Re: [SilverStreak] Water heater options

["waymark1@xxxxxxxx" <waymark1@xxxxxxxx>]

Atwoods have an aluminum alloy tank "lined" with a zinc aluminum 
alloy that acts as the sacrificial anode to prevent corrosion of the 
tank. Suburbans are porcelain lined steel much like a home water 
heater tank. They have a separate screw-in anode rod.

A demand pump system does not pressurize the fresh water tank. It 
pressurizes only the plumbing "downstream" of the pump. Usually there 
is an accumulator (a miniature pressurized reservoir) to reduce pump 
cycling. It will draw a vacuum in the tank, so the tank has to be 
vented (or else the tank would collapse). The vent should have a 
filter to keep dirt and bugs out.
Al G.