A little illustration I spotted on the instant hot water unit 
over the communal sink, out in the hallway of my ryokan in 
Kyoto. Similar to a unit I first saw in Germany (although 
that one was electric). This one was powered with natural 
gas -- the main burner ignited with a whoosh just after 
the hot water tap was opened, and then shut off automatically, 
with the water. (I don't know what message the picture's 
supposed to convey.)
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