are often composed of strong inexpensive but highly heat conductive metals to minimize cost high quality small cell and uniform foam insulation 26b is shown positioned between inside bracket 30 and water tank 24 and between inside bracket 30 and outer jacket 14 fig3 is a schematic depiction of a water heater 10 hung from a substantially vertical wall w wall bracket 22 and bumper 28 are vertically aligned and extend from outer jacket 14 so that water heater 10 remains in a substantially vertical position when hung water inlet 18 and water outlet 20 are positioned on the bottom portion of water heater 10 so that water heater 10 may be hung adjacent to a ceiling c or other overhead obstruction bumper 28 is optional fig4 and 5 show the different heat losses that occur through a bracket assembly when foam insulations having different densities and cell uniformities are used in both fig4 and 5 the bracket assembly of an installed hangable water heater is shown the water heater is hung from substantially vertical wall w by a bracket assembly consisting of wall bracket 22 and inside bracket 30 in fig4 foam insulation 26a having low density and a non uniform cell structure of the kind located at the top of an open top vertical pour is positioned between outer jacket 14 and water tank 24 in fig5 the foam insulation 26b possesses high density and uniform cell structure and is positioned between outer jacket 14 and water tank 24 in the vicinity of the bracket members 22 30 and the interconnecting bolts 31 the very different heat losses in the structures depicted in fig4 and 5 are shown schematically above the drawings and indicate that an advantageously smaller heat loss through the bracket assembly is suffered when.