hum noise pipes

Hi, I've noticed that over the past few months that when the water pressure reads at around 0.5, when the heating (gas central heating) comes on the pressure changes to about 2. Is that a normal jump in the reading? I dont remember tracking it before, so I'm not sure how long its been that...

Hi I’m wondering what these pipes are? We moved into a bungalow and there are two pipes that go from the ground outside to just above the roof, there’s one out the back and one round the side of the house. I’m wondering what they are? And could they be making a strange noise? I’ve heard a weird...