The whole process from survey to installation was first class. The heaters themselves look impressive, much nicer than my old storage radiators. But the efficiency I am unable to review on as we had them installed on the hottest day of the year. Hopefully the independent testing results are accurate and I will save money going forward as these units are not cheap !! It would be of great help if someone giving a review on Trustpilot could actually indicate savings they have made on energy bills using these heaters. The staff at Fischer are all very helpful especially David our area company representative. I would also recommend the use of Fischer for energy supply they have saved us money changing from E-ON.