Thanks for sharing Al. Heating Engineer here 50 plus years in the Trade & totally agree with your sentiments. Oh, we made a Klondike back in the day with Microbore, thrown in, any size Radiators, any size runs of Tube. But we were young & foolish, so, there’s plenty still living with our poor workmanship. However, they can rest assured we were minted, we would drive around in brand new Capris, Kipper Ties, 3 piece suits & Platform Shoes, pulling all the best birds.😂😂❤ All the other Tradesmen took the Bus😂😂 But seriously, 8 & 10mm tube has very little heat carrying capacity. So it’s always best to Tee off the bigger size Tubes. My advice, Central Heating is an exact science, not a DIY job. Best really to contact your local Gas Safe Plumber/ Heating Engineer to carry out any work. Thanks again Al & pass on my regards to your lovely wife.
Hi Al, interesting video... Moved into a house 4 yrs ago with 8mm microbore system in poor condition with some blocked rads. Good thing was the flow and returns were in 28mm reducing to 22. Had a GSR engineer replace the boiler and (old) thermal store. Spent months cleaning the system out and eventually replaced 9 rads out of 21. Also added one, with very short 8mm runs, upped to 15 into the new rad. Works fine. Also fitted an extra filter on the circuit between the boiler and the store. Learned to solder the 8mm with those tiny fittings😅 I'd definitely agree that cleanliness is key, especially with the 8mm.
Good via Al, didn't know there was microbore systems with a manifold. I have microbore but mine is only from 15mm under the floor to the rads so easy to change everything to 15mm over time or when I get the floor up. Out of the combi is 22mm (well it is larger than 15mm).
My last gaff had micro ore, didn’t have any problems with it, but I found it too hard to DIY it. What I did do once In a while was close rad valves off to force everything through a single rad for a bit, I’d then clean the filter
Basically, if you tee off, with s shortish run, a small rad from microbore to another rad, it will probably be OK. Two large rads off the same microbore, especially with longish runs, will be hopeless.
[2.43] My radiators are very different sizes (smallest is nominally rated at 425 watt, biggest is 2110 watt) so the microbore system is very unbalanced anyway. Would teeing off the pipes to the smaller radiators be OK?
Your heating posts always ‘trigger’ me - to use the modern parlance - to go away (again) and spend a week trying to really understand our heating system. We have old style F&E, but with a 1910 bit of house merged with a yr 2000 bit of house, with micro-bore (mostly) in the old bit: buried in the walls, popping out of nowhere into a rad and disappearing back to nowhere. It’s Indiana Jones and the Lost Manifolds in our house! Never seen one. I guess they’re under the floorboards somewhere! Summer project (with all the others).
Great to see info on microbore - after 40 years of living with it!
Thanks.
Thanks for sharing Al. Heating Engineer here 50 plus years in the Trade & totally agree with your sentiments.
Oh, we made a Klondike back in the day with Microbore, thrown in, any size Radiators, any size runs of Tube. But we were young & foolish, so, there’s plenty still living with our poor workmanship.
However, they can rest assured we were minted, we would drive around in brand new Capris, Kipper Ties, 3 piece suits & Platform Shoes, pulling all the best birds.😂😂❤
All the other Tradesmen took the Bus😂😂
But seriously, 8 & 10mm tube has very little heat carrying capacity. So it’s always best to Tee off the bigger size Tubes. My advice, Central Heating is an exact science, not a DIY job. Best really to contact your local Gas Safe Plumber/ Heating Engineer to carry out any work.
Thanks again Al & pass on my regards to your lovely wife.
Thanks will do Jim all the best.
Hi Al, interesting video... Moved into a house 4 yrs ago with 8mm microbore system in poor condition with some blocked rads. Good thing was the flow and returns were in 28mm reducing to 22. Had a GSR engineer replace the boiler and (old) thermal store. Spent months cleaning the system out and eventually replaced 9 rads out of 21. Also added one, with very short 8mm runs, upped to 15 into the new rad. Works fine. Also fitted an extra filter on the circuit between the boiler and the store. Learned to solder the 8mm with those tiny fittings😅 I'd definitely agree that cleanliness is key, especially with the 8mm.
Great info thanks Ian.
As always great information and it’s much appreciated, best regards Chris. 👍👍👍
Glad you enjoyed it. Cheers Chris.
Really helpful video, Al ! Thank you for sharing !
My pleasure!
Good via Al, didn't know there was microbore systems with a manifold. I have microbore but mine is only from 15mm under the floor to the rads so easy to change everything to 15mm over time or when I get the floor up. Out of the combi is 22mm (well it is larger than 15mm).
That size is ok Mark.
My last gaff had micro ore, didn’t have any problems with it, but I found it too hard to DIY it. What I did do once In a while was close rad valves off to force everything through a single rad for a bit, I’d then clean the filter
Great tip thanks. Hope you are keeping well my friend.
Basically, if you tee off, with s shortish run, a small rad from microbore to another rad, it will probably be OK. Two large rads off the same microbore, especially with longish runs, will be hopeless.
Yes that`s about the size of it.
[2.43] My radiators are very different sizes (smallest is nominally rated at 425 watt, biggest is 2110 watt) so the microbore system is very unbalanced anyway. Would teeing off the pipes to the smaller radiators be OK?
So long as they are not to far away.
👍
Thanks Celine.
Your heating posts always ‘trigger’ me - to use the modern parlance - to go away (again) and spend a week trying to really understand our heating system. We have old style F&E, but with a 1910 bit of house merged with a yr 2000 bit of house, with micro-bore (mostly) in the old bit:
buried in the walls, popping out of nowhere into a rad and disappearing back to nowhere. It’s Indiana Jones and the Lost Manifolds in our house! Never seen one. I guess they’re under the floorboards somewhere! Summer project (with all the others).
Good luck with that.
First!
Sure are.