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"Matt"

Disagree Steve......

As another poster said, hot water does not need to be heated. Hooking 2
heaters in series will not double capacity, it will however double your
fuel bill and cut the life of both water heaters in half.

Bull. Hooking 2 WH's in series WILL double capacity.

The fuel bill will increase some, but there's a demand for more heated water.
Do you know of another way to increase the amount of water heated without
increasing the fuel bill at all?

No disrespect intended, but it just doesn't work that way.

Matt

It works fine that way.

I read the article, and although they do say that a series
configuration will work (which is news to me, I admit), virtually all
of the rest of the article says use parallel.
There are pro's and cons to each method.

The only benefits listed
to using a serial configuration were cheaper to install and less piping
to run.

Sounds pretty beneficial. I would install bypasses and the proper valving so as
to allow an either/or use when either needs to be taken out of service for
replacement.

"Although series piping can shave costs and work quite well under many
circumstances, the first tank once again sees the lion's share of the
workload and will no doubt fail long before the second tank.

What's wrong with that? With one heater only, it see's the "lion's share"
anyway.

If a
bypass piping arrangement is not in place when that happens,
interruption of service is assured until the first tank is replaced. "

Gawsh life sucks.

I still maintain the way to go is parallel in all circumstances.

Assuring both heaters will fail simultaniously.