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Hi all many thanks for all your replies and sorry for radio silence - been a few developments this end - rat people have come and laid some bait which is killing them off but the smell isn't a rat smell at all which rules them out.

i was outside the other day where the boiler flume is and it smelt exactly like it did in the drains!! So... I switch the heating off and leave on hot water only... Voila the smell has gone.... So I think I may need to now move this over to the boiler forum to continue the investigation... I've been reading about the condensate trap being empty and allowing sulphur fumes out into the vent pipe.... It's got to be that! So relieved to be able to stop the smell though was driving us crazy! Thanks for everyone's help to date
 
Given what you are saying, i'd advise you to have your boiler condensate pipe checked by a qualified gas reg guy who is also a decent plumber asap.
A badly fitted condensate pipe can suffer from induced syphonage which will empty the trap on the boiler and allow fumes to travel down the pipe.
 
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Hi all many thanks for all your replies and sorry for radio silence - been a few developments this end - rat people have come and laid some bait which is killing them off but the smell isn't a rat smell at all which rules them out.

i was outside the other day where the boiler flume is and it smelt exactly like it did in the drains!! So... I switch the heating off and leave on hot water only... Voila the smell has gone.... So I think I may need to now move this over to the boiler forum to continue the investigation... I've been reading about the condensate trap being empty and allowing sulphur fumes out into the vent pipe.... It's got to be that! So relieved to be able to stop the smell though was driving us crazy! Thanks for everyone's help to date
The really worrying thing is if you are right & the smell is coming from the boiler flue via the condensate drain pipe how can it be detected inside the house ?? that would mean the products of combustion can also be getting in !!!!!

tamz beat me to it !
 
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pants! smell came back today, heating is still off.... there was no water usage from us... wondering now if next door have a condensing boiler that is packing up... kill me now! ha:bigcry:
 

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