Hi all, I need some help on how to turn off the hot water supply to my hot water taps. I need to change the tap and it doesn't have an isolation valve on the tap i want to change. The boiler tank i have is a heatrae sadia megaflo cl250. How would i just turn off the supply to the hot water tap to change and then switch back on with no airlocks/issues etc? Thanks Rob
If you just want to isolate just the hot water, there should be a gate valve above the MegaFlo. Something like this:
If there is, for goodness sake leave it alone. The work of the devil, designed to fail closed and leave you in the poo. Stick to your mains stop tap.
If no isolating valve on mains supply pipe to Megaflop, just turn mains stopcock off, as Joe said. The unit will remain full of water, but pipe from unit to the tap will fill with air but will not airlock later.
I never use gate valves except to use on a heating system. Full flow lever valve on any supplies (or brass stopcock okay on cold pipes). Gate valves snap or seize inside or fill with debris.