On Sat, 7 Nov 2020 06:51:15 -0800 (PST), Tricky Dicky wrote:

On the inlet pipe for the boiler there should be stopcock or isolating
valve shutting that will stop any flow in the hot water part of the
system but still allow you to have cold water.

And it might be wise to turn the power off to the boiler so if it
sees any flow it doesn't try to fire up or fire up if the CH demands
heat. The latter might not matter, I'm not 100% up on how these
complex modern combi boilers work...

--
Cheers
Dave.