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Economical heating with heat pump.

Heat pumps are the most economical way of heating compared to other solutions. The savings we make compared to a regular oil boiler are about 70%. For example, a 100sqm house that consumes 1.5 tons of oil per year will pay 1.23 € x 1,500 lt = 1.845,00 €. According to a study by the National Technical University of Athens, the cost of heating with a heat pump amounts to 1/3 of the cost of heating with oil. The result is that the owner of the house will spend just € 615.00 for heating with a heat pump. The savings are great, so the depreciation time is short.


Low temperature heat pumps.

The low temperature heat pump (55 ° C water supply temperature) is a good choice in terms of cost. It can cover up to 100sq.m house. It combines heating and hot water production. Recommended for heating and cooling with fan-coils or cooling with underfloor heating systems.


Medium-temperature heat pumps.

The medium temperature heat pump (65 ° C water supply temperature) is a better choice than its purchase cost. It can cover up to 180sq.m house. It combines heating and hot water production. Replaces existing boiler (oil, biomass, wood, etc.) without extra work and connects to existing radiators (panel panels or slices, fan-coils or underfloor heating).


High temperature heat pumps.

The high temperature heat pump (85 ° C water supply temperature) is the best value for money purchase option. It can cover up to 100sq.m house. It combines heating and hot water production. It combines heating and hot water production. Replaces existing boiler (oil, biomass, wood, etc.) without extra work and attaches to existing panel body or slab radiators.

Why high temperature pumps?

Price high temperature heat pumps are more expensive than low or medium heat pumps. We choose them when we need hot water temperatures in excess of 60 ° C. They have better COP efficiency and consume less current than low temperature pumps when producing hot water above 60-65 ° C. Simply put, a high temperature pump (80 ° C) works "loosely" at 60-65 ° C while a low pump "burns everything" and burns above. The high-temperature heat pump is a two-stage, that is, it operates with 2 compressors, thus achieving an output water temperature of 80 ° C even external temperatures of -15 ° C. This cannot be done by heat pumps that work with only one compressor.

It is recommended to study heat loss and body measurements by a qualified engineer before installing a heating system.

Solar heating

The basic principle of solar heating operation, often referred to as "solar heating assistance" because it operates as a support, is to place a collector array on the roof or roof of the building, which warms the water. The hot water is then stored in a boiler and then used to boost the building's heating. This system also produces hot water for use. It should be noted that a solar heating system can be installed not only in new homes but also in old ones. The energy savings that are made guarantee the rapid depreciation of the value of the system. Ideal combination for underfloor heating. A solar heating system can be combined with a boiler, an energy fireplace or even an air-water heat pump for maximum savings. It should be emphasized that the utilization of solar energy is ideally combined with underfloor heating as well as the use of fan coils, while it is not the case where conventional radiators are already used.

How does it work with the existing system?

The autonomous solar heating system operates on the basis of the solar energy absorbed by the collectors and transmitted to the radiator which transmits it. It requires sunshine. It provides free energy for heating in the selected area and the operation of the regular heating system begins only when solar heating is not sufficient for the space heating needs. No energy storage required. Depending on the size of the heated surface and the thermal insulation of the building, the size of the lining (collectors and Fan Coils) is also determined.

Application and utility

Ideal for vacations, offices, shops etc. operating throughout the day, as well as selected main residence areas. A high-efficiency 5.2 sq. Ft. Collector system saves about 250 liters of oil each winter for many years.

What is Solar Heating for Small Areas

A low-cost Solar Heating System consists, at a minimum, of two high-performance solar panels mounted on the roof of the building and a Fan Coil installed on the floor or wall of the room. It works in addition to the main heating system.

Heating with biomass

One form of alternative heating is the biomass burner. It shows very little differences with the pellet boiler. The main difference is that the pellet boiler only burns pellets, while the biomass burner burns pellets, crushed wood, shells or even pellets. The term biomass predominated for solid materials larger than pellets. Each fuel needs a different boiler setting to fit into that burner. The cheaper boilers, for example, have manual adjustments depending on what material we want to consume, while the more expensive boilers have electronic panels, making it easier to choose materials. It should be noted that we cannot in any case mix materials because each of them has its own characteristics.

How much does it cost?

Ideally, savings can exceed 50% compared to oil. The biomass boiler, which does not have an automatic fueling system, can cost up to 2,000 euros - of Turkish origin - while the boiler - of Austrian origin - can cost up to 10,000 euros.

How does it work;

Its operation is simple. It is connected to the radiators and its performance depends on the composition and quality of the material we burn. The walnut shell, the almond shell, and the other pellets are different.


The main categories of a biomass burner

There are two main types of biomass burners. One category includes those that operate with automatic coupling, while the other category includes those that operate without automatic coupling. The first category operates with a thermostat, while the second requires manual operation from the boiler room.

Cleaning time - Maintenance procedure

Burner time from burner to burner varies. Some are manually brushed by the owner, others are semi-automatic using a lever - removes the waste from the inside - and others completely automatically. In the case of a manual burner, cleaning should be done every three days.

Horizontal burner burners - heat emitting tubes - need cleaning at least once a week, while those with vertical burners are cleaned about once a month.

Time - Installation procedure

Installing such a burner takes 2 to 3 days, and the old oil burner can also be converted, which is usually not recommended because it does not meet the biomass fuel specification requirements and is usually not as efficient as a new one.

What to watch for when buying?

What you pay for it is also true. It is important for prospective buyers to look for the source company through its official website and demand to know the exact features of the product they are interested in. Most traders usually avoid specifying the frequency of cleaning such a burner and instead of informing customers once a week that it is done once a month.

How is its market subsidized?

This form of alternative energy is also subsidized by the Ministry of the Environment's "Home Savings" program from 30% to 70%, while the rest of the amount is subsidized in the form of a bank loan at a favorable rate. What everyone who deals with alternative sources of heat admits is the crunch that usually exists until the approval and disbursement of the subsidy amount. However, at a time when even the slightest euro that comes out of our pockets is important, it is important to look for a source of heat different from the traditional ones, even if we have to wait a little longer to subsidize energy upgrades. of our home.

Infrared heating

Infrared heating is a new, economical and ecological way of heating, which works just like the sun's rays. It has the ability to directly heat bodies and objects without heating the air around them and is a natural way of heating, the way nature has chosen to heat us!


How does heating work?

A little physics

Heat is transmitted in 3 ways: by treatment, by transport and by radiation.

With treatment

For the conduction of heat by conduction, it is necessary to physically contact an object with the heat source. In this way the object with the highest temperature heats the coldest until the temperature of the two objects is balanced.
Example: When you touch the pan in the kitchen eye, it warms up. In turn it warms the water inside it and in contact with its walls, etc.

By carriage

In liquids and gases heat is transmitted by transport. During this transfer, quantities of liquid or gas are heated and transported to a cooler area above the original, where they cause it to heat up. Subsequently, the hot air or liquid gradually loses its temperature and results in the lower layers being reheated again. This heating process is widely used for both domestic and industrial use. 


     With thermal radiation

The transfer of heat by transfer or treatment requires n in the presence of matter (solids, liquids or gases). But heat also diffuses into the vacuum emitted by the surface of a body due to its temperature. A well-known example in nature is the heating of the Earth by the Sun, where it does not use matter as a means of propagation.

This method of heat dissipation is called thermal radiation diffusion. Thermal radiation is propagated in space by electromagnetic waves (similar to light), absorbed by objects and heats them. The most common form of thermal radiation is infrared.

Humans, throughout their rational presence on Earth, are heated by infrared radiation as they use fire as a means of heating. Only in the last century have the houses been heated by the central heating system based on mild hot air circulation.

The fire warms the air around it and rises upwards, draining the combustion gases, while fresh air takes its place maintaining the combustion. Heat is radiated from the fire in all directions in the form of thermal (infrared) radiation.

In the same way it warms the fireplace. But in the common fireplace, most of the heat generated by the fire is spent on heating the air that escapes hot from the chimney. Only about 12% of the heat produced is radiated from the fireplace and heats us.

Thermal radiation, like any type of radiation, only heats where it is directly affected, as opposed to heat transfer, where warm air can diffuse through open doors and warm up adjacent spaces.

What is infrared radiation?

One of the most well-known radiation in recent years, not for its negative side effects on humans and the Earth, but for its applications and positive benefits in medicine and technology is infrared radiation, also known as infrared heat. It extends from 300 millimeters to 750 nanometers of the electromagnetic spectrum and is formed on hot surfaces of objects by the molecular oscillation of matter atoms. The wavelength of infrared radiation is greater than that of visible light, so the transmitted energy is shorter. It is divided into three categories. In the near infrared just above the visible light, the distant or otherwise biogenetic and the medium between the two.

This is the most common way of heating in the universe and on Earth. An object that is warmer than its environment radiates heat. Infrared radiation does not need any means to transmit it. It is also transmitted in space. In this way the sun warms the Earth and all the other planets. This is how people heat up when they discover the fire, since the fire warms the air around it but escapes upward from chimneys or open spaces, but radiates heat around it and so does the objects and the people near her. This is also the way our fellow citizens returned by putting the forgotten fireplaces back on. Although not the most efficient way to create infrared radiation, it does its job.


Where it is based

Infrared heating is based on infrared emission. Infrared rays are electromagnetic waves beneath the red area of the visible light. Infrared thermal radiation has nothing to do with harmful ultraviolet radiation, which is responsible for burns and skin injuries. Infrared waves are a form of energy that can warm objects without heating the air around them.

Infrared radiation has some peculiarities:

The warmer the object that produces it, the more intense it is and the farther it reaches. The fire in the fireplace warms up better. Radiators also radiate infrared radiation, but are weak as they raise temperatures to 70 degrees Celsius. Like the human body itself, which emits infrared radiation due to its biogenic heat. Detection of this radiation is based on thermal detectors that detect living organisms when there is no direct visible contact with them. The sun, of course, with the temperature of millions of degrees, sends heat to Earth and makes it habitable.

Infrared radiation only warms things that absorb and stop it:

It will not warm the air or the water, it will pass through it. It will not warm the windows, it will cross them. But it will warm up the furniture, the floors, the walls, ourselves. There is, of course, a secondary process that involves heat transfer: Cold air will come into contact with the warm - by infrared - floor, with the warm walls, with the warm furniture, and he will start warming up. Not to the extent that it does with the central heating system, but it does.

Infrared radiation is penetrating:

It will penetrate the tiles, the plaster, the woods and warm them deeply. This will keep them warm for a while even when the infrared emission has stopped functioning as mild circulating heat sources.

Infrared radiation is beneficial to health:

Unlike the other side of the solar spectrum, where ultraviolet rays are found and responsible for the tan we get in the summer but also for damage to our health, infrared radiation does good for the bones, the bloodstream and in regulating the sleep cycle. And of course, in the secondary, it does not move germs and other harmful particles into space, as does the gentle and forced air circulation that brings them directly into our respiratory system.

Infrared radiation is economical:

When used for heating, it is more economical. By its very nature all energy is transmitted without loss where it is needed: To objects and to humans. Radiator heating needs from 150wp - 300wp of heating per square meter as it has to warm the air which will cool by contact with the roof, walls and floors before it can warm people up and cool down more if there is a loss of hot air from the room and an influx of cold. Infrared heating does not have such losses, as it is unaffected by the air, the floors, the ceiling, the walls and the temperature will reach directly to the people in the room and warm them up. The range plays a role (how far the radiation can reach), which is regulated by the rated power of the body and ultimately the thermal losses for the feeling of thermal comfort. For this reason they require about 50wp - 150wp infrared heating per square meter.

Can be used directly by the sun: We lift the awning in the morning on the balconies facing the sun, with the balcony doors closed. The infrared coming from the sun will pass through the glazing and fall on the objects, on the floor, on the walls that will heat up. In turn these will heat the air.

With infrared devices using ultra-hot materials that radiate infrared radiation from their surface. The higher the heat of the objects and the greater their surface area, the more intense (strong) the infrared radiation they emit and the more efficient the heating. The objects used are heated either chemically (burning wood in the fireplace) or electrically (electrical resistors). When electrically heated, almost all of the energy provided by the electricity is converted into the heat of the articles and then into space heating.

Depending on the material from which the infrared radiators are made, either large or small energy savings can be made.

If metals are used (aluminum or iron plates) then heating is quick. But the faster the metals heat up, the faster they cool down when the power supply stops. The savings on these materials are 1: 1.2 - 1: 1.4 (120% - 140% yield). That is to say 1.2 - 1.4kw of heat is given for each kW of electricity (since the metals remain hot and radiate heat for a short time after the power outage). Such bodies are infrared convectors, high temperature panels and some printable wall panels.

If silicon-based materials (cement, gypsum board, marble, etc.) are used, the heat is slightly slower than in metals but the heat remains for a longer time after power failure. The savings on these materials are 1: 1.5 - 1: 2 (150% - 200% yield). That is to say 1.5 - 2kw of heating per kW of electricity. Such bodies are some wall panels printable or not.

If ceramic materials are used (tiles with immersed electrical resistance in their material) the heating is slower than in metals but the heat remains for a much longer time after the power failure, since the ceramics have a very high thermal inertia. The savings on these materials are 1: 2 - 1: 4 (200% - 400% yield). That is to say 2kw - 4kw of heating for each kW of electricity. In practice, the power is supplied for 15 ', the ceramic comes in at temperatures of 300 ° C - 1200 ° C - depending on the ceramic - and then radiates for 45' after the power supply has been switched off. So if a body has a rated power of 1000wp, it works like 500wp - 250wp. Such bodies are ceramic infrared heaters.

To achieve the savings described, it is necessary to use automatic power supply controllers. Timers, indoor thermostats or space thermostats can be used. A combination of all three of these methods is commonly used: There are built-in thermal switches in the bodies, which also act as safety valves to prevent damage to the device from overheating. They interrupt the power supply when the temperature of the body itself exceeds a certain safety limit. The device is supplied by a room thermostat which interrupts the supply to the device when the room temperature exceeds that desired by the user. Finally, the room thermostat can be programmable with a simple or more complex timer built-in so that the room temperature can be adjusted to different levels according to the time.

Infrared radiation is ecological:

Due to the low energy consumption required, infrared heating results in low emission of pollutants. This makes it the most eco-friendly method of heating, especially if no fuel is used for heating but electricity. This has an immediate financial consequence, as property taxation will be adjusted in the coming years in relation to the pollutants produced. The pollutants generated by the use of a property will be calculated and the more polluting it is, the more tax we will pay.

Why choose her?


With infrared heaters you achieve maximum thermal efficiency and energy saving. Heat is transmitted directly to the body without heating the intermediate air, achieving uniform room temperature and maximum economy.

Environmental Protection

The use of heaters does not need to burn harmful to the environment, such as oil, gas, pellets or firewood. It has, as an infrared system, the lowest environmental impacts compared to all other heating systems in the world. Also, the heaters do not emit exhaust products or other harmful gases into the atmosphere, keeping our environment clean.


An important advantage of infrared heaters are the positive health effects due to the cleaner air in the room, the superior thermal comfort they provide, help to deal with colds and rheumatism, and help prevent asthma outbreaks and other allergic reactions.

Electric boilers: The most reliable solution for oil dependence

Electric boilers are supplied with electricity from the existing electricity grid, while their operation is based on the traditional way of heating the radiators (radiators, underfloor heating, fan coil).

Electric boilers are supplied with electricity from the existing electricity grid, while their operation is based on the traditional way of heating the radiators (radiators, underfloor heating, fan coil). That is, they retain all the benefits of heating oil with fuel, but we are relieved of the burden of being supplied with this expensive (at least for Greece) energy source. Therefore electric boilers are an affordable and smart solution for heating and hot water. After all, they are easily and quickly installed without much space and without the need for chimneys and fuel tanks. They are ideally suited for permanent and holiday homes, apartments and business premises.

The boiler unit itself is about the size of a closet. It is mainly installed inside the house so that it can achieve zero loss and at the same time better control of the machine, however it can also be installed outdoors, e.g. where the oil boiler was located. Indicatively, for an apartment of 50-100 square meters, a boiler with a nominal power of 8 KW is required, while for residential units up to 180 sq.m the required power reaches 14 KW. In the case of underfloor heating, however, where the required water temperature is lower, the power required falls even by half. Regarding their operation, electric boilers are integrated units comprising three electrical components, generator switch, circulator, safety thermostat, electronic control, operation panel, pressure gauge, thermometer and closed expansion tank, while their efficiency coefficient reaches 99%.

Installation and cost


Of the most important for the installation and operation of the system for a single-tube system is the connection of the boiler to the central panel of the property heating system, while the two-tube system requires more intervention, ie cutting from the columns of the old two-tube system and forming paths to a central point of all bodies. In terms of cost, the purchase price of an electric boiler starts at € 700 (in the case of low-power single-phase appliances) and can reach up to € 2,000 (high-power three-phase boiler to cover larger dwellings). Costs should also be taken into account for the interventions described above required for the boiler installation, which may amount to approximately 1,500 euros. What should also be noted regarding their installation is that power boilers up to 10 KW can operate both single-phase and three-phase supply. Larger power models, however, which are required for large heating needs, require three-phase supply.

In conclusion, it is worth stressing that market research before acquiring a boiler is necessary, and consumers should be particularly cautious about companies that promise returns far higher than they can actually catch.

Air conditioning

HELLAS-NRG undertakes the supply of your air conditioner for home or professional use, providing the study, design, installation, maintenance and repair of any type of air conditioner (Split - wall, floor - ceiling, air ducts, ceilings, cartridges). multi, VRV systems, chillers etc.) Ask us for any of your above needs and we will respond promptly, qualitatively and at the most competitive prices!


234 Petrou Rally Ave. Nikea, Greece


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