IanB 0 Posted May 4, 2012 Report Share Posted May 4, 2012 Need some advice guys from any plumbers on here... I'm unsure whether to change my central heating pipes.. Currently I have a 15mm copper supply and return manifold upstairs feeding 8mm copper microbore to each radiator.. Should I go the full hog and change it to 22mm supplies using plastic and 15mm plastic feeds to the radiators?? Quote Link to post Share on other sites
fredthefrog 169 Posted May 4, 2012 Report Share Posted May 4, 2012 ye then weigh copper in to get some return on funds spent..all the best in the venture......im not a plumber but it sounds good to me.....lol Quote Link to post Share on other sites
moonlighter 1,164 Posted May 4, 2012 Report Share Posted May 4, 2012 Most new builds use micro bore now. Why do you want to change yours? Is there something your not happy with? Quote Link to post Share on other sites
weasle 1,119 Posted May 4, 2012 Report Share Posted May 4, 2012 Dont fix whats not brocken.Are you having trouble with it.I have known it get blocked with sludge and rust. Quote Link to post Share on other sites
SEAN3513 7 Posted May 4, 2012 Report Share Posted May 4, 2012 It'll be fine ian , more efficient with microbore , not as much heat loss Quote Link to post Share on other sites
SMART DOG 340 Posted May 4, 2012 Report Share Posted May 4, 2012 I'm a plumber and plastic looks shit if you have no problems I wouldn't touch it Quote Link to post Share on other sites
weasle 1,119 Posted May 4, 2012 Report Share Posted May 4, 2012 I'm a plumber and plastic looks shit if you have no problems I wouldn't touch it The white pex can look good if its done well. Quote Link to post Share on other sites
SMART DOG 340 Posted May 4, 2012 Report Share Posted May 4, 2012 I'm a plumber and plastic looks shit if you have no problems I wouldn't touch it The white pex can look good if its done well. yes when you don't see the fittings Quote Link to post Share on other sites
SEAN3513 7 Posted May 4, 2012 Report Share Posted May 4, 2012 And it sags when its hot , can cause air locks.....i try and avoid using it whenever possible Quote Link to post Share on other sites
Mustard. 83 Posted May 4, 2012 Report Share Posted May 4, 2012 (edited) . Edited May 4, 2012 by Mustard. Quote Link to post Share on other sites
IanB 0 Posted May 4, 2012 Author Report Share Posted May 4, 2012 Most new builds use micro bore now. Why do you want to change yours? Is there something your not happy with? Some of the radiators have these dual fittings for the microbore supply and return on one end http://www.yorkshire...0a-f828287640f0 Also the main upstairs manifold is 15mm, I think it really should be 22mm in an deal world. Theres 4 radiators upstairs, but I could possibly add another two. The four radiators are fed off the 15mm pipe with a 22mm expander fitting to one of these style manifolds.. http://www.toolstati...ebbig/12184.jpg It would be easier to extend the 8mm microbore returns so I have individual supply return fitting on radiators, but my doubts were, what if I add another two radiators and the existing main supply/return is 15mm, also I was thinking a better flow with 15mm throughout for rads and 22mm manifold feed. I've had no problem with the micorbore and could just add a compression fitting for extra length on the return for each radiator...but I was thinking long term and with the additon of an extra two rads on 15mm supplies, maybe not enough flow??.. Quote Link to post Share on other sites
SEAN3513 7 Posted May 4, 2012 Report Share Posted May 4, 2012 Twin entry valves are ok , but im not sure you can get the repair "o" rings for them now....if they ever leaked , probably best to ditch them and start again , as you said 22mm feed then either 10 or 15 to the rads Quote Link to post Share on other sites
stealthy1 3,964 Posted May 4, 2012 Report Share Posted May 4, 2012 Sorry, missread the question Quote Link to post Share on other sites
IanB 0 Posted May 4, 2012 Author Report Share Posted May 4, 2012 Twin entry valves are ok , but im not sure you can get the repair "o" rings for them now....if they ever leaked , probably best to ditch them and start again , as you said 22mm feed then either 10 or 15 to the rads I was going to go for 22mm feeds then 15mm to rads using manifolds.. I looked at these but supposedly the 10mm plastic speedfit is just the same ID as 8mm microbore, so defeats the purpose. http://www.screwfix....mm-x-10mm/73609 So then I looked at these going to 15mm manifold which looks better http://www.ebay.co.u...=item27ae27d627 My only reservation being, I'm going to need to use loads of 15mm right angle fittings as I don't think the pipes will bend sharp enough...What are these plastic fittings like for leaks?? Should I just stick with my 15mm supply and 8mm microbores upstairs.. Quote Link to post Share on other sites
SEAN3513 7 Posted May 5, 2012 Report Share Posted May 5, 2012 Fittings are good , very reliable , the 15 mm bends to about a 6" radius , dont know if thats enough ? Personaly , I would go for 22mm x 10mm manifolds.........10mm to all rads , converting the valves to each end to improve circulation, the existing twin entry valves have an injector pipe that over time corrodes and drops off , resulting in poor circulation. you should be able to fit the 10mm without having to use bends , or maybe I need to have a busmans holiday ?? Quote Link to post Share on other sites
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