On a similar subject, turning on my bathroom faucet is noiseless, but
after a few seconds, there is banging/shuddering. Increasing the force
of water shuts it off. Only in bathroom sink. Rarely use 'hot' water
faucet, so this is just the cold one. No noise with shower, toilet, or
other household plumbing. I vaguely recall this has something to do
with "air in the pipes." Is there any simple way to purge them? I
mean, it's no big deal, but annoying.