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Monobloc air source heat pump

Monobloc air source heat pump

Air source heat pumps are a reliable, energy-efficient solution for heating, air conditioning and hot water supply. These systems use free energy from the surrounding air to generate heat, which is many times more economical than traditional heating systems, such as gas or pellet boilers. Air-to-water heat pumps come in two types of systems: monoblock and split. In this article, we will look at the air-to-water heat pump of the monoblock type, its features and differences in comparison with the split system. 

Monoblock heat pump for heating and cooling 

Monoblock heat pumps have a single compact unit that contains all the components of the refrigeration system, including the compressor, evaporator, and condenser. This integrated design eliminates the need for refrigeration pipework connections between indoor and outdoor units, simplifying installation and reducing potential refrigerant leaks. Monobloc heat pumps are particularly suitable for indoor installation, giving homeowners greater flexibility in placement.


Key features of the air-to-water monoblock heat pump

  • Simplified installation, as installers do not need to obtain a special permit to use refrigerant.
  • No risk of refrigerant leakage, as it is supplied already charged and closed in the circuit.
  • Flexible installation - the use of wide pipes allows for virtually unlimited distance between the outdoor and indoor units

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Comparison of monoblock and split systems


The choice between a monobloc air-to-water heat pump and a split system depends on several factors, including the specific requirements of your home and the climate conditions.


Monoblocs are generally the better choice for most homes due to their ease of installation and ability to be installed on properties of any size. Compared to split systems, which have certain restrictions on the distance between the heat pump elements (indoor and outdoor module), monoblocks offer more flexibility. Mostly, monoblock heat pumps are used in countries with mild climates where there are no critical low temperatures. This situation is due to the fact that the heat carrier circulating in the pipelines between the outdoor unit and the house is water, and in the event of an emergency power outage, there is a risk of freezing of the heat carrier in the outdoor unit or pipes.


For countries with colder climates and unstable power supply, when using monoblock heat pumps, it is recommended to use a non-freezing solution, such as polypropylene glycol, instead of water or to install uninterruptible power supply systems that ensure stable operation of the system even in case of a power outage. However, it should be remembered that the use of glycol reduces the efficiency of the heat pump, because the non-freezing solution has worse thermal characteristics than water.  Unlike a monoblock, a split system has no restrictions related to the danger of freezing when the power is turned off at low outside temperatures. Let's take a closer look at the features of using a split air-water heat pump in the article "Air-water split heat pump".


What can Hajster NEBO mono heat pumps do?

  • For Efficient heating down to -20 °C (at low temperatures, the backup electric heating element is switched on);
  • High COP (ratio of heating/cooling to electricity consumption) - 5.05;
  • Integrated energy efficiency meter;
  • Low noise level of the heat pump - no more than ... dB.
  • Colour touchscreen display of our design;
  • Remote control of the heat pump;
  • Inverter technology of compressor operation (economical regulation of heat output according to environmental conditions) 
  • Ozone-friendly R290 refrigerant;
  • Warranty - 5 years

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Advantages of Hajster heat pumps:

  • For Official 5-year warranty for all products.
  • 24/7 service support with the possibility of individual problem solving.
  • A complete solution for heating, cooling and hot water: Hajster Nebo mono and Hajster Nebo split air-to-water heat pumps and Hajster GRUNT geothermal heat pumps.
  • A feature of Hajster's monoblock heat pumps is the presence of an integrated anti-freeze system that protects the system from damage due to low temperatures during power outages.

The Hajster NEBO split and Hajster NEBO mono air-to-water heat pumps are advanced solution for those who value quality equipment and low bills. 


Do you have any questions? Contact Hajster experts: they will provide a detailed answer and select an individual solution. Save your time - turn to professionals!

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