Plumbing question anyone ?

[PrepperJohn]

I would look under the sink to see if there is a way of isolating that hot tap The may be what looks like a straight connector that either has a ref plastic tap or a small screw head that would require a screw driver.

If you don't have either of these under the sink then there may be a way of shutting off the outlet from the hot tank.

If not you may have to drain down the hot tank and loose all that lovely hot water so have a bath.

If you don't have the isolators for each tap, fit them while the water is off so you don't have this problem again

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That should say RED plastic tap