back to basics

hi all, Its my second boiler in 40years.The first was a potterton c55/16,the current one is a potterton kingfisher 2,gravity hot water,pumped heating.The pump was a grundfos super 4-50 single speed.When I tried to adjust the variable adjustment arm it started to leak,so after 40years I fitted a grundfos 15/60 three speed.It dose not seem to matter what speed I use the rads are all hot and plenty of hot water,so I have left it set on one.Now for the basics.If water travels slowly around the system dose it give out more heat,or should I turn the pump up to push as much water through the boiler as possible. Regards bill.

 

You should run the pump at the lowest setting you can that will make your ch and hw function and perform properly. If all is fine on 1, leave it on 1.

Running the pump faster than you need can cause other problems, eg. pumping over, which can severely damage your rads. It will also make the system noisier than necessary.

 

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