There is no more convincing response to the operation of passive houses from that  which given by the users themselves.The letter below came via email from Lefteris an inhabitant of our new passive house in Porto Rafti. The prefabricated passive house is 150 m2; the heating is mainly from solar panels which heat water at buffer tank for domestic use (DHW) and to preheat the air circulating in the house with a simple air-water exchanger. Also the passive house has a fireplace as backup 9kw. The radiator that referred by Lefteris is a small electric convertor 2kW that places in the living room to not open the electric resistance of the ventilation system which is 3 kW.

Read and enjoy it.

"Regarding the functioning of the house, it is really impressive ! I do not have a thermometer yet but in order to understand i tell you that, we walk around always with shirts and light clothings , we take a bath and we continue to walk around wet without the slightest feeling of cold.

Generally if we have 2-3 hours sun the house works alone. We turn on only at 11pm, the radiator low at 700w, but our little son Bampinos awoke sweaty 2 mornings. Yesterday with the snow at the morning, we had practically only the radiator and we put a light sweatshirt. After I lit the fireplace (turn off the radiator!) and in 20 minutes we came back to summer again all day. The heat remained until the next morning (I turn off the fireplace at 11 o’clock), and today we were with shirts again. (I put again the radiator very low at 6 am).

Besides that the thermal comfort and the warm water is permanent, although we had cloudy days. There was  only  one case to turn on the water heater and that is to have our bath at the same time, or to fill the whole bathtub with very hot water. Yesterday though outside it was 2 0C and cloudy the water when I was looked was up to  45 oC .

As for the ventilation, I have said before, it's fantastic that you do not need to go out for a cigarette, and  we have continuously fresh air . It is very big advantage for a house, 2 times for a smoker and especially for parents.

Finally the layout is excellent. Beyond that helps us to heat the house quickly, the house is so comfortable either there are two people inside or 10. We made and polygon and storage facilities seem to be enough, the ladder has fit everything!

I hope to have given you a full image for those  early days of operation. "


The first prefabricated house almost zero energy consumption nZEB (nearly Zero Energy Building), designed with the philosophy of Passive House realized by the Easy Green in Porto Rafti, Attica. The house is one of the few passive houses that already constructed in Greece (not exceeding 10) and is the first passive house built with the method of prefabrication. It has a ventilation system with heat recovery 81% in combination with a water  - air exchanger which is heated by solar panels.

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This combination except high thermal comfort, constant humidity and good ventilation ensures almost zero consumption for heating. In the ventilation system will also adjust mild geothermal system to cool air in summer and warm air in winter. The hot water will cover entirely from 8m2 solar panels combined with a buffer tank 500lt. The construction of the house will be completed in about 40 days.