sploo
Somewhat extinguished member
We've got a mains pressure hot water system that was installed just before we moved into our current property (circa 2017). The whole house was completely renovated so has new plumbing throughout.
Unfortunately the hot water system eats expansion tanks for breakfast (we're on our third already) and is now making deafening howling sounds when water is drawn.
Pipe A in the image below is the cold water feed up from the ground floor.
Pipe B (coming from pipe A) is (I assume) supplying cold water to the bathrooms on this (first) floor.
Pipe C is the hot water coming down from the top of the cylinder (not that clear with the angle in the photo).
Pipe D (coming from pipe A) is the cold water feed to the bottom of the tank, and also goes round the back of the tank to the expansion vessel in the right of the photo.
Finally, pipe E is the overflow with tundish, going out through the external wall.
When we draw either hot or cold water upstairs, or when we draw hot water downstairs, the system howls like a banshee. I'm assuming this will be an issue with pipe A as that's the only one in which water would flow in all scenarios (upstairs cold water from A to B, or refilling the cylinder from A to D as hot water is drawn). If I reduce the water flow in pipe A using the valve lever at the bottom left of the picture I can reduce, but not eliminate, the problem. Anyone got any suggestions as to what's wrong (and how I'd fix it)?
Also, the "tank killer" seems to destroy expansion tanks for fun, and almost whenever we have the hot water or heating on there will be a steady (over)flow of water down pipe E and out onto our drive. A new expansion tank fixes it for a while, but not for long. Is there a way to prevent it from happening (once we have - yet another - new expansion tank)?
Unfortunately the hot water system eats expansion tanks for breakfast (we're on our third already) and is now making deafening howling sounds when water is drawn.
Pipe A in the image below is the cold water feed up from the ground floor.
Pipe B (coming from pipe A) is (I assume) supplying cold water to the bathrooms on this (first) floor.
Pipe C is the hot water coming down from the top of the cylinder (not that clear with the angle in the photo).
Pipe D (coming from pipe A) is the cold water feed to the bottom of the tank, and also goes round the back of the tank to the expansion vessel in the right of the photo.
Finally, pipe E is the overflow with tundish, going out through the external wall.
When we draw either hot or cold water upstairs, or when we draw hot water downstairs, the system howls like a banshee. I'm assuming this will be an issue with pipe A as that's the only one in which water would flow in all scenarios (upstairs cold water from A to B, or refilling the cylinder from A to D as hot water is drawn). If I reduce the water flow in pipe A using the valve lever at the bottom left of the picture I can reduce, but not eliminate, the problem. Anyone got any suggestions as to what's wrong (and how I'd fix it)?
Also, the "tank killer" seems to destroy expansion tanks for fun, and almost whenever we have the hot water or heating on there will be a steady (over)flow of water down pipe E and out onto our drive. A new expansion tank fixes it for a while, but not for long. Is there a way to prevent it from happening (once we have - yet another - new expansion tank)?
![water.jpg water.jpg](https://cdn.imagearchive.com/ukworkshop/data/attach/165/165565-water.jpg)