system boilers

[am3]

hi just been to view a job in a 4 story house. the top rads are stone cold. the top floors is well above the capabilities of the current system pump 6/15 . can anyone recommend a system boiler that either has a no intregral pump so i can fit my own more powerful one or a boiler that has an integral pump that will cope with the 9-10 metres of height?

 

[justlead1]

Hi. Are you sure its a pump problem?

 

[am3]

the system is pretty clean an cant think it would be sludge on the top floor. also the height of the building is about 8 metres plus