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SPECIFICATION FOR DOMESTIC WATER HEATERS
Power Combustion, Low NOx Gas-Fired Water Heaters with Nickel-Plated Storage Tanks
Furnish and install TURBOPOWER® gas low NOx water heater(s) as manufactured by PVI Industries, LLC
of Fort Worth, Texas. Supply quantities and model numbers as indicated on the plumbing schedule.
Gas and Electrical Consumption
The water heater will operate at a minimum of 83% thermal efficiency when tested to ANSI Z21.10.3. The water
heater will comply with paragraph 7.2.4.4, the thermal efficiency, the standby loss, and all other requirements of
ASHRAE 90.1-1999.
Pressure Vessel and Heating Surfaces
The water heater will be constructed and stamped in accordance with Section IV, Part HLW of the ASME code.
The storage section of the water heater will be National Board Registered for a working pressure of ____ 125 psi
(standard) or ____ 150 psi and will be pressure tested at 1-1/2 times working pressure. The heating section of the water
heater will be National Board Registered for a working pressure of 150 psi and will be pressure tested at 1-1/2 times
working pressure.
The heat exchanger will be a firetube design with the combustion chamber and all heating surfaces completely
water-backed. The fireside of the combustion chamber will be of boiler-grade steel. The waterside of the combustion
chamber will be non-ferrous. The fire tubes will be solid copper. The heating surfaces will be removable by unbolting
from the pressure vessel, allowing 100% access to waterside surfaces. The tank will be accessible in the field through a
manway sized opening, allowing access to 100% of interior surfaces. All tank connection fittings will be nonferrous and
removable from the tank.
Tank Lining
The tank will be a plated with electroless nickel (EN). Plating will occur after the pressure vessel is completely
fabricated and all welding is completed. The EN plating will be a high-phosphorus (10%) and nonporous composition
suitable for submersion service (ASTM B733 standard may be used as a guideline). For additional protection against
galvanic corrosion, which may occur within the potable water system, the electroless nickel plating may have a high-
dielectric-strength polymer overcoat.
The lined tank will not require sacrificial anode rods and none will be used. Water heaters that use anode rods in a
vessel that contains non-ferrous heating surfaces will not be acceptable.
Burner and Venting
Combustion will be provided by a forced-draft power burner with a gas train meeting the following agency
requirement for the input specified:
___ UL (standard)
___ FM
___ IRI
___ Other ______________________
Burner and heating section will be certified to operate with NOx emissions not to exceed 30 ppm corrected to 3% O2
(at or above 400,000 Btu) and 55 ppm corrected to 3% O2 (below 400,000 Btu). Water heater will be a category I, non-
condensing appliance. It will be UL listed for use with non-pressurized, type B venting material.
(continued)
PV 6454 3/04
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