return temperature

I’ve just had a Main Eco Compact boiler installed and I’m very pleased with it so far but I’ve got a couple of questions that I can’t find the answers to. 1. Does anyone know if there is a way to display the current return temperature on the control panel? I know I can measure it with...

I've always just assumed that the colder the return to the boiler the more efficient the boiler would be (i.e. greater differential so heat transfer through manifold is faster). But I've come across direct evidence to the contrary (e.g. boiler recommends minimum 60 degree return, 'hearth' temp...