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The sensor - that's the magical part I wanted to know about. Thanks AJB! Now googling flow sensors and how they work :)

How does a gas instant hot water system know when I turn on the hot water? What's the feedback loop from the tap to the water system? How does it know I want hot water, not cold water? I've googled a bunch of 'how does a gas hot water system work' type questions but all results seem to give...