buying a central heating pump

[bottle04]

hello everyone, i am today resigned to the fact that i must purchase and fit a new central heating pump . now i dont know which one to buy so am asking for some advice. wickes do a silo pump.one is 5mm for £35 and a 6mm for £45 are thes any good and what does the 5mm and 6mm matter please help if you know thank you

 

[jameshayes]

property size/boiler requirements.

existing pump has a data badge on it what does this say.

 

[bottle04]

property size/boiler requirements.

existing pump has a data badge on it what does this say.

i seen the badge what specific info am i looking at i cant see any 5 or 6 on it its an old myson

 

[jameshayes]

newer myson pumps state cp53 or cp63

53=5m
63=6m

or tell us about your system.ie boiler name model, number of rads,how many floors,size of pipework around pump,
putting a 6m pump into a smaller system is not much of a problem as speed can be slowed down.
other way around can cauce problems.

 

[bottle04]

newer myson pumps state cp53 or cp63

53=5m
63=6m

or tell us about your system.ie boiler name model, number of rads,how many floors,size of pipework around pump,
putting a 6m pump into a smaller system is not much of a problem as speed can be slowed down.
other way around can cauce problems.

THANKS IT SAYS CP53, are silo anygood or shpild i aviod?thanks

 

[jameshayes]

i only fit grundfoss pumps.
grundfoss 15-50 is their 5m head pump.

 

[bottle04]

i only fit grundfoss pumps.
grundfoss 15-50 is their 5m head pump.

thanks fornyour help james i m on the hunt for me pump cheers