u/vichpeg

hi. drain off valve to our unvented hot water tank is leaking.

pressure has dropped to about 0.4 bar.

is there anything I should be doing until I get a plumber out (I dont want to try tightening it myself and making a leak a waterfall).

keep heating/water off? should I be topping up the pressure? or just shut it all down? turn off valves?

thanks