HYSS - more than a heat pump!

Free Energy’s vision is to provide solar-based energy systems that can deliver all the energy that a building could need. We have therefore developed HYSS - a hybrid heating pump - the most cost-effective and environmentally friendly heating system on the market.

Fact 1
A typical roof in Norway receives annually 4-5 times more solar energy than the household consumes in a year.

Fact 2
In less than 1 hour, the global solar radiation will be equivalent to Earth's annual energy consumption.

Fact 3
If 2 thousandths of Norway's land area were covered with solar collectors (efficiency 50%) and solar panels (efficiency 12.5%), it'll be equivalent to the country's annual energy consumption.

 HYSS - Hybrid Solar System - an innovative combination solution that utilizes solar heat and heat pump technology in an optimal way. HYSS can easily be configured into a geothermal pump, ground heating pump or marine heating pump, all of which can be combined with solar heating. It is also possible to combine an air outlet with a shorter ground loop or a shorter bore hole. No matter what type of heating pump you have, performance will improve with solar heat, which means that you get a very efficient operating system. The solar heat generally halves the operating time of the compressor, which causes the heating pump to have a significantly longer service life. With an HYSS system you get 5-7 parts of heat and hot water for each part of electricity that the system uses.


This results in a shorter payback period of the system, because the solar collectors is being used for both hot water production and to increase the efficiency of the heat pump.

With HYSS you will get a complete heating system ensuring both heating and hot water and is suitable both for new buildings and rehabilitation or replacement of existing heating systems.

HYSS is delivered with integrated measuring equipment allowing you to monitor the performance of the system both in real time (COP) and for longer periods of time (SCOP). With internet connection you'll automatically get the latest and best software available. Everything is designed to get the best experience with a modern iPad application leaving you in full control of your system anytime and anywhere.

Finding cost and savings for your project quick and easy

With the industry's easiest savings calculation and online offer, you will quickly find the complete cost for your HYSS-system and simultaneously see your annual savings in heating cost.

Enter five simple information points about your current energy consumption to get an instant overview for your possible savings. 

Then click "Get online offer" to enter some additional information. When you are done you will receive an offer in pdf-format to your entered email address, complete with specifications for your HYSS-system, cost and annual savings.

Click here to get started.

HYSS - a unique heat pump powered by the sun

Utilization of solar energy for heat pump efficiency is designed as an integrated part of the heat pump. That is why you will achieve very good operational economy without excessive investment costs.

Intelligent management of priorities for the use and storage of low, medium and high temperatures from the solar heat results in a higher annual efficiency (SCOP).

To heat and hot water, 7-8 months

High temperatures from the solar collectors are stored directly in the tank. For 7-8 months a year solar heating alone manages to heat the storage tank above 60ºC without supplementary energy from the heat pump. In this way, the solar heating provides virtually free hot water in large parts of the year which improves the annual efficiency (SCOP) for the HYSS-system. During the summer months the solar heating also contributes in decreasing operating hours of the heat pump.


Heat pump efficiency, all year

When the heat pump i operating, the solar heat preheats the brine fluid to increase the efficiency of the heat pump. A specially made inverter controlled compressor makes it possible to apply considerably higher temperatures than normally to the heat pump.

This contributes to a significant increase in heat factor (COP) for the heat pump. Along with free hot water the annual efficiency (SCOP) is being doubled for the HYSS-system compared to a conventional ground source heat pump.


Dumping / re-charging, all year

When the collectors has low working temperature or when the storage tank is fully heated, solar heat is being used to recharge the borehole or ground loop. In this way the temperature recovers in the energy storage faster and results in increased efficiency of the heat pump. High temperatures are simultaneously being avoided in the storage tank because the excess heat from the solar collectors may be dumped in the energy storage in the ground in a simple and secure way.

You can increase the performance in an existing borehole or ground loop with HYSS because the solar heat re-charges (dumps) the excess heat all year around. This means that you can utilize existing collector even if you install a more efficient heat pump with higher power output from the collector. Thus, the use of electric heating element is reduced to a minimum. It also applies if you have extended your house and increased your energy and output needs.

You save more money with solar heating and heat pump

HYSS utilize nature's best resources and here we will explain the interaction between solar heating and the heat pump.

Solar heat preheats the brine fluid* when the heat pump is operating to improve the efficiency of the heat pump. Considerably higher temperatures than normal is being used to the heat pump due to our inverter controlled compressor. This will contribute to a substantially higher annual efficiency (SCOP) for HYSS compared to conventional technology.

Free Energy have verified how much preheating of the brine fluid* constitutes:
Testing at Danish Technological Institute shows when brine temperature is increased by 10 degrees the heat efficiency (COP) of the system increases by 36 percent. If the brine temperature is increased by 20 degrees the heat factor increases by 98 percent.

*Brine is a glycol fluid in the closed system of the heat pump and HYSS-system.

Lower operating costs with highest energy rating A+++

Free Energy's inverter controlled heat pumps in the power range from 2 to 12.1 kW in combination with solar collectors has achieved highest energy labeling (A+++), for both heating and hot water according to current eco-design and energy labeling requirements which came into effect on 26 September 2015

Eco-design requirements and energy labeling are common to all EU countries and will facilitate energy labeling of heating products. Market surveillance is now being introduced to ensure that heat pump products meets current legislation within the EU's common market. Market control will protect consumers and ensure fair competition between manufacturers. NVE (The Norwegian Water Resources and Energy Directorate) supervises that eco-design and energy labeling requirements ar met in Norway. Products which doesn't meet the eco-design and energy labeling requirements cannot be traded within the European Economic Area (EEA). NVE may order correction or issue decisions about sales ban if illegal products with incorrect labeling is uncovered.

Free Energy's Hybrid Solar System (HYSS) achieves the highest energy efficiency rating for both heating and hot water in all of its three heat pumps in the villa market. The solar-circuit supplies heat directly to the water heater when the temperature is sufficiently high. The heat from the collectors is also used to raise the temperature of the heat pumps incoming brine for a large part of the year. In some cases heat is returned to borehole or ground loop. By utilizing solar heating where it provides the most benefit, the heat pump's SCOP-combi (heating and hot water) increases to 5-7.

You can monitor the system's instantaneous heat factor (COP) and the efficiency for longer periods (SCOP) through the supplied iPad. Software is automatically updated.

Complete control - anytime and anywhere

Managing your system from your smartphone, pc or the included iPad is one of the major advantages of HYSS.

Being able to monitor the system is not just to see everything working, but also to monitor that the system provides the savings as expected. With our specially developed application you can monitor live data, history and to have complete control of the system

Our application is web-based and you will receive software updates directly to your HYSS-app over the internet.

The application also feature functionality for your installer to perform control of your system if necessary.


  Green, orange or red smileys clearly shows if your system is working fine.


The tab Operating displays your system's operating status and if the energy comes from solar collectors, heat pump or a combination of both. Samples of solar heating stored in the tank, solar heating as preheater of brine to the heat pump and solar heating stored in the ground.


You can also see the systems COP right now, SCOP (annual efficiency), split energy between the sun and ground including your savings and reduced CO2 emissions. The tab Compare energy displays the initial stored input of energy consumption and energy prices and more and is the basis for sizing and selection of system.

Sample from a facility in operation in Norway:

Click for a closer introduction to the management system.

Stylish designed cabinet that suits your home

The cabinet is designed in Scandinavia and suits both new buildings and houses where replacement of existing heating systems are applicable.

Length and width both cabinets: 60 x 60 cm, height standard model: 220 cm, height low model: 195 cm. 

Heating system with storage tank, all pumps and vents, filler, eco alert and expansion tanks for brine fluid is included in the HYSS-system. Expansion tanks are integrated inside the standard model. For the low model expansion tanks are supplied for wall mounting.

Measuring equipment which are supplied with the HYSS-system meets ENOVA's requirements for public funding.

Click to read more about the different models.


Solar collectors

The solar collectors are from one of Europe's most innovative and leading manufacturers. Due to the manufacturer's ISO certification and high standards of quality, we offer a 10 year warranty for our solar collectors.

  • High performance, Solar Keymark approved
  • Surface of collector, 2m x 1m, weight 36 kg
  • Safetyglass with matte finish to avoid annoying glare from the solar collectors
  • Black surface (coating) for discreet recessing to the roof with highly consistent performance over time
  • Rockwool 50 mm insulation with high level of insulation and density
  • Elegant and easy to install discs jacketing, also for dual rows of solar collectors
  • Developed for Nordic conditions ragarding wind, hail and snow loads

Highest quality - best guarantee arrangements

Our choice of components is the result of many years of experience and thorough testing. We offer 10 years warranty on all main components *)

An investment in HYSS - Hybrid Solar System is sensible for both economy and comfort, but also for the value of your property. With 10 year warranty, the investment is often repaid during the warranty period. Solar collectors have a lifespan of more than 30 years and borehole/ground loop may in principle work forever. During this period, when the facility already is repaid, you still have the lowest possible operational costs and thus a good chunk of money to spend on other things in life.

HYSS is tested at Danish Technological Institute in accordance with EN14285. The result of the test shows that all HYSS heat pumps achieved the highest energy rating A+++  for heating. In accordance with the European directive for eco-design and energy labeling requirements HYSS has together with solar collectors achieved the highest energy rating A+++  for both heating and hot water.

Free Energy are members of the Norwegian, Swedish and Danish Solar Energy association. Our solar collectors are approved in accordance with SOLAR KEYMARK. Our heat pumps, storage tanks, circulation pumps (class A) and other accessories are CE certified.

*) applies for the heat pump compressor, 200 liter stainless steel storage tank and solar collectors.


HYSS – get your own zero-energy or plus-energy house

Solar energy enables zero-energy and plus-energy houses for both new buildings and existing buildings being renovated.

Future buildings will meet environmental challenges and there are many good reasons to choose an environmentally friendly housing. Better health (indoor climate), eco (reduced CO2 emissions) and economy (reduced costs of heating and hot water).

In the future will all houses probably be built as passive houses. Depending on how much energy the house consumes, but also produces, will determine whether it is classified as a passive house, zero-energy house or plus-energy house. Passive house means that it is well insulated, but additionally utilizes the heat from humans and technical equipments. A zero-energy house may have solar cells for production of electricity and solar collectors with heat pump for heating and hot tap water. This makes it possible for the house itself to generate the energy needed for household, heating and hot water. Plus-energy houses produces more energy than the household consumes annually by using solar cells and solar collectors  on the roof and (or) facade.



Dreaming of a zero-energy or a plus-energy house?

Then HYSS - Hybrid Solar System vil be the right thing for you. HYSS combine solar energy and heat pump technology, i.e.. a hybrid solution, in a totally unique way. This makes HYSS the most cost- and eco-saving system on the market.

With HYSS as nucleus reduces the need for solar panels by 60% (insert link to "solar energy).

Why heat your house with anything but the sun?

HYSS is based on known technology, optimized to maximize the impact of the sun's heat. Solar collectors, speed controlled heat pump, storage tank and energy storage in the ground constitutes the main elements of the system

HYSS is a heating system, without any use of other sources of heat than the sun, covering your entire needs for hot water and heating. HYSS is delivered with integrated measuring equipment allowing you to monitor the performance of the system both in real time (COP) and for longer periods of time (SCOP). At any time you can control that the system actually provide as the calculations promises.

Klick the image to view brochure.