D
Dotty
Sorry stating the obvious, but - How do they figure out the vent pipe is risk of Legionella?
I guess they theory is the pipe is open to the atmosphere and the water inside it is heated to some extent. Storage tank water is exactly the same anyhow.
I would be careful about putting the vent to elsewhere where it could freeze or the hot water damage something. The end of vent pipe would need to be not too low or it would start a syphon and empty the cold tank.
Probably through a build up of scale on the end of the pipe.
Worries me that people are willing to ignore the water regs to try to minimise an already low risk situation. ...