Conserving water

Calculate how many euros are spent annually on unnecessary domestic hot water, which cools during the night in pipeline. Residential house has 129 m of hot water pipelines 5/8" and the hot water has a price of 7 Eur/m3.

Correct result:

p =  65.2 Eur

Solution:

p=365π(2.545/82100)21297=65.2 Eur



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