Insulated Water Heater Cuts Costs (Jun, 1931)
Insulated Water Heater Cuts Costs
A NEW and highly efficient type of household hot water heater has recently been perfected which bids fair to revolutionize domestic water heating. The water tank of the heater, shown in the photo at the right, is placed within a sheet iron shell and the space between this shell and the copper tank is filled with many layers of cellular asbestos. Spaces at top and bottom are packed with mineral wool. This insulation so thoroughly seals in the heat that a tankful of water may be kept hot for a period of several days.
In a test a tankful of water was heated to a temperature of 150 degrees, and 48 hours later the temperature was 112 degrees.