BoxAir Inverter Split heat pump

Extremely quiet and economical air-to-water heat pump in split design. The most valuable parts are stored in the unit inside the object. Even lower outdoor noise level of the pump.

Energy efficiency Energy efficiency
R410a refrigerant R410a refrigerant
Heating water temperature up to 65 °C Heating water temperature up to 65 °C
Output from 1 to 22 kW Output from 1 to 22 kW
Online control & 24/7 remote monitoring Online control & 24/7 remote monitoring
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Main features

Air-to-water heat pump of split design The most valuable parts of the heat pump are stored in a unit inside the building The connecting pipes of the indoor and outdoor units form the low pressure (cold) part of the cooling circuit, so that heat loss through the pipework is completely eliminated Distance between indoor and outdoor units up to 15 metres Low heating water volume requirements in the system Support for connection to the power cascade without the need for a third-party MaR (measurement and control) system

24/7 remote service monitoring and diagnostics Absolute reliability thanks to our 20+ years of commercial & industrial experience Extensive intelligent optional equipment: internet connection (monitoring and logging), modbus/BMS, integrated MID electric/heat meter, communication with PV Inverter and Batteries, smart grid etc. Active cooling mode (optional equipment) Use for heating and cooling of the building including hot water supply Minimised noise in the outdoor unit due to ultraquiet fans and no compressor Indoor unit with compressor sound attenuated to the level of a conventional refrigerator

Avaliable in 3 phases / 1 phase variant Built-in heating side circulation pump Minimized noise due to ultra-quiet fans with smooth speed control

Max heating water temperature 60 °C Outdoor temperature range from -20 °C to +40 °C Integrated electric boiler (automatic connection of electric supply if required without affecting the thermal comfort of the building

Technical details

of the
Seasonal energy
efficiency of
heating at 35 °C
low temperature
Seasonal energy
efficiency of
heating at 55 °C
medium temperature
pressure level
Lp (5 m outside
of unit)
Order number
(according to heating circuit control)
BoxAir 22IS 2–7up to 5,54.38 A++ 3.33 A++ 341BA22IS-011BA22IS-11
BoxAir 26IS 3–9up to 8,5  4.29A++3.24A++341BA26IS-01 1BA26IS-11
BoxAir 37IS      5–17up to 13 4.49 A+++3.51A++411BA37IS-011BA37IS-11
BoxAir 45IS  7–22up to164.46 A+++ 3.48 A++411BA45IS-01 1BA45IS-11

Regulation STANDARD (μPC): Designed for single-circuit heating systems. No auxilliary heating circuit, 1-zone space temperature, 1 heating circuit.

Regulation PLUS (pCO5): Designed for multiple-circuit heating systems. 2 independent auxilliary heating circuits including mixing. 2-zone space temperature, up to 6 heating circuits.

Master Therm software

Master Therm software

Unique Master Therm software for heat pump control

Custom application for controlling the cooling circuit and peripherals Equithermal MaR (measurement and regulation) Advanced temperature feedback control in the building based on internal room temperature sensors Control via touchscreen terminal or online application Includes remote service monitoring and diagnostics Includes remote service monitoring and diagnostics

Download software AppStore GooglePlay

Optional equipment selection

7-year warranty on the complete pump 1O7Z Extended warranty valid from the time of the pump's installation
Master Therm Online App Connecting the pump to a central Master Therm server allows the pump to be controlled online from anywhere via the web or app. Includes remote service access.
Reverse cooling mode Reverse pump operation allowing long-term cooling of the interior in summer.
Reverse pump operation allowing long-term cooling of the interior in summer. Terminal with temperature sensor for placing additional heating circuits in the reference rooms (only for PLUS control).
Desuperheater for high efficiency hot water heating Integrated device that uses a separate hydraulic circuit to remove the heat of superheated steam at the compressor outlet and increase the efficiency of hot water preparation (heating). When the compressor is in operation (heating and cooling mode), part of its thermal energy is permanently transferred to the hot water tank.
Room unit for auxiliary heating circuit Terminal with temperature sensor for placing additional heating circuits in the reference rooms (only for PLUS control).
Room unit for auxiliary heating circuit with humidity sensor An extra humidity sensor for eliminating condensation during cooling (only for PLUS control regulation).
Expansion module for PLUS control Increases the number of regulated auxiliary heating circuits up to 6 (from the basic 2).
Integrated electric meter 3x 65 A Built-in 3-phase electric meter for local measurement of electricity consumption. MID certification.
RAL colour Individual colour for pump panels.

How it works

Air-to-water heat pumps are based on the principle of obtaining heat from the surrounding air, the temperature of which can be many degrees Celsius below zero. The heat taken from the surroundings is transferred to the heating water of the heating object by means of a heat pump, or used for the preparation of hot water. The system achieves a seasonal efficiency of up to 4.5 times higher than a conventional electric boiler and thus brings significant energy savings.

Among the biggest advantages of air-to-water pumps are relatively low investment costs, fast and easy installation and easy availability of the primary energy source: air is all around us.

Air-to-water heat pumps are suitable not only for heating and year-round heating of hot water or swimming pools, but also for cooling the building in the summer months thanks to the possibility of reverse operation.

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