P pingo123 Messages 12 Jun 2, 2020 #1 Hello My new boiler has a built-in AAV. The old AAV in the airing cupboard upstairs is gunked up and not working. I assume there's no need to replace this....? Thanks Chris
Hello My new boiler has a built-in AAV. The old AAV in the airing cupboard upstairs is gunked up and not working. I assume there's no need to replace this....? Thanks Chris
O oz-plumber Esteemed Plumber Gas Engineer Subscribed Messages 3,356 Jun 2, 2020 #2 If the gunked up AAV is higher than the boiler, then it will need replacing. Upvote 0 Downvote