central heating headache

jasonw · Jan 10, 2010

Hi all
I am having trouble getting all rads hot.
Rads hot upstairs open 1 to 1.5 turns. downstairs are fully open but luke warm. when the hot water is used and needs reheating the downstairs rads become cold. I have tried closing all rads bar 1 which is fully open and becomes as hot as a rad should be then open a 2nd rad and the heat seems to be shared but never gets to full temperature.
boiler worcester bosch 18 ri
pump 15-60
house 3 bed semi 4 rads up 3 rads down.

Any help much appreciated jasonw.😕

miajanjua · Jan 10, 2010

Pump may be on the way out

jasonw · Jan 10, 2010

thought the same so changed the pump 2 weeks ago

Plucky · Jan 10, 2010

Unless system is underpiped then you should have no trouble balancing that.

Look for other causes, airlock perhaps?

doitmyself · Jan 10, 2010

jasonw said:
boiler worcester bosch 18 ri
pump 15-60
house 3 bed semi 4 rads up 3 rads down.

It sounds as if your system has not been properly balanced.

However:

An 18kW boiler sounds a bit big for seven rads. I would have expected a 12-15kW.

A 15-60 is probably too large a pump for seven radiators. What speed setting is the pump on?

jasonw · Jan 10, 2010

doitmyself said:
It sounds as if your system has not been properly balanced.

However:

An 18kW boiler sounds a bit big for seven rads. I would have expected a 12-15kW.

A 15-60 is probably too large a pump for seven radiators. What speed setting is the pump on?

The pump is on max i changed it from a 15-50 just in case there was'nt enough pressure.
As for the boiler i will be getting 2 extra rads fitted in the warmer months.

What would be the best way to balance the system? i have closed of the upstairs rads to 1 to 1.5 turns and it still dosent send much heat downstairs.