Hi, The item you describe is a "pressure release valve" and it releases pressure in the hot water tank when reaching its set bar rate in your case "3bar" . This valve is required to prevent the tank / system erupting / bursting under extreme hot temperatures. If it is leaking then i would recommend contacting a local approved plumber to get a replacement and install. You can find an approved plumber in your local area by going to www.watersafe.org.uk. Hope this helps Regards Justin
so I wouldn't be able to do it myself then if I could get the part?
To be fair its not always easy as abc to change - sometimes you have to drain the tank etc and the installation seal has to be 100% first time when you put the new one in otherwise you could have a big water leak! - and when that starts you can just turn it off at a tap. It would br far more cost effective to hire a local approved plumber in the long run ;)
Ok thank you very much for your advice. I guess I'm gonna have to bite the bullet, pay a plumber and eat beans on toast for the rest of the month!
I understand.... get a few estimates and compare prices. But like i said its more cost effective in the long run that having a battle with a tank full of water and a major water leak in your hands. Regards Justin