Samsung
The Samsung RC120MHXEA is a 12kW monobloc air-source heat pump using R410A refrigerant, capable of delivering flow temperatures up to 70°C for heating and hot water.
The Samsung RC120MHXEA is a 12kW monobloc air-to-water heat pump, part of the EHS Mono product family introduced in 2011. This unit utilizes R410A refrigerant and is designed for domestic heating and hot water applications. Per the manufacturer documentation, the system can achieve a maximum flow temperature of 70°C for domestic hot water cycles. It is typically paired with a wired remote controller for operation and features an integrated auto-defrost method for cold weather performance.
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Full technical specifications extracted from the manufacturer brochure. Empty sections are hidden.
The Samsung RC120MHXEA belongs to the EHS Mono range, a series of monobloc air-source heat pumps designed to provide low-carbon heating for UK homes. As a monobloc system, the refrigerant circuit is entirely contained within the outdoor unit, simplifying the installation process by requiring only hydraulic connections to the property's heating system. This specific model provides a nominal capacity of 12kW, making it suitable for medium-to-large detached or semi-detached properties with moderate heat loss profiles.
The appliance utilizes R410A refrigerant, a common choice for systems of its era. While newer models have transitioned to R32 or R290, the RC120MHXEA remains a functional part of the Samsung legacy fleet. According to the control unit documentation, the system is capable of reaching a maximum flow temperature of 70°C, which is particularly relevant for domestic hot water (DHW) sterilization cycles and meeting the requirements of older radiator systems.
Control is managed via a dedicated wired remote controller. This interface allows users and engineers to set operation modes, including a quiet mode that reduces sound emissions during sensitive periods. The unit also features an automatic defrost cycle to maintain efficiency when outdoor temperatures drop, preventing ice build-up on the evaporator coils. For engineers, the RC120MHXEA is part of a wider family of variants, including the 9kW, 14kW, and 16kW models (RC090MHXEA to RC160MHXEA). These units share similar control logic and installation requirements. When servicing or diagnosing these units, it is important to note that technical data is often split between the outdoor unit's service manual and the control unit's operational guide.
System design for the RC120MHXEA should account for the 12kW output at standard design conditions. Installers must ensure that the hydraulic circuit can maintain the required water flow rates and that any necessary buffer tanks or volumisers are sized correctly to prevent short-cycling. While specific SCOP and ERP data for this 2011-era model are less readily available in the quick-start documentation, the unit's performance is governed by its inverter-driven compressor and weather compensation capabilities, which adjust the flow temperature based on external ambient conditions.
Common questions from engineers and homeowners about the Samsung Air to Water Heat Pump - Mono Control Unit.
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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.