Energy Plus Flush Casement Windows

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Quick Overview

Our flush casement windows have a more modern feel to them; they are all based on the same fundamental engineering excellence that gives these windows their distinct, robust and durable qualities.

We manufacture to your specifications  with a wide range of configurations possible, most popular are fixed pane, top hung  and side hung they are also available as tilt and turn and are available in a range of frame widths

All our Energy Plus flush casement windows have the same technical engineered features technical and benefits, all available in  over 200+ RAL colours, factory finished with breathable micropore paint.

For performance summary click on the 'Technical Info' tab below

Available as timber or Alu Clad

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Ecomerchant Flush casement window

If you are looking for a traditional casement or cottage window design Ecomerchant’s side hung window is perfect.

The made-to-measure, outward opening window is available in Timber or Aluminium-clad with the choice of double or triple glazing in any RAL colour or stain. The glazing can be divided with simulated glazing bars to match traditional fenestration with spacers in the glazed units giving the appearance of solid bars.

 The outward opening window was originally developed for harsh climate conditions in Scandinavian countries. Denmark and Norway have used such windows as the main solution in building practice for hundreds of years.

 The construction of an outward opening window is designed to have excellent thermal performance and functionality during different seasons throughout the year: in high humidity, in dry conditions, when it’s cold or hot.

 Gaskets and insulated glazing units used in the design ensure air tightness and energy efficiency. Built with top grade laminated, responsibly sourced, slow grown timber and the use of tried and tested hardware help to prolong your window's life span, lasting a life time.



Energy Plus Double Glazed Window

  • Thermal transmittance: Uw = 1,2 W/m²K;
  • Sound insulation: Rw (C; Ctr) = 33db (-1; -4);
  • Cross sections: frame 44 x 116 mm; casement 61 x 61 mm; glazing bar 50 x 61, 44 x 61 mm;
  • Pine wood with quality class A1–A3;
  • Wooden profiles treated with water based preservative;
  • Glazing: double glazing (Ug = 1,0 W/m²K);
  • Hardware: PN-Beslag hinges, Fix espagnolettes and handles;
  • Frame dimensions WxH max. 2,5 x 3,2 m;
  • Multilight windows with transoms and mullions;
  • Openable casement up to 2,05 m². 

Energy Plus Triple Glazed Window

  • Thermal transmittance: Uw = 0,97 W/m²K;
  • Sound insulation: Rw (C; Ctr) = 34db (-1; -4);
  • Cross sections: frame 55 x 92 mm; casement 65 x 75 mm;
  • Pine wood with quality class A1–A3;
  • Wooden profiles treated with water based preservative;
  • Insulated triple glazing: Argon filled, two selectives Ug = 0,6 W/m²K;
  • Hardware: PN-Beslag hinges, Fix espagnolettes and handles;
  • Frame dimensions: WxH max. 2,5 x 3,2 m;
  • Multilight windows with transoms and mullions;
  • Opening casements up to 2,4 m²   Max. weight of opening casements: 50 kg with side hung


U values are only part of the story; sealed glazing units provide the lowest component U values within a window, so the most efficient windows will be those with the most glazing and least frame. Introducing frames and opening sashes reduces the overall window U Value and provides an opportunity for cold to ‘bridge’ the structure or allow air (hot or cold) leakage. For this reason the quality of the components, the quality of construction and attention to detail when fitting can have a significant impact on the lifetime performance – and so contribution to the long term thermal efficiency of the building. This is why there are often significant variations in price when comparing - apparently similar- window quotations.

Choosing a window solely based on lowest U values at the lowest price should  not be the absolute deciding factor, after all there are many inexpensive UPVC windows that are independently assessed with ultra-low U values, but there are often environmental or aesthetic reasons why people do not choose them, more importantly is the maintenance of lifetime  performance. Various studies show that over the lifetime of a window engineered timber will provide a cost effective solution when the maintenance of lifetime performance is taken into account. In fact the Herriot Watt study (which you can download from the ‘TECHNICAL INFO’ tab) clearly shows that quality timber windows last twice as long as UPVC windows and are more cost effective over their lifetime

A note on types of U value Uf, Ug, Uw and Ud-Values

As a householder, you will probably be most interested in the U-value for the whole window or whole door, known as the Uw value and Ud value respectively. In each case these are calculated by combining the U-values for the window or door frame (known as the Uf value) and the U-value of the glass (known either as the Ug value or the ‘centre pane U-value’).

U-values describe the insulation ability of a given construction. The lower the u-value is, the better it insulates, thus reducing heat loss through windows. In a window context, it is the window's total insulation ability, including frame and sash, which is relevant. This value is called Uw and is measured in W/m2K.

By using the construction's aggregated insulation ability, all components and materials are taken into account.

Uw is dependent on window size, pane and sash/frame type and dimension. In the UK manufacturer declared U values are typically given for a standard sized window (1.23 m x 1.48 m), but there is also an obligation to provide the Uw-value for the actual window sizes at the customer's request. The exact U-value is crucial information in energy framework calculations.

On facades, where there is only a little chance of solar heat contribution (i.e. north-facing facades or facades in shadow), the best result will most likely be achieved by primarily focusing on the window's U-value.

The total insulation value for the window or door, Uw, is used in calculating the energy frame for buildings, which are typically made by consulting engineers.

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