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Old 05-27-2011, 09:56 AM
 
360 posts, read 497,228 times
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In my new home - I have a crawl space and it is too small to put in a 75 gallon water heater. So the builder is putting 2 - 50 gallon water heaters in tandem. I hate running out of water since my wife and I take showers right after each other in the morning before work. Will this setup be sufficient or are there issues?
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Old 05-27-2011, 10:08 AM
 
Location: The Triad (nc)
17,602 posts, read 23,805,174 times
Reputation: 14795
Quote:
Originally Posted by blakeas View Post

In my new home
a 75 gallon water heater.
2 - 50 gallon water heaters in tandem.

Will this setup be sufficient or are there issues?
75 gallons? 100 gallons? whoa!
How many people live in this home?
And here did you get these sizes as being appropriate?

a few suggestions to explore:
a low flow aerating shower head
a point of use booster heater
an on demand WH
a circulating pump
a combination of these
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Old 05-27-2011, 10:37 AM
 
Location: Central Fl
2,901 posts, read 6,715,210 times
Reputation: 2596
While I agree with Mr.Rational, if you do go with two tandem water heaters, make sure the plumber puts hot and cold shutoffs on both heaters as well as a shutoff between them....you would have 5 shut-offs.

If you do this, and down the road one leaks, etc, you can turn off the leaking one and shut off the two valves, close the one between them and run the one until the other gets replaced...so you never have no hot water. I did this in an apartment house years ago. It was nice knowing that there would never be an "emergency"......that the place could run with one for a few days until I could get over to replace one......

Frank
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Old 05-27-2011, 10:47 AM
 
Location: Las Flores, Orange County, CA
26,362 posts, read 55,867,493 times
Reputation: 16412
Quote:
Originally Posted by blakeas View Post
In my new home - I have a crawl space and it is too small to put in a 75 gallon water heater. So the builder is putting 2 - 50 gallon water heaters in tandem. I hate running out of water since my wife and I take showers right after each other in the morning before work. Will this setup be sufficient or are there issues?
Has the builder (his plumbing contractor) done this before? Where? Who? Can you contact those customers and ask them how they like it? That's what I would do.
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Old 05-27-2011, 11:26 AM
 
Location: WA
4,066 posts, read 13,366,092 times
Reputation: 2949
I have seen this before but with today's heaters with rapid recovery it is not the only option. I have a high efficiency 100K btu heater that has very rapid recovery. It is only 50gal but does a much better job than an older ~70gal commercial unit that was only 40K btu.
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Old 05-27-2011, 01:06 PM
 
Location: Grosse Ile Michigan and Sometimes Orange County CA
15,819 posts, read 32,425,087 times
Reputation: 11868
Tankless gas water heaters give you endless supplies of hot water. You can run hot water 24/7 if you want to and never run out. They are not cheap. You save a little bit on gas costs, but mostly, you are paying a premium to never run out of hot water.
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Old 05-27-2011, 02:12 PM
 
21,725 posts, read 37,184,337 times
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The standby losses from TWO fifty gallon heaters and the initial expense of them is almost certainly enough to a make a tankless water heater MUCH smarter.
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Old 05-27-2011, 03:04 PM
 
Location: Grosse Ile Michigan and Sometimes Orange County CA
15,819 posts, read 32,425,087 times
Reputation: 11868
A good sized Tankless costs about 1800 to 2400 before installation. Certain brands (Rennai and I hink Noritz) can only be installed by a certified installer. Takagi can be installed DIY. If you cna install it outside, you will save a lot on the cost of vent piping.
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Old 05-27-2011, 03:10 PM
 
Location: Somewhere in northern Alabama
11,753 posts, read 27,321,510 times
Reputation: 14561
This is a case where there could be a simpler answer - install one 50 gal and turn the heat up on it. I have always had issues with the 130 degree mandate. Install a tempering valve downstream of the tank for safety.
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Old 05-27-2011, 03:35 PM
 
Location: The Triad (nc)
17,602 posts, read 23,805,174 times
Reputation: 14795
Quote:
Originally Posted by harry chickpea View Post
This is a case where there could be a simpler answer...
if only the OP would come back and fill in the blanks
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