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the pipe master
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Actually, depending on the tank design, they can stay hot for up to a week. The trouble is when you want to draw large volumes of water during a blackout.

Beware though that if you run gas and have a conventinal flu then you have no issues with power cuts and no hot water. as soon as you start adding powered fans to a heating systems then you have more to go wrong and no heat on power cuts. Most HW cylinders can keep warm for 4-5hrs so short powercuts are no issue. If you can keep it simple as possible.
 
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