cold rads

[geoffinitial]

moved into a 3 bed house with a Worcester Greenstar boiler 6 years old. 2 rads at end of the system in new extension (6 years old) wont stay hot. Gas engineer been out 10 times +, fitted new pump, drained system, balanced rads, bled rads, pipework to pump re-routed etc. etc. Engineer turns off all rads except these two and they get hot. others turned back on, and all seems fine. System tested every time and rads nice and hot when he leaves, but within 1 hour go cold and stay cold. Engineer doesn't seem to know what to try next, suggested powerflush although when system drained water is clear.

are we stuck with this forever? - help /suggestions welcome

 

[Armo74]

I would suggest a little more time is spent balancing.

What is the pump speed set at?

 

[Agile]

Often rads ion conservatories/extensions are fitted to 15 mm pipes serving rads in the adjacient room.

That then means there is insufficient flow to the furthest rads!

Careful balancing can help.

Surprisingly I would say that about half of plumbers are not very good at doing balancing.

Its a simple DIY job using the instructions in this site's FAQ.

Tony

 

[geoffinitial]

digital pump has 3 settings, currently at no 3 = 45

we will look at help pages re rebalancing

thank you

 

[geoffinitial]

Have looked for the help pages on how to balance rads but can't find them. Am new to the site so any link/further help welcome

 

[Armo74]

Click on the wiki at the top of the page then click on plumbing and heating then FAQ's

 

[Armo74]

 

[tincup]

Hi

If possible, check that there are no more than three rads on the leg as pump pressure would be almost lost when all the rads are on.

HTH