Alpha
The Alpha E-Tec EHP is a 4 kW external monobloc hybrid heat pump using R32 refrigerant, designed for UK homes and capable of operating down to -5°C.
The Alpha E-Tec EHP is an external monobloc air-source heat pump designed for integration into hybrid heating systems. This appliance, with a nominal capacity of 4 kW, is specifically engineered to pair with an indoor gas boiler, offering a flexible solution for UK domestic heating. This page provides essential technical specifications, installation guidelines, and service procedures for heating engineers, alongside key information for homeowners researching hybrid heat pump technology.
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Full technical specifications extracted from the manufacturer brochure. Empty sections are hidden.
The Alpha E-Tec EHP is a monobloc inverter heat pump, utilising R32 refrigerant. As an external unit, it is designed to operate effectively in UK climates, capable of functioning down to an outdoor temperature of -5°C. This 4 kW heat pump is intended as the external component of a hybrid system, working in conjunction with an indoor gas boiler that offers a modulation range from 4.3 to 33 kW.
Installation requires specific clearances: a minimum of 250 mm to the sides and behind the unit, and 350 mm to the front. The physical dimensions of the outdoor unit are 681 mm in height, 845 mm in width, and 285 mm in depth. Electrical connection requires a 220 V, 50 Hz, single-phase supply, protected by a 16 A MCB, with a maximum power consumption of 2.369 kW.
Hydraulically, the system operates with a maximum pressure of 3 bar and requires a minimum water flow rate of 8.33 litres per minute. A 22 mm pipe size is specified for connections. A buffer tank is conditionally required, particularly for systems with a total water content lower than 20 litres, to ensure optimal operation and prevent short cycling. The unit features automatic defrost functionality to maintain efficiency in colder conditions.
Control options include the Smartech wireless controller, with built-in Wi-Fi and Modbus compatibility, enabling advanced system management and weather compensation. Annual servicing is recommended every 12 months, involving checks of electrical contacts, unit clearances, and the air heat exchanger fins. The service routine also includes cleaning the fan blades, checking the condensation drain, and inspecting pipe insulation. Crucially, the system water strainer and any magnetic system filter require cleaning. If glycol is used, its concentration must be verified. For planning purposes, the MCS-020 standard indicates a minimum planning distance of 1 metre for sound emissions. Warranty registration is required.
Common questions from engineers and homeowners about the Alpha E-Tec external heat pump.
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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 28 April 2026.