helios411 :
mcnumpty23 :
plenty i would think--says its 23w and about 13 feet head
cant see why it wouldnt do 4 rads
though personally i have 2 pumps that are about 10w in case one fails
Cool, though im not sure what you mean by 13 feet head..
2 things important in a pump--flow rate and head
flow rate is pretty obvious--simple example would be how much water could be moved from one tank to another in a given period of time--usually expressed as litres or gallons per hour
more important is head--as your loop has restrictions that slow down flow--blocks,fittings,radiators etc
think of flow as pushing water fast--but head as how hard it can push it
kind of like the pump you linked is able to push the water hard enough that in a narrow tube the pump could push it 13 feet vertically
hope that makes it a bit clearer