3 Extra Rads after Loft Conversion. Bigger Pump Needed?

[polly_x]

Hi, just had a loft conversion completed with 3 new rads installed (2 rads and 1 towel rad) The Rads are about 1.2m long by 500mm high.

Its a system with a header tank and the rads are bleeding through fine so I believe the tank is high enough.

The rads dont get as hot as the others in the house and I have tried turning the flow down to other rads in the house.

Currently has a Grunfoss pump fitted. It has a Red Body and is class H. Other numbers on it are UPS 15-60 and TF110. It has a switch with 3 settings and is currently on 3.

Should I be thinking of fitting a bigger higher flowing pump now with the extra demand from the new rads or does the system need some extra pressure and bleeding again? There does seem to be some air getting into the 2 new rads but this is getting less each time I bleed.

Any info much appreciated.

Thanks,

 

[bengasman]

very unlikely you need a bigger pump. depends on how many rads in total, not how many rads added

 

[polly_x]

very unlikely you need a bigger pump. depends on how many rads in total, not how many rads added

There are 16 in total.

7 on Ground floor
6 on Second Floor
3 on 3rd Floor

Pump is on second floor.

Is it just a finer art of balancing them better?

 

[bengasman]

Either it needs balancing, most system do, or sludge in pipes and rads, most open vents have

 

[polly_x]

Either it needs balancing, most system do, or sludge in pipes and rads, most open vents have

Will give it a good flush out then and then balance.

Thanks for the help.

 

[corgiman]

or your boiler could be too small