Opening Watti Eko Energy Windows

Watti Energy Window is the window of the future The first windows on the market in energy class A++ are suitable for new building and renovation.

Choose the energy class A++ Eko Watti window for energy-efficient building

When you are designing the construction of a low-energy house or a passive house, your choice is a highly energy-efficient and heat-proof Eko Watti window! It is also well suited for renovation when it comes to renovating your home to the highest degree of thermal efficiency.. The aluminium-clad wood structures of the windows withstand perfectly Nordic weather conditions.

Eko Watti improves the resale value of your home

Eko Watti is the first energy class A++ window model on the market. In 2008, we received the INNOSUOMI Award for recognition of high-quality development work on Eko Watti. Eko Watti is a good choice for your home windows, not only because of the reduction in electricity billing, but also because of the resale value of your home: in the future, energy-efficient living will become more and more interesting to home buyers.

The necessary accessories such as blinds and insect screens are mounted in the energy windows at our factory. Read more about window accessories!

Technical information


0.60 – 0.65 W/m2K, depending on glazing.

Sound reduction index (Rw):

43-47 dB, depending on frame depth and glazing.

Aircraft noise insulation (Rw+C):

42-46 dB, depending on frame depth and glazing.

Road traffic noise insulation (Rw+Ctr):

40-43 dB, depending on frame depth and glazing.

Air tightness:

In compliance with standard EN 12207, classification 4.

Rain tightness:

In compliance with standard EN 12208, classification E 900.

Resistance to wind load:

In compliance with standard EN 12210, classification C3.

Inner sash glazing:

Double selective insulation glass with Argon gas.

Outer sash glazing:

Double selective insulation glass with Argon gas.

Inner sash material:

Knot-free finger-jointed pine.

Frame material:

Two sides of knot-free finger-jointed pine.

Outer sash:

Knot-free finger-jointed pine.

Frame external cladding:



Threefold seal.


Financing service

If you need funding for your window and/or door purchase, it is easy to apply. Complete the application on our website, and you will get the credit decision immediately.


If necessary, we will come and measure the window and door frames on the spot. This is to ensure that the new windows and doors will fit your home perfectly.

Home delivery

We deliver the windows and doors securely directly to your site within the agreed schedule. We can also help you when you need windows and doors to your site at short notice: you will get stock products from us even in 1-2 days delivery time. 

Order just the kind of window you need

We design and manufacture the right windows just for your home. This means a tailor-made look, excellent weather resistance and the best guarantees in the industry.