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MASSIVE hot water tanks! I worked at a hotel with only 66 rooms once, and we had 3 10,000 gallon boilers/tanks. Something that helps as well is that faucets don’t get as hot as typical residential faucets, which reduces hot water usage. I can’t remember because it’s been a while, but faucets are set to only get to say 100*F, and when the boiler keeps water around 130*F that means that you’re using a lot less of the hot water in the mix, reducing usage. Hard for guests to take long hot showers when the water isn’t so hot.
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