Samsung
The Samsung RC120MHXGA is a 12 kW monobloc air-source heat pump using R410A refrigerant, capable of delivering flow temperatures up to 70°C for domestic hot water.
The Samsung RC120MHXGA is a 12 kW monobloc air-to-water heat pump within the EHS Mono range. Introduced around 2011, this unit utilizes R410A refrigerant to provide domestic heating and hot water. It is designed for external installation, housing all hydraulic components within the outdoor chassis. With a maximum flow temperature of 70°C for domestic hot water, it supports high-temperature applications. This technical reference covers specifications, model variants, and installation requirements for UK heating professionals.
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Full technical specifications extracted from the manufacturer brochure. Empty sections are hidden.
The Samsung RC120MHXGA belongs to the EHS Mono product family, a series of monobloc air-source heat pumps designed for straightforward integration into UK domestic heating systems. As a monobloc unit, the RC120MHXGA contains the entire refrigerant circuit and hydraulic heat exchanger within the outdoor casing, requiring only water pipework connections to the internal heating circuit. This design eliminates the need for F-Gas qualified refrigerant pipework between the indoor and outdoor sections, though F-Gas certification remains necessary for servicing the sealed system.
This specific model provides a nominal output of 12 kW, making it suitable for medium-sized detached or semi-detached properties with moderate heat loss. The unit operates using R410A refrigerant, a common choice for systems of its era. One of the notable technical capabilities of the RC120MHXGA is its ability to reach a maximum flow temperature of 70°C, specifically when targeting domestic hot water setpoints. This high-temperature threshold allows for effective legionella cycles and compatibility with standard unvented cylinders, provided they are sized correctly for heat pump duty.
The RC120MHXGA is part of a broader range of model variants, including the RC090, RC140, and RC160, with outputs ranging from 9 kW to 16 kW. These variants share a similar architecture but differ in compressor capacity and physical scaling to meet varying building loads. Control is typically managed via a dedicated Wired Remote Controller, which allows installers to configure weather compensation curves and schedule heating cycles.
For operational reliability, the unit features an automatic defrost method to maintain evaporator efficiency during low ambient temperatures. It also includes a quiet mode, which can be activated to reduce sound emissions during night-time hours or in noise-sensitive locations. While the 2011-era documentation focuses on core performance, the unit requires registration to validate warranty terms. Installers should ensure the system is flushed and inhibited according to manufacturer guidelines to protect the internal plate heat exchanger. The RC120MHXGA represents a legacy generation of Samsung’s EHS technology, providing a high-temperature monobloc solution that remains in service across many UK installations.
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Specifications on this page are extracted from the manufacturer brochure. Always cross-check against the latest datasheet before commissioning or quoting. Last updated 30 April 2026.