The window, dubbed EnerGoWindow, functions as an energy-efficient electric radiator and can serve as primary heating for a home as long as 20-30pc of the area has window exposure, EGW Investment founder László Szentesi said.

EnerGoWindow maintains all of the other functions of a conventional window: it can be opened, the glass is non-reflective and it can be fitted with curtains, he added.

Production of the windows is starting at a plant in Veszprém (96 km southwest of the capital).

Szentesi put the cost of developing EnerGoWindow and starting production at around HUF 100 million. This year, EGW Investment targets revenue of HUF 400 mln-500 mln, he added.