On Mar 14, 8:45*pm, wrote:
On Mon, 14 Mar 2011 18:49:47 -0400, "Stormin Mormon"

wrote:
Why would you want to heat hot water, it's already hot?

Parallel operation allows for higher GPM flow.

I fail to see how too in parallel are going to allow for a higher GPM.
The GPM is going to be largely determined by the incoming pipe
size and water pressure. After the water leaves the water heaters,
it flow through the same pipes, so again the flow rate is going to
be determined by those pipes, faucets, etc. Following that logic,
I could just cut out a small section of 1" pipe in a water system,
replace it with too parallel sections, and voila I'd have a higher
flow rate. This would only be true if the eqpt being paralleled
offered signficant flow restriction. Not the case with a water
heater.



Series operation allows you to balance which one does the
most heating. Not sure there's any advantage to that.

Either operation can be set up to bypass one heater during
replacement of the WH.

The teens shower off WH 1 makes good sense, to me.

* Even with series connection you can run kids shower off the first
one and dishwasher off the second, etc.

Not without replumbing the house he bought, which didn't seem to
be the objective.


The first one heats to a
preset safe temperature, and the second heats to a higher temperature,
using only as much power as is required to raise the temperature that
amount - and can deliver a whole lot of hot water without any
significant drop in temperature.