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I did the change. It's now just above the floor standing boiler and into the Flow..I did notice a big change on doing a total refill and that is that the boiler and pump need much more initial air bleeding than the bottom fed position. But that might be nothing to do with which pipe it's into...

Further Googling produced a view that it doesn't matter..https://www.plumbersforums.net/threads/why-does-filling-loop-have-to-be-installed-to-the-return-pipe.105151/ other opinions still welcomed..I don't want to getthis wrong ...

As I'm doing some mods to my sealed CH system I've considered moving the filling loop to a more convenient position. Especially as the Altenic magnetic cleaner kit just fitted came with new loop fittings. At present the loop is behind a heavy washing machine at floor level. The instructions with...

Good points ! I'll prepare an air adapter just in case it's needed for a possible second phase but the other end will still be on the hose to catch a burst of pipe contents - and possible projectiles :) Thanks..I'll let you know next week how it all went ! edit: I've also bought 2 meters of...

In 50 odd years of being a householder I've installed three CH systems using the 2 pipe (15mm) system. All worked perfectly and never gave any trouble. This 10mm plastic pipe scheme looks so scrappy - and inaccessible where the 1st floor is chipboard and the drops are plastered into the walls...

@nigel & Terry..Thanks for the confirmation. At one stage I started top believe it had been installed by an idi00t and was working out how to rip it all out..It was probably installed 20 years ago and is the first time I've ever had a microbore system and knew nothing much about manifolds. I...

To make it clear what I'm asking..here's sketch of what I suspect (or hope it's like) Manifold by roger smith posted 3 Oct 2019 at 11:45 AM

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Half of the rads on my 10 rad system are not working and I've turned the system off prior to draining and flushing the 10mm plastic pipes. For the first time ever I have just looked closely the the 28mm manifolds and got very confused ! The are two, red painted, brass 28mm manifolds with 12...

Can't thnak you all enough..saved me a call out charge..I know the thread started long ago but I soon found it when I let the oil run out and then it wouldn't start. FAt first I didn't even know what the oil pump even looked like...and was a bit worried about all the "P's" to choose from, It...