Air Source
MJS Whisper
The Heat Pump
Whispering Comfort: The Sophistication of Heat Pumps
Air Source
Air Source Heat Pumps

Maximum performance, minimum environmental impact:

An optimum heating system begins with MJS Whisper Heat Pumps

The MJS Whisper Air Source
Heat Pump R290

(Available in 4 models)


An exceeding high SCOP
(Seasonal Coefficient Of Performance)
of 5.7, places this device eligible for maximum subsidy funding.

Technical Features

  • Heat outlet temperatures of up to 72 °C
  • Available in heat outputs of 7 kW, 10 kW, 15 kW and 18kW @ 400 V
  • Also available 7 kW , 10 kW and 15kW @ 230 V
  • Propane (R290) is an environmentally friendly refrigerant with no global warming potential
  • Optimal room temperatures all year round due to integrated active cooling
  • Durable and weather-resistant, built with high-quality materials such as stainless steel.

Best Suitable For

  • Single-family homes
  • Multi-family buildings
  • New buildings
  • Refurbishments

The MJS Whisper Air Source
Heat Pump R410A

(Available in 3 models)


Exceedingly economical heating and cooling with a SCOP of 5 (5 kW heat output to 1 kW of energy input).

Technical Features

  • Heat outlet temperatures of up to 62 °C
  • Available in heat outputs of 8 kW, 12 kW and 18 kW Both @ 230V & 400V
  • Optimal room temperatures all year round due to integrated active cooling
  • Durable and high grade weather-resistant materials, such as aluminum and Stanless Steel

Best Suitable For

  • Single-family homes
  • Multi-family buildings
  • New buildings
  • Refurbishments

The MJS Whisper Air Source Heat Pump

Intelligent Heat Pump Control Heating, Hot Water and Photovoltaic

The “webcontrolAT” is a resourceful and innovative heat pump control solution, easy to use and convenient to regulate room temperatures; also for cooling and hot water preparation at any time. You stay in full control while maximising the heat pump’s energy efficiency. Any error notifications are immediately sent via SMS or email, keeping you updated at all times.

Our System Offers:

  • Comprehensive control of your heat pump system.
  • Convenient browser-based operation.
  • No app and no software download required Compatibility with Modbus, KNX, PV Synchro, DI and Smart Grid.
  • Highest security standard due to VPN encryption
  • Data security through local storage.
  • Live and long-term data can be accessed from any device using any browser, regardless of location.

Hygienic Domestic Hot Water Prep

Immerse yourself in the world of comfortable and hygienically pure hot water – a reality with the innovative Fresh Hot Water System. Enjoy prompt domestic hot water for your entire household. The system is seamlessly integrated into the MJS Whisper Heat pump. The heating buffer storage works like a modern instantaneous water heater. While the counter-current flow protects against any Legionella growth and build-up, a simple turn of the tap is enough to prompt the flow of cold drinking water through the fresh water system, bringing the water to the desired temperature in minutes. The maintenance- free hot water preparation works without additional electrical heating, protects the heat pump and guarantees a long service life.


  • Prevents germs or Legionella growth in drinking water
  • Lower energy demand (no constant heating up the storage contents
  • Rapid heating to the recommended 48°C, prevents water lime flocculate
  • Photovoltaic connection possible
  • Storage sizes: 300, 500, 850 and 1,500 litres

Download Product Specifications

Your Reliable Choice for First-Class Heat Pumps

MJS Energy, a distinguished British company, has partnered with Heliotherm, a leading heat pump manufacturer based in Austria, to introduce the groundbreaking MJS Whisper heat pump. This collaborative effort combines the expertise of MJS Energy with Heliotherm’s renowned technology, resulting in an innovative heat pump solution that sets new standards in energy efficiency and performance.

Heliotherm, founded in 1987 by managing director Andreas Bangheri, has established itself as a pioneer in the heat pump industry, with its headquarters located in Langkampfen, Tyrol. The company’s commitment to excellence is evident in its cutting-edge research and development centre, equipped with specialised facilities like an endurance test bench and climate chamber. Heliotherm’s dedication to quality is underscored by its “Made in Austria” label, a hallmark of superior craftsmanship and innovation.

The MJS Whisper heat pump harnesses Heliotherm’s patented technology to efficiently utilise the natural energy stored in the environment, for heating, cooling, and domestic hot water preparation. This advanced technology not only ensures exceptional performance but also makes the MJS Whisper eligible for maximum funding, in line with the growing demand for sustainable energy solutions.

In today’s era of escalating energy costs and urgent environmental concerns, the collaboration between MJS Energy and Heliotherm represents a significant step towards a more sustainable future. With over 60,000 satisfied customers across Europe, Heliotherm’s track record of innovation and customer satisfaction speaks volumes about the reliability and effectiveness of the MJS Whisper heat pump.

Together, MJS Energy and Heliotherm are driving the transition towards energy independence, offering a revolutionary heat pump solution that empowers individuals and businesses to embrace sustainability while reducing their environmental impact.

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