Anti-corrosion Methods  http://www.pvi.com/anticorrosion.html

Gas Water Heaters

Condensing  
TURBOPOWER 99 is a fire tube, condensing storage water heater featuring dual submerged heat exchangers
PLATINUM is a small footprint, fire tube, condensing storage water heater featuring a submerged heat exchanger. 
Power VT is a vertical fire tube, condensing gas water heater featuring trouble free operation in a durable vessel design.

Non-Condensing
TURBOPOWER is a fire tube, semi-instantaneous or storage water heater featuring a two-pass, submerged
heat exchanger that bolts to the tank and is completely removeable; providing unequalled field accessibility and maintainability of both the exchanger and the tank.
MAXIM IFB is a low NOx, vertical fire tube storage water heater combining medium to high recovery capacity and storage in a small footprint.
MAXIM is a vertical, steel fire tube storage water heater with a power combustion burner. It combines medium to high recovery capacity and storage in a small footprint.
AG Series is a vertical fire tube storage water heater combining medium to high recovery capacity and storage in a small footprint.

Low NOx
Power VT is a vertical fire tube, condensing gas water heater featuring trouble free operation in a durable vessel design.Heater is SCAQMD certified for low NOx operation.
TURBOPOWER is a fire tube, semi-instantaneous or storage water heater featuring a two-pass, submerged heat exchanger that bolts to the tank and is completely removeable; providing unequalled field accessibility and maintainability of both the exchanger and the tank. Heaters up to 399 MBH use a low NOx end shot burner. Heaters from 800 to 1200 MBH use a pre-mix, metal matrix surface burner with proportional gas/air control.
MAXIM

Natural and LP combined
MAXIM IFB GAS is a low NOx, vertical fire tube storage water heater combining medium to high recovery capacity and storage in a small footprint.

Electric Water Heaters

DURAWATT is a heavy-duty, medium to very-large capacity electric water heater.
DURAWATT CL are light-duty commercial water heaters available in smaller storage capacities and kW inputs with non-ASME code tank construction.. Heating elements are copper-clad and flanged.

Oil and Combination Oil & Gas Combination

TURBOPOWER is a fire tube, semi-instantaneous or storage water heater featuring a two-pass, submerged
heat exchanger that bolts to the tank and is completely removeable; providing unequalled field accessibility and maintainability of both the exchanger and the tank.
MAXIM is a vertical, steel fire tube storage water heater with a power combustion burner. It combines medium to high recovery capacity and storage in a small footprint.

Multiple Energies

FlexFuel Dual Water Heaters combine two energy sources in a single tank. You can combine gas, oil, electricity, steam, boiler water, solar or waste heat from condensers, heat pump loops, condensate, etc. Heaters are agency listed as dual energy heaters. Energy sources can operate independently (one at time by manual switch over) or simultaneously depending upon application.

Storage Tanks

SUPERTANK