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You're right - just checked manual - ecomax does indeed have by-pass built in...Duh! Oh well, that's good - one less thing to do, then...

hello Chris, back from work, just looked at your reply. Yes, I can confirm that 3m is correct for the lounge rad loop: the 22's come down from upstairs (where the boiler is) on one side of a wall, where at skirting level 15's branch off at 90 degrees straight thru wall to an 1800mm rad on the...

Ok, you've sold me the 8mm idea, I'm gonna do it with 8 and 10 to dining room! Sure there won't be any noise??? The reason the towel rails are in series is because a) ease of pipework/connections due to simplicity, b)couldn't see why they wouldn't work like that - after all, its like making a...

Blimey, Chris, I'm glad I didnt have to work that lot out (for "didnt", read "couldnt"....) - seems pretty complicated! But not now you've explained it.....I managed to put in the vaillant condenser and a megaflow, but without knowing much of THAT stuff...the fact that it all works brilliantly...

Thanks to the two Chris's, very helpful - judging from your replies, I might be ok with my plan...however, having had a measure up, and consulted stelrads web site to ascertain the output of the radiators I've got, maybe not: so here's the (aproximate) figures (pipe length is total of flow &...

Hello chaps, want to change the flow/return pipework to our downstairs radiators from 15mm currently fitted to 10mm (or even 8...?) microbore, to make it easier to "hide" them behind skirtings (solid floor). The system we have at present is a Vaillant ecoMAX condenser boiler, 22mm flow/return...