Air-to water systems

Air-to-water heat pumps extract heat from the outside temperature and transform it into heating energy of different assets. This process can be reversible and used also for cooling. These heat pumps have gone through revolutionary development that makes possible to operate them with high efficiency taking into consideration the permanent increase of price of natural gas and special low tariffs for heat pumps.
Three main types exist:

1. Units that are used most often in existing buildings when compact outdoor units are installed next to buildings. These units generates the necessary heat and the heating water flows into the building through pipelines.
2. Split heat pumps that consist of an indoor unit and an outdoor one. They are connected with pipelines. Heat extracted from the air by the ootdoor unit is transferred to the indoor unit at low temperature. The indoor unit increases this heat amount to a higher temperature level that is high enough for heating.
3. An indoor unit is installed in the building and the outside air is transferred to and out of the unit through a ventillation system.

Of course, the most suitable system must be chosen for each particular building.

Advantages:

• easy installation,
• investment costs are the lowest comparing with all other types of heat pump systems since there is no need in boreholes, horizontal collectors or water wells,
• up.to-date units can be operated till even -10 °C-ig more effectively than traditional heating systems on natural gas (please check how long and how many times do we have really cold winters, colder than those -10 C? Our answer is that during the whole hating season you can measure these extremely cold periods in hours only. And one more thing: most of people lower the room temperature for nights. Does it make sense to install borehole systems for small residental size houses for millions of HUF? In our opinion, let's say for a 150-sqm house, the answer is no... The extra costs paid for the boreholes are disproportionate with the lower operation costs.)
• these systems are highly efficient in spring and authumn.

Disadvantages:

• there is a general truth that when the heat demand is the highest, the temperature of the outside air is the lowest. So the efficiency of the system falls. Nevertheless, please take into consideration the above explanations when making your decision.
• since humidity from the air freezes on the outdoor unit at temperatures lower than 0 C, periodical defrosting must be carried out and this consumes energy,
• in units with reversible cycle (units capable for cooling) the opposite will happen: the cooling demand is the highest when the outside temperature is the highest. So the efficiency falls.
• you shall consider that you may also need a complementary heating system because the heat pump may not fulfil the whole heat request in cold winters. But this is the question of system design and it absolutely does not mean that you will have to install a gas boiler in parallel. There are other well-known simple and cost effective methods of solving this problem.
• coefficient of performance (COP) and seasonal performance factor are the lowest in comparison with other primary sources (but don't forget: comparing with natural gas, air-to-water heat pump systems are very efficient).

If based on the above introduction you are interested in an air-to-water system, please, do not hesitate to contact us. We are interested in offering you not only a good heat pump but a good system.

Finally, we are pleased to inform you that an independent laboratory evaluated a Hotjet ask unit and found its parameters so excellent that it can enter into any competition with any competitors in this market. For example, parameters of this Hotjet ask unit were better than thoss of well-known Japanese or South-Korean manufacturers.