adding radiator

[hammerstones]

i'm adding a new radiator in bathroom which has the valves that flow both ways, i intend connecting it up to the 22mm flow and return pipes, because the valves are bidirectional does it matter which flow and return pipes i connect to. if so which. thanks

 

[Bahco]

Can connect to either end no probs.
Might be bypass issues though.

 

[hammerstones]

thanks bahco, but what do you mean by that

 

[Bahco]

Sorry, a bit lazy tonight.
Does the rad you are changing already have a trv on it. Sometimes bathroom rads do not have a trv and acts as a bypass so that the water has somewhere to go if other trvs shut down.

 

[hammerstones]

job done, radiator added, no leaks and it gets warm. However hot water from combi boiler runs hot for a while then gets cold, burner appears to be lit ???? any ideas??