quick pump question

[djboyd]

Hi, a really quick one........

I need to replace my central heating pump - should i go for a 15-50 or a 15-60? I know it refers to 5m or 6m head but does this mean the amount of head I actually have to the header tank or the amount of oomf the pump will deliver?

Thanks

 

[dontknowitall]

Oomph - most pumps (where I read the front) tend to be 15-60, if that's any help.

 

[tamz]

Without getting technical ...oomf.

Put on the same as you have. Take your pick. Unless you have an old lightweight boiler that needs a high circulation through the boiler, keep the pump speed down.

 

[djboyd]

Hmm, the pump is about 20 years old and not a grundfos - no mention of capacity. Is is not broken, but since i am adding rads and i run a back boiler off a coal fire too (so lots of heat) I want to change it before it breaks. I need one that'll cope with 13 rads.

 

[dontknowitall]

13 rads and I'd definitely choose a 15-60.

 

[djboyd]

Thank you, the forum is an excellent source of all things plumbing!