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5
SECTION I - GENERAL DESCRIPTION AND CONSTRUCTION
GENERAL DESCRIPTION
This book describes a packaged electric water heater, approved by ABS Americas (A Division of the
American Bureau of Shipping) and the USCG (United States Coast Guard), which is a stationary, self
contained unit and is designed and constructed specifically for marine applications on board a surface
vessel. The complete assembly consists of the storage tank, immersion electric heating element(s),
thermostat, safety relief valve, safety high temperature cut out, and any other required electrical
operating control. Optional equipment may be supplied with your unit. Please consult the product
drawing for details specific to your assembly. The unit is factory assembled, insulated, jacketed, wired,
tested, and ready for electrical and plumbing service connections.
CONSTRUCTION
TANK
Standard Tank Construction:
The standard storage tank is constructed of steel and internally lined with specially formulated
Hydrastone cement to a ½-inch minimum thickness. The tank is designed for a maximum allowable
working pressure of 100 psi (150 psi TP).
Optional Tank Construction:
Optionally, the storage tank may be constructed of all welded solid copper-silicon alloy (ASTM B-96)
or type 316L stainless steel for maximum tank longevity. No internal lining is required due to the non-
ferrous materials used in the construction of the pressure vessel. The tank is designed for a maximum
allowable working pressure of 100 psi (150psi TP).
TANK CONNECTIONS
The heater is supplied with separate cold water and hot water connections. Water entering the cold
water inlet is deflected by means of a baffle within the tank. The hot water outlet includes a built in heat
trap to prevent hot water from radiating out from the heater. A ¾-inch FNPT connection is located on
the side of the heater for mounting a combination safety temperature and pressure relief valve. An
overflow line should be utilized from the relief valve outlet to a floor drain. A ¾-inch GHT connection
is supplied for draining. See drawing for locations and sizes.
HEATING ELEMENT
The water heater is supplied with an electric immersion heating element assembly(s), composed of a
copper sheathed element(s) that are brazed into a brass flange. Each assembly is fastened to a
corresponding tank flange using a gasket and four (4) 3/8-16 x 1-inch long hex head steel bolts and
nuts. See drawing for voltage and power ratings.