On Mar 22, 12:10*pm, jamesgangnc wrote:
On Mar 22, 11:44*am, Aaron FIsher wrote:





On Tue, 22 Mar 2011 05:03:42 -0700, jamesgangnc wrote:
What you have is installed correctly. *Any poster that says otherwise
doesn't know what they are talking about. *What is your issue with it?
Are you just trying to understand it?

Hi James,
Yes, I'm simply trying to understand WHY they did what they did and WHAT
I should do with the temperature settings (which is the only thing I
'can' change).

I 'think' now that they simply added a second heater when they added the
two bathrooms and the nanny suite (which is far away from the hot water
heaters).

I 'think' I should set the first heater (i.e., 'water heater' as someone
deftly said) to half the work load of the second heater (i.e., 'hot water
heater' as was deftly said).

Since I read the thread about 140 degrees being optimal, I think I'll set
the second (hot water heater) to 140 degrees. Now I need to figure out
what the first heater should be set to for half the work.

If the incoming water is, say, 50 degrees, I guess I take 140-50=90
degrees and half of 90 degrees is 45 degrees.

Does it therefore make sense that I'm halving the load by setting:
- The (first) 'water heater' to 95 degrees
- The (second) 'hot water heater' to 140 degrees

I take it you do not have enough people in the house to be concerned
about running out of hot water? *If not you may want to consider
simply turning the first one off. *Otherwise your 90 deg setting is
fine.- Hide quoted text -

- Show quoted text -

If you want the absolute max amount of hot water possible, then set
them both
to the same temp, which is whatever temp you want the water
to be coming out of your faucet, eg1 30. If you want slightly less
max hot
water, but some energy savings, then the water heater the cold water
enters could be set
at the lowest temp. The idea here is that with a lower temp in
the first tank, that water will still be hot enough so that after it
enters the second tank, the burner in that tank will have enough
output to heat it up to the desired temp, eg 130, while water is
being drawn. I would suspect the second arrangement offers
slightly less max hot water volume, but some energy savings, as
the one tank will be holding water at a somewhat lower temp.