U Value / WER Calculator
Welcome to the REHAU Online Thermal Calculator
This calculator is an easy to use tool which will demonstrate the energy efficiency of REHAU systems. This program has been designed to calculate the thermal transmittance (U Value) of windows and doors following the principals of BS EN ISO 10077-1 using REHAU window profiles.
This calculator also provides a Window Energy Rating (WER) indication based on the conventions and methods outlined in the Approved Document L.
This program will allow the user to demonstrate compliance of installed windows and doors with Building Regulation Part L following the guidance rules as set out in L1B section 4.20.
Use of the BRE 443 Standard Window will enable the user to calculate the U value and the indicative Window Energy Rating (WER) value based on the guidelines as described in the Building Regulations Part L.
The other options available will enable the user to calculate U values for specific sizes and styles of windows and doors.
Further information can be found in our user guide.
If you have any requirements which are not covered within this calculator tool or you have any questions relating to its use please contact enquiries@rehauanswers.com
For a full range of products for your home, please visit www.rehauhome.co.uk
Recognised By
WER / U Value Calculations:
BRE Standard Window
U Value Calculations:
Windows
U Value Calculations:
Doors