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OK no problem!That’s fine and I’m not criticising I just wouldn’t risk it in a paying customers home
If it’s a kitchen sink tap and it’s a mixer. Simple fix. Open the hot tap put your hand over the outlet, then open the cold tap. This should force the mains water back into the hwc and blow the airlock back into the hwc. Then (the messy bit) shut the hot tap then the cold.Hot tap or cold it's a mixer tap
Reply to the thread, titled "REGULAR BOILER HELP (HEADER TANK IN LOFT)" which is posted in Boiler Advice Forum on Plumbers Forums.
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