Question: A water-heater is covered up with insulation boards over a total surface area of 3 m2. The inside board surface is at 75C and the

A water-heater is covered up with insulation boards over a total surface area of 3 m2. The inside board surface is at 75°C and the outside surface is at 20°C and the board material has a conductivity of 0.08 W/m K. How thick a board should it be to limit the heat transfer loss to 200 W?

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