Insulation: the invention of a water-filled window for passive heating and cooling of homes

After the invention of Water Wall by AllWaterdeveloped by the WFG team a window prototype that can better insulate houses. It is a double glazed window with a thin water membrane between the two panes of glass. This layer of water absorbs heat from outside or inside the construction. When the water is heated, it is drained and replaced with fresh water. This is done through pipes hidden in the walls, connected to a tank installed in the coldest part of the building.

Does this new technology limit the use of heating and air conditioning?

For a long time, poorly insulated windows prevented the energy efficiency required for passive construction from being achieved. According to architect Matyas Gutai, Glass is an obstacle even in buildings. This material would be responsible for the drop-in thermal comfort and soundproofing. In addition, there could even be a sharp increase in energy consumption. However, the situation has changed thanks to Gutai’s invention of the “water-filled glass”. This new technology can Improving the energy efficiency of buildings also the most energy intensive. In fact, the absorption of thermal energy by water allows:

  • limit the amount of heat entering a building in summer;
  • heat a room in winter.

Therefore, heating and air conditioning systems are used less to achieve excellent thermal comfort.

What are the advantages of the water-filled glass system?

According to British startup WFG Installing water-filled glass windows significantly reduces energy costs. However, savings can vary depending on a region’s window-to-wall ratio and climate. Compared to double glazing, this technology can reduce energy consumption by 47 to 72%. Compared to with triple glazing, we can count on 34 to 61% energy savings. In addition, less heating and air conditioning reduces overall CO₂ emissions. Water Filled Glass technology has many other advantages. This innovative glass has an appearance transparent and clear to let natural light through.

It does not require a specific shade. It is possible to temper the water layer to limit the risk of condensation and thermal discomfort. In winter you can prevent the water from freezing by a third glazing in the window. The cavity between the two outer panes of glass must be filled with argon. In addition, the water film can be heated up to 40°C. Another benefit of this technology is that it potentially acts as a solar panel. It also absorbs thermal energy that can be transferred to the mechanics to produce hot water, for example.

In winter, the water layer is heated, which improves thermal comfort and reduces energy consumption. In summer, the system uses the water layer to absorb heat. Photo credit: WFG (Facebook screenshot)

Who are the designers of the water-filled glass system?

The water-filled glass system is a patented technology developed by Matyas Gutai, architect, engineer and lecturer at Loughborough University. His startup WFG was born in 2020. Gutai was able to strengthen his experience in architecture by working in the research laboratory Kengokuma, at the University of Tokyo and for the Japanese architect Shigeru Ban. In principle, the British startup recommends installing the water-filled glass windows on small buildings. These are the hardest hit temperature fluctuations. Its inhabitants often complain about the great heat in summer and the cold in winter.

Geothermal energy is a recommended system for small buildings that cool down (in winter) or overheat (in summer) quickly.
Geothermal energy is a recommended system for small buildings that cool down (in winter) or overheat (in summer) quickly. Photo credit: WFG (Facebook screenshot)

In fact, the company has developed two pavilion prototypes equipped with this new technology. The first will be built in Hungary and is called Water House 1.0. The second, Water House 2.0, is located at Feng Chia University in Taiwan. In addition, the startup Two commercial projects are underway today, namely an industrial building in Hungary and a residential complex in the United States. Note that the water-filled glass system is suitable for both new construction and building renovations. It is suitable for all types of buildings (residential houses, garden houses, conservatories, solariums, hotels, offices, etc.). More information : water-filled


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