Different companies sometimes state different heat outputs for the same radiators, why?
This is because some companies, ourselves included, state heat outputs calculated using the original British rating (Delta 60 (Δt 60C)), whilst others state heat outputs calculated using the newer European rating (Delta 50 (Δt 50C )). In our experience, most domestic plumbers and heating engineers still calculate heat requirement using the original British Delta 60 rating. To comply with this and avoid confusion, our heat outputs are also calculated to Delta 60.
