Hi people I've put a new radiator on the wall put new chrome valves not thermosatic ones. I've got my pipes coming down the wall but like a idiot never marked flow and return does it matter if they get mixed up.
With the system on feel to see which one gets hot. That'll be your flow. If not... there's always the handcuffing option as above... Just to add, for most rads it doesn't matter which way they are piped up however some of the desiger vertical ones such as yours may have a specific flow and return.
Thats very important,does the vertical radiator come with any instructions ? is there any markings on the back of the radiator,they may be in a foreign language ? if no supplied instructions or any markings on the radiator,ask your supplier