepare comfortable conditions in advance before arrival.

Convenient split-system installation

The Mitsubishi Electric Ecodan split system provides installation flexibility. The total length of refrigerant lines can reach up to 80 meters, making it easier to choose the location for the outdoor and indoor units. In this type of system, freeze protection is not required, making design simpler and more reliable.

Mitsubishi Electric Ecodan ERST20D-YM9E is a high-performance heat pump indoor unit with an integrated 200-liter boiler for properties where stable heating, hot water, reliability and modern control are important.