Looks redundant then in that case but best to check.
Yes you can run your boiler and look at the flue outside. The old pipe in question is hanging above your hot water cylinder. In any event your gas boiler should be serviced annually by a Gas Safe engineer.I have had a look and I'm fairly certain that my boiler has a fairly large vent coming out the back and venting out the back wall. Is there a way I can test this, for example if u run my heating will I see any gases exhaust out of it? Also, as I said all I have in the house is gas boiler and cooker and hot water cylinder so if it is not connected to any of these is it safe to say it's not in use?
If you have a gas fire in the house you could turn that on
give it five min and then go up and check if any heat is coming out.
Guys guys guys, reality check; you're going round in circles just speculating.
It's the flue from an old hot air system boiler. They went up through the house, and when you take them out, you end up with a small cupboard space that the tanks gone into.
As they are away use a hairdrier ( unless they both have taken one each ) to blow warm air into the end of the pipe in the cupboard, then see if there is warm air coming out of the end of the pipe in the loft.My wife and daughter are on holiday at the moment so luckily I don't have to worry about them being in the house. I'll try and do some further testing tomorrow,
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