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combi will most likely have an aav fitted. as above aav's have a tendency to leak of debris catches under the float/seating. if system has filled okay and not air locked then great. usually less of a problem on sealed systems than open vented, however that doesn't mean that having no air...

have a look at agile's bucket method in the wiki page(?). Don't drain down!

just a quick one based on this, without meaning to hijack post. how would others classify this situation of they came across it? AR or I.D.

apart from any blr manu voiding your warranty and issues over the gas safety regulations regarding the suitability of the flue. at 9 yrs old your old boiler was probably standard efficiency. Your new boiler should now be a condensing high efficiency model. In which case your existing flue will...

can't be, we've got a monopoly on them.

could be blr had started modulating by time gas rate taken? don't know viessman commissioning so don't nkow if can be put into forced high.

that was tangled knackers

you need to drain of htg side on blr. close iso's and drain using doc on lhs below pump. leave doc open whilst pressurising vesseland now fill it to between 0.75 to 1bar. close doc, open iso's refill htg , vent pump and you should be okay. As muggles says before you do this I always put some...

do not take pump live from blr switch live terminal in wiring block. pump will need to be fed from blr. Blr will prob require perm live, switch live, neutral, earth and pump live. Neutral and earth for pump can be connected in main wiring block. check blr manual for wiring diagram ur right...

...and large domestic properties. Fair enough. reading the post again it does only indicate that there are only two bathrooms and a kitchen. So yes going for pumped secondary circ would be way over the top. A quick look at the loading units for the hot to a normal kitchen and bathroom...

certainly could be overheating. it could also very easily be the asd working correctly which is the reason behind my previous post.

thats right. ignore the water regulations regarding wastage of water. Morris, off the top of your head do you know what the maximum permited deadleg for 22mm pipe is. Do you know how far the appliance are away? I suspect the answer is no to both.

Potterton puma?

changed gas valve, no good. pilot not working, linked out thermocouple. now dead as 4ked about with stuff I had no idea about. would ask for help but am dead

cold water combination valve on the megaflo has an integral isolation cock on it. yes you can put a isolation valve on the OUTLET of the cylinder.

think you'd be best diggin out treloar's plumbing book. The main jist of which is that it is the head developed by gravity and not the volume of water in a cistern that determines the pressure at a particular point. About only point I have ever really found useful to remember is 10m head of...

beat me to it gasman77. :lol: well done to you sal

if you what appliances are being fed someone may be good enough to do a quick pipesizing calc. depending on distance you may want to put in a secondary return pipe if necessary if the deadleg is too long to prevent unnecessary wastage of water

that would be fair comment gasman if it was of a decent standard. Sorry but if you post a picture as an example of how to bend etc and it's of that standard, your asking for it really.

Can't believe no ones mentioned the greatest gift to mankind ever... Fellatio :lol: