It only has 1 side and is easier to make.
Because the ASME likes the idea of pressure vessels being round as round is stronger
Standard meter will suffice, need to know pressure from meter to house. Size pipe appropriately for gas pressure coming into house X distance to water heater. Gas company or plumber should be able to help with this calculation.
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I like to install two tanks -- if one goes down you still have hot water -- when you connect two tanks -- i would run cold water to first tank into top of cold water inlet -- then come out of the hot and run it to the bottom of the next tank where your drain valve is -- just remove and install a tee and put the drain valve back in -- then come out of the top where the hot water outlet is and install a by-pass valve so if one tank leaks you can turn the bad tank off and still have hot water till you can install another tank -- i have done this many times this way -- works good if you have enough room for two 50 gal tanks
a round
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Because the ASME likes the idea of pressure vessels being round as round is stronger
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It is a water heater, not a hot water heater. There would be little point in using a hot water heater. I assume that is your point.
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It's called water heater. There isn't a reason to heat hot water
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