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Energy efficiency and heating systems

For owners of a Marles house, energy saving does not mean lowering the standard of living and comfort. On the contrary, living in a Marles house is synonymous with being aware of ecological problems and taking steps directed at environment protection and energy conservation while still enjoying optimum living conditions.
It is a known fact that by heating living spaces, heat escaping from the building is replaced. Through suitable insulation of the building envelope and an efficient heating system, heat can be kept where it is needed − in the living area.
One of the most important factors of protection against heat loss is the thermal protection of buildings. Therefore, quality materials that considerably lower the heating costs of Marles house owners are used, enabling occupants to enjoy warm homes for years and years. You can find more information on insulation materials and the building thermal envelope in the “Thermal envelope” and “Used materials” chapters, while we focus on the specific types of heating in Marles houses here.

Floor, wall and ceiling heating

PIC 3106         

Due to the extraordinary thermal characteristics of the building envelope of Marles highly efficient, low-energy and passive buildings, heat can also be supplied to the spaces via an air inlet and through low-temperature heating surfaces. Greater comfort of users can be achieved by the implementation of floor, wall and ceiling heating and this can if heating is provided by a heat pump, enable cooling in the summer time.


Heat pumps

Heating with heat pumps is an efficient and environmentally friendly way of heating. The heat drawn from the surroundings of the heat pump is solar energy accumulated in our environment, from water, air and soil, and is therefore, a renewable source of energy.

A heat pump gathers energy from its surroundings (air, water, soil) and, with the help of electric energy that runs the compressor, transforms it into useful energy of a higher thermal level. Such energy is useful for the heating and cooling of living spaces and preparation of sanitary water.

The main advantages of heating with heat pumps:

  • Use of a sustainable energy source
  •  Price efficiency in the long-term
  •  Low space requirements
  •  Possibility of obtaining a state subsidy.

Heat pump functioning scheme



 “Air – water” heat pump


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The air is an inexhaustible energy source available for free everywhere. Since it does not require any drilling or the installation of a horizontal collector, this is, investment-wise, the cheapest kind of heat pump. Assembly and maintenance are simple and cheap. With the air-water systems, we use the heat of external air for the functioning of the heat pump.
It also allows for “smart” management of weather regulation, cooling of spaces and management of the solar system. By installing a heat pump, we avoid many costs and activities relating to: boiler room, furnace, fuel storage space and tank, expensive gas connection, burner, chimney construction and expensive maintenance.

“Soil – water” heat pump


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If you have a sufficient unbuilt area surrounding your house, the best heating option for you is the soil collector. The “soil – water” heat pumps make use of the soil heat through horizontal soil collectors or through a vertical soil probe. The choice of the system depends on the available useful soil surface needed for the optimum functioning of the heat pump itself. The “soil – water” heat pump with the soil collector uses the constant soil temperature not only for the heating of the house and sanitary water but to a certain extent also for the cooling of spaces. Along with the already stated advantages, all the benefits described in relation to the “soil – water” heat pump also apply to this type of heat pump.

“Water – water” heat pump

As a thermal source and given its constant and relatively high temperature, underground water ensures the highest utilisation of the heat pump and its independent functioning throughout the whole year. The main condition is sufficient amount and the chemical adequacy of the water in the building's surroundings. The “water – water” heat pump is intended for the heating of the building and sanitary water and to a certain extent also for the cooling of spaces. It functions similarly to the “soil – water” heat pump, except that it uses the temperature of underground water for heating and cooling instead of the soil temperature.
Photography of the “water-water” heat pump


 Heating with a compact device


When dealing with the construction of passive or active buildings, the need for low-temperature heating surfaces (floor, wall or ceiling heating) is no longer a requirement, as complete heating is provided by a compact device that combines a heat pump and a comfort ventilation unit with a heat exchanger in which the used air that is passed outdoors emits a great deal of its heat to the fresh air being passed into the building. This is a device that combines all the necessary heating/cooling elements as well as the elements for ventilation and sanitary water preparation in a passive or active house. A passive house requires very little energy for heating, allowing the heating to be provided simply through ventilation whereby the compact device, functioning on the principles of the “air – air” heat pump, assumes the heat of the waste air and heats the in-going air for ventilation (in the summer, a reverse system is applied for cooling).