Discuss CH with Microbore bypass loops and proper bypass valve in the Central Heating Forum area at PlumbersForums.net
Thanks Shaun - Screwfix were open today, it was not apparent from their web site - and yes, push fit caps and inserts was the way to go, I figured not messing with the 19 year old manifold connections was preferable...Screwfix
Worst comes to the worst 10mm push fit cap ends and inserts
If the boiler is at 26% output then only running at 4.94kw and a flowrate of 3.37LPM!! If that is correct then something seriously amiss. Is the DHW cylinder heat up time OK.Not sure what make it is...
But - stop ends fitted and I now have 20-25C drop on the return - It was 10-12C before BUT the boiler is sitting at 26% modulation with 72C flow, 51C return and still not getting much flow it seems...
Thanks for help and advice everyone and kudos for screwfix being open today - I think I need to start a new appropriate topic for the boiler!
Yes - Cyl seems to heat up fine - all 22mm between boiler and cyl, predictably...If the boiler is at 26% output then only running at 4.94kw and a flowrate of 3.37LPM!! If that is correct then something seriously amiss. Is the DHW cylinder heat up time OK.
Hi Shaun, yes, the plumbers who fitted the boiler really don't like the push-fit and I can see why, having seen the little holes in the inserts... Unfortunately cheapskate Persimmons pay installers by the number of houses they complete, so quick and dirty is very much what you get. I was really hopeful that blanking off the loops was going to fix it all, but still some work required it seems... I'll keep the system pumping through the worst rad in the daytime for another couple of days and see how much more gritty gunk comes out I think..10mm gets blocked very easily sounds like you need to start looking at maybe a blockage at the inserts
Hi Shaun, yes, the plumbers who fitted the boiler really don't like the push-fit and I can see why, having seen the little holes in the inserts... Unfortunately cheapskate Persimmons pay installers by the number of houses they complete, so quick and dirty is very much what you get. I was really hopeful that blanking off the loops was going to fix it all, but still some work required it seems... I'll keep the system pumping through the worst rad in the daytime for another couple of days and see how much more gritty gunk comes out I think..
Thanks for your help and suggestions - Screwfix today was a real bonus
The boiler only goes to 60% even with 30C drop when I put more rads on - I feels like it's trying to be too efficient and if there was more flow, the boiler could ramp up more, like the old one did.They will be straight runs so worse comes to worst remove from the manifold clean the inserts if blocked and do the same at the rads and all should be good
Easy way to spot them if any rad is very slow to heat / doesn’t
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