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DURAWATT
®
ELECTRIC WATER HEATER
PV500-6 09/07 13
SUPERTANK™ BOLTED HEAD REMOVAL
SUPERTANK™ water heaters and storage tanks will have one or more removable heads or bolted tank sections. The
heads are used to mount an energy module (i.e. TURBOPOWER
®
module, electric elements, QUICKDRAW
®
or steam or
water heat exchanger heating elements) or bolted head for access to the tank. If a head or module is removed during the
course of maintenance, replace the O-ring and all special
high quality 9/16”-12 NC, grade 8 bolts, washers and nuts with
identical parts available from your PVI representative or directly from PVI. Do not reuse or substitute these special
fasteners with similar grade 8 bolts, washers and nuts. Install the flange bolts and nuts with a flat washer under each bolt
head and nut. First, snug them in an alternating star pattern. Then, using a calibrated torque wrench, and in an alternating
star pattern, tighten the bolts in 2 increments: 95 ft lbs and 145 ft lbs. Use a small amount of silicone RTV to hold the o-
ring in place while positioning the flanged head or heat exchanger. Apply adhesive sparingly!
Contact PVI at 1-800-433-5654 for replacement Fastener Kits and O-Ring Replacement Instructions.
IMPORTANT: Mark one hole on head and on tank flange for reference when removing head. Be certain to align these
holes during reassembly to insure the original gasket or O-ring mating surfaces will be correctly positioned.
Typical Vertical SUPERTANK™ Bolted Head Attachment
FIGURE 13