Installing new plinth heater 10mm pipe

[Gasinspect]

If radiator was piping hot on 10mm, then so should the plinth heater. Manufacturers output calculations for radiators and plinth heaters are based on same parameters. Remember the systems on 8mm!! Look inside a thermostatic radiator valve and the size of the waterway is not even 8mm in many of them. So a short run of 10mm without sharp elbows should not reduce output, any more than it would for a radiator