General description, Construction, Tank – Hubbell Electric Heater Company SLN User Manual
Page 5
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SECTION I -
GENERAL DESCRIPTION AND CONSTRUCTION
GENERAL DESCRIPTION
This book describes a packaged solar water heater that is a stationary, self-contained unit. The complete
assembly on a standard unit consists of the storage tank, immersion heating coil, and an ASME rated
combination temperature and pressure safety relief valve. The water heater heats domestic potable
water by transferring heat from the solar loop (typically ethylene glycol) to the domestic water via an
immersion heating coil inserted into the water heater tank. 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, and tested.
CONSTRUCTION
TANK
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 150 psi (300 psi 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 installed 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 COIL
The water heater is supplied with a high quality, factory installed, high efficiency, single walled,
copper finned heating coil designed for a maximum working pressure of 150 psi. The tubing is
installed in a heavy-duty fabricated steel head with threaded NPT connections. Each assembly is
fastened to a corresponding tank flange using a gasket and hex head steel bolts and nuts. Double
walled tubing may be supplied as an option.