another problem could be the location of the vent in relation to the pump ie you have the pump, with the direction arrow is the vent pipe above or below it.
first things first, the bigger picture needs to be taken in to account. america is one of the biggest pollutant if not the biggest. so before going to the extreme on an appliance in this country, which requires to be run at a 100o/o before it becomes effective. maybe they should persuade the...
call in to plumb centre and pick up a pack of 3/4 olive's. or call in to your local plumbase and pick up a 3/4-22mm endfeed coupling. no i don't work for either :)
http://www.hmso.gov.uk/ and then type in your search. unvented will come under the building regs. if you put in water regulations, you'll have have to trawl through them, or you can try http://www.wras.co.uk/ and purchase the wras guide which has put it down in laymans terms. also has coloured...
i doesn't matter, any work carried out on the appliance ie renewing altering replacing, you need to inform the as per the regs. a good guide is the wras guide book. all in there, and its got colour pictures.
not being funny, but this was all new to me when i got sent on the unvented course. its illegal to install a system over 15ltr unless you have done the course. also you are supposed to inform the local authority of what you are doing ten days before you carry out the work, unless you are self...
are you shore the pressure vessel is holding its charge. the way to check is switch of the electric, then the water. reduce the pressure then put a tyre pressue uge on this will tell you what is reading. just to make sure.
i get the idea kev, that you don't like them :?: at lest the welsh prevented the french from gaining a nother victory. not that makes me feel better, being english.
cheers. thes appliance don't require another sperate check valve as well as the intergrated one do they. just that i have seen older versions with them.