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Energy-Efficiency Enhancing Technologies: Plastic Tanks
water heater tanks consist of a metal outer jacket lined with
either glass or cement. Due to its lower heat conductivity
characteristics, plastic water heater tanks offer an opportunity
for reduced standby losses and energy savings. Plastic tanks
cannot be used with standard center-flue gas fired storage
water heaters because the plastic cannot withstand the high
temperatures produced by the flames. Plastic tanks are an
option for gas-fired indirect water heaters.
options exist for the construction of plastic water heater
tanks. One method uses a seamless, blow-molded polybutylene
inner tank with a filament-wound outer tank. The second option
is a steel tank with an internal plastic tank. This type consists
of a thin steel shell with its interior coated in plastic.
advantage for plastic tanks in electric water heater models
is an improved process for insulating the tank bottom.