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Old 01-16-2007, 05:29 PM   #16
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I have 2 water heaters and have a question


Upgrade to a 50 gal heater.

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Old 01-17-2007, 08:23 PM   #17
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I have 2 water heaters and have a question


Another thought here, what if you installed a valve at each Hot outlet of each heater, that way you could completely shut one off (gas and water). The one heater may recover quick enough for your needs, and if one leaks you can isolate it and still have hot water. You may need another expansion tank too.
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Old 01-21-2008, 10:53 PM   #18
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Originally Posted by Fog80 View Post
my family was actually thinking of installing a second water heater in our home. I'm glad i saw this thread!

what would you recommend for a home with no gas, only electric? We currently have one 40 gallon water heater and its not enough. The water heater is not that old, and it works fine. Should we just replace it with a bigger one? or add another 40 inline?
Another water heater inline will probably suffice. The problem with electric storage-type water heaters is the recovery time is a few hours. But the standby losses, especially for newer units is very little as they're insulated to the hilt.

If you have the capacity in your panel to support another 25-30 amp heater, a second 40 gallon unit will double your ability to take tandem showers, laundry, etc. Your bill won't necessarily be any higher, but your hot water use habits can change for the better.

If your panel lacks the capacity to support an additional water heater, the 1st heater in the tandem can be connected to the 2nd (original) heater by replacing the lower thermostat in the original water heater with an upper thermostat type, and wiring the new heater to come on when the 2nd heater is satisifed.

Of course, another (simpler) option is to just get a new 80 gallon heater.
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Old 01-22-2008, 06:31 AM   #19
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I have 2 water heaters and have a question


We respond to threads on their one year anniversary now?
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Old 01-22-2008, 07:05 AM   #20
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i wonder if he got it done??
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Old 01-22-2008, 07:45 AM   #21
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I have 2 water heaters and have a question


You know what happens is people do a search on google and it brings up the thread that is who knows how old and suddenly there is a new thread tied onto an old one.
Having said that, I will comment anyway.
To the latest thread of Fog80.... your questions have been answered, that is if you have room for a bigger tank (there are larger than 50 gallon) or the other option of adding electrical and another tank side by side and piping "in series".
To the original thread.... although it was done incorrectly in the pics the piping method used is "in parallel" and is very common in Texas and considered the preferred method although I see it done like in the pics all the time. The inlet and outlet pipes need to be centered to be balanced. My guess is the one on the right will fire more quickly and run out of hot water sooner. Only a guess. Teeing (bullhead) the cold any where on the horizontal would be better then what they did (but still wrong without centering) .But what struck me the most was 3 code violations.

1) On the venting (I need to check this one) both vents tied together, I don't think this would be allowed and certainly not without an increase in size where the 2 tie together.
2) T & P lines terminating at the floor (this was allowed when I was in Calif. 10 years ago, but not in Texas)
3) Is that a garage floor those water heaters are sitting on? (although they are sealed combustion and there is one city here that modified their code recently to allow that with the new water heaters)

I guess codes can be "uniform" or "international" but not necessarily applied in every state...may be a question for a new thread
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Old 01-22-2008, 02:56 PM   #22
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I have 2 water heaters and have a question


YOU are just fine the way you are, in a perfect world it helps to have them even,

NEVER NEVER install double water heaters in line,
per "ALL' water heater MFG'S the proper way is the way you have them ! !
you have 80 gallons of hot water, plus 80,000 btu's
of heating both water heaters work the same,
as far as draw off if you pull 20 gals of hot water it takes the same amount of gas to reheat reather you have one wtr/htr or two the differnce is less
time to recover,
check on your water heater mfg, website or call their tech. support

MACPLUMB MASTERPLUMBER & PH.D WATER HEATEROLGY!
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Old 01-22-2008, 07:00 PM   #23
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Now we know who installed those water heaters in Utah

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