PVI Industries PV 500-6 User Manual

DURAWATT

® 

ELECTRIC WATER HEATER 

 

 

 

 

 

™ 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. 
 
 

™ Bolted Head Attachment