The hot water tap in the kitchen at JeeLabs is provided by what’s called a “close-in boiler” in the Netherlands: a small 7L electrical boiler, sitting under the kitchen sink and hooked up with two reinforced flexible hoses, similar to the ones often used in showers.
The rubber in these hoses is probably high-grade, but their normal lifetime is rated at 10 years. At JeeLabs, they were 19 years old and decided to start spraying, as you can see in this close up:
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