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yes, this is what the manufacturer recommended. It's a horizontal rad that's basically a big tube at top and bottom, with an array of verticals between. The outgoing vertical steel ones had flat vertical channels, this one being aluminium has good size round-section vertical tubes with fins...

Thanks, no tbh I haven't. It doesn't have a low loss header. I've improved the pipe layout to this new rad so I'm hoping it'll be ok. The rad itself has big waterways and I've plumbed it diagonally. But if not, yes a separate pump could be the answer, thanks for the thought.

Oh and no I haven't tried tried to measure up the rads, but they are probably more than 40kW. The old system had 2x28kW boilers, but also a huge rad in the conservatory :)

Hmmm well it's off atm, my dodgy memory is there are simply 5 speed settings and I just click through them on the display. Edit, I see now there are 3 speeds I, II and III plus 3 little charts. I lazily haven't really explored these just used I and II. It's a Magna1. 2 wires to the boiler...

That's encouraging Eric, thanks. Interesting system you have and we have trodden quite a similar path, with a modulating boiler and smart TRVs. Balancing as you say has been a long running exercise. When we moved in all the lockshields were just open 1 turn, bit of a disgrace! 2 boilers...

It's a Magna 32-100. On a 35mm pipe

Lol, yes life is a voyage of discovery after all! My house has way too much dubious history as well. Go for it, and all the best! (y)

Ah, thanks. So 2M equates to about 0.2 bar, in your earlier calculation. I asked Grundfos what they'd recommend and so I've now got a mother of pumps that, so far, I haven't turned up above 2 out of 5 :) It did drive the old rads on 2 but there was just a bit of flow noise. So with your...

Thanks, what's the unit M you're using?

Well the pros like Terryplumb are a better guide than me, and it was a long time ago. My memory isn't too reliable but as far as it goes I think I just fed the flow through the pump ports, plugged it in and that was it! The flow itself switches the pump on and off, so it can go anywhere. I...

Thanks for this awesome reply. What would you think would be a normal kind of dP? And yes I take your later point two rads would have two sets of valves.

Thanks, I know what you mean. However I have balanced the system with the old rads. There are 24 rads (I think) and the boiler is in the annex!

I put in a shower with a pump, as a DIY-er, and it was pretty straightforward. Then the flow switched it on and off and we never had to think about it. The shower experience was well worth it, made me glad every morning! Like you we had an open tank in the roof above.

Hi all, I'm fitting a big fat aluminium 3.4kW radiator. It's on the end of a very long system, which is piped 35, 22 and then 15mm for the last 5m. The old two radiators it's replacing barely got enough flow, until I fitted a big pump and turned it up so the system was a bit noisy. So now...

Thanks opps yes good point about letting it go off, that is what I'll do . I've added some more PTFE and lsx and it's about as tight as it can be so fingers crossed

I have some of that thread too opps, thanks for reminding me about it. My idea about LSX is that it's a jointing compound and sealant, that would be fine internally but can be slapped on externally if you're stuck, which might be when the constant pressure issue kicks in, but I'll double check (y)

Thanks so much Jackrae for that comprehensive solution. The adapter is not properly engineered is it! I'll have a look through my box of bits, check out Atmos-Pate and see if I can infringe your copyright :mrgreen:. If not I'll give the LSX a go and hold this in reserve as the ultimate...

Thanks Terry. I have some LSX so I'll dismantle and add some of that and more PTFE. Appreciated :)

Hi everyone. I'm fitting a CH towel rail, with an elbow angle adapter to take an electric element as well as the water. There's no taper on the thread, so the adapter screws in until the thread ends. At that point, the pipe connection is pointing out into the room, which is no good of course...

Okay thanks everyone, that's what I needed. I will drill the new hole :)