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If you can, buy one with a rubber seal on it, just tighten it up. Probably you'll have to buy brass ones and get some PTFE tape (or '12 wrap'), wrap this 12 times (now you know why :wink: ) around the thread (anticlockwise as you look at the bleed valve) and tighten.... You prob know you...

Tap spanners exactly as you suspect from plumber merchants... Ah, too slow :oops:

I managed to detect a leak recently because i could hear it, very faintly anyway, as a hissing sound from the raidator in that room....still had to dig up the floor and trace the pipes, first elbow i came too had 2/3 mm of pipe inserted and soldered..... Apperently the guy who installed it...

Main thing to look for is an installer with an unvented qualification card...

For sure...thanks for clarifying that muggles,

If no hole, it should pull off, but they are hard to push on so will obviously take some effort to get off... good luck :wink: (just understood previous post....waffled a bit :oops: )

Going back to property t-row so will check gate valve and mains stop valve....but supply to house is lead so looks like is being strangled by insufficient bore pipe.... Agree a suprise tho as my flat just 2 streets away has way in excess of 22 ltr/min, but has 22mm in flat with mdpe supply...

Make sure the lead is burr free after you cut it, lead lock depends on a rubber o-ring as part of the seal, cut this with a bit of sharp lead and your sunk till you get a new o-ring..... Basically, get a spare with the fitting!

As unvented are designed for about 18 ltr/min +.....wondering, what happens if installed on a system with much less flow....is it just that there's then no benefit over a conventional vented system or is there a performance downside??

Thanks D_, that's very heavy (hence the long response time :oops: !) but spells out the answers i was looking for.... Now i just need to work out what to do about the customers desire to have a combi in a 4 bed, bath and en-suite and only 12 ltr/min at the mains.....think i know what the...

Use a cut-in, a bit like the DIY 'add a washing machine feed to existing pipework' deal but with a drain tap on it....may leak a little, but a timesaver for sure! 8)

Thanks Norcon, i'll look those up.

Uh oh....don't start me on things i should to admit....it'll be a long and painful experience for all concerned :wink: Thanks for you informative previous post D...I am new to this area of heating science(?) but as more people/customers get concerned about the environment or, more...

This is great news....any further details??

No, i have not yet bought a boiler, i'm quoting for a customer and usually do WB... I'll look into the Valliants....cheers simon :D

Ah, so not possible to use w/c with 42cdi at all??

appreciate 42cdi has no weather optimiser Have had my mind kind of set that perhaps in domestic uses at least this is not so usefull, if boiler is told by room stat to fire until say 18 celcius is acheived, does the boiler really have to care if it's 18 or -18 outside, it still has to fire to...

Thanks for all the above responses... Boiler is a W-Bosch 42 cdi...actually after chatting to a few people about who were able to offer good info on these controls they don't really seem to offer much more benefit then say..extra insulation.....especially with the W-B range (and others i'm...

I'm looking into a system which firstly gauges time required to reach heat and adjusts intial firing times for the boiler to acheive required room temp, and secondly does this while accounting for external temperatures. The aim is to maximise the efficiency of the boiler run times. I have...