microbore and a new combi

[ambrosia]

have anyone tried putting a brand new combi on a 15 year old mircobore heating system

was sent to measure up for a quote today, presently has a gledhill boiler mate which isnt working and they dont want fixed, they have no idea where the microbore manifold is, have just had an oak floor put in

theres bound to be a previous thread on this, but i couldnt find one

 

[Chalked]

If its non barrier hop2o I would advise a re-pipe, or walk away. as boilermates are open vented it will sludged up..
if its 10 mm copper and all the rads are currently working. A good power flush will do.

 

[Killy Bing]

Yes, new manifold made up, surface mounted
old one was chocked full of crud
all rads off and flushed.
Chemical clean for the week and dropped the system.

assuming its still fine🙂

if theres the money repipe it....

 

[vern]

If it's copper it may not have any manifolds, just tee's etc, or the micro and mini bore 22mm x 4 outlets caps which are brass

 

[ambrosia]

Powerflushing micro bore alone is worth walking away from

woman has just refurbished house and the builder told her to sort the heating out after refurb

the new oak floor is apparently worth thousands so re pipe is out

cant tell how bad the rads are as the heating isnt working

its copper, I just assumed it had a manifold but not sure really

although the builder did fit a massive rad on standard 15mm by cutting into the microbore, it of cause doesnt work at all

 

[Ermintrude]

Do it lots, not one or two either lots.

Ban in a mag. Wop in boiler. Remove all rads and flush out with a hosepipe. You cannot power-flush micro-bore if it's on a manifold, as you can't see it assume the worst. Connect rad valve to a hose pipe and let water run out - set filling loop to keep boiler at 1 bar, get boiler hot and so each leg of each rad. 10mins per rad. Use hot water to flush rads out too. Hose connected to rad valve at base of rad for water in as vibrate rad till water comes out clean 25mins on a big double is really bad. Rads on gf will be much worse than ff. once all clean ish dose up with x 400 leave for two weeks drain, clean mag and your done. So 2 day install plus 2hrs in two weeks .

 

[AWheating]

tell the custard that if the rads dont work very well they can burn that expensive floor to keep warm 😉

 

[oz-plumber]

Just out of interest, what is the cost comparison - labour wise for removing and cleaning the rads versus just installing new rads.

The rads are obviously old.

 

[Ermintrude]

£48 for an apprentice to flush £150 to supply and fit

 

[Millsy 82]

woman has just refurbished house and the builder told her to sort the heating out after refurb

Sounds like a great builder to me. Probably wanted to make sure there was enough money for him to charge the earth. If they were doing a full refurb they should of had heating sorted first.

Could you not swap the gledhill for a heatstore? Keep it open vented still.

 

[lame plumber]

only install a combi that has not got a plate hex, then that cant block in the first few months either