Flow and return - swapping connection...

[bassmonster]

Hi all,
Apologies if this seems like a silly question. Does it matter if you swap the return and flow connection? Will the heating work as it should?

 

[jonnyswamp]

Depends what rad valves you have

 

[albatross]

It can also matter if it's a heat only boiler. Boiler/vent/feed/pump must be in correct order to stop sucking in. Some modern boilers with flow switch or return sensors won't fire if water is flowing the wrong way.

 

[ADM360]

As above all depends on what boiler and rad valves you have!

 

[lame plumber]

basically don't even think about it