warmflow oil fired boiler water connection question

[Rabmcgo]

Was planning to fit an open vented system and bought a second hand boiler which has 3 22mm connections , can anyone explain these as I think I only need 2 for the rad circuit.
Thanks in advance

 

[dcawkwell]

sound like the boiler had two flow connection possibly one used for gravity hot water. cap one off if using fully pumped system.

 

[Rabmcgo]

Thanks dcawkwell , how would I identifi which one to cap ? Theres 2 on the lefthand side and on the right hand side the drain is on the bottom with the other 22mm on top of the boiler.

 

[dcawkwell]

Thanks dcawkwell , how would I identifi which one to cap ? Theres 2 on the lefthand side and on the right hand side the drain is on the bottom with the other 22mm on top of the boiler.

flows come out top of boiler return will be at bottom.