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Old 02-08-2010, 11:20 AM   #1
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Do I need an expansion tank/setup


I will be on city water and will be using an electric hot water heater. I am in the process of installking a 50 gallon hot water heater and need to know if I will need an expansion tank, back flow preventor or anything else. If I do what would be the sequence of installation from the cold water line coming in.

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Old 02-08-2010, 01:11 PM   #2
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Do I need an expansion tank/setup


If you have a closed system and nowhere for thermal expansion to go than it is a good idea. But if don't have a pressure reducing valve, check valve or anything else that would cause a closed system and if you don't have very high water pressure you should not need one. As for the back flow preventer, rarely do you see them on the water main in residential applications. Maybe on a boiler feed line or irrigation system.

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Old 02-08-2010, 05:21 PM   #3
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Do I need an expansion tank/setup


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Originally Posted by almostdone View Post
As for the back flow preventer, rarely do you see them on the water main in residential applications. Maybe on a boiler feed line or irrigation system.
Check with your municipality. More and more areas are requiring or will require backflow prevention devices.

Do you have a water meter? If you do, you might have a backflow device already installed in the meter. Then you should have an expansion tank.

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Old 02-08-2010, 09:47 PM   #4
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Do I need an expansion tank/setup


The short answer is yes. By code, you need the tank.
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Old 02-09-2010, 09:16 AM   #5
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Do I need an expansion tank/setup


Maybe its the code in NH, I think La has their own state PLB. code as does Mass. and the code does not require a tank for water heaters in Mass. It would depend on the code in the particular state your in.
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Old 02-09-2010, 10:15 AM   #6
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Do I need an expansion tank/setup


If there is a check valve at the meter regardless of code or not, you should put one in. If you don't, your T&P relief will "leak"

As for the R/P device, the code in oregon, MINIMUM is atmospheric vacuum breaker. We see the landscapers put in double checks most of the time though. If it has a pump or some means of creating backpressure, however, then an R/P would be required.
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Old 02-11-2010, 08:25 AM   #7
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Do I need an expansion tank/setup


SEQUENCE

1. Main water line entrance.

2. Shutoff valve close to entrance.

3. meter (unless meter outside somewhere)

4. Back flow preventer with check valve.

5. Shut off valve.

6. Expansion tank.

7. Shutoff valve.

8. Continue line throughout house.
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Old 02-11-2010, 08:35 AM   #8
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Do I need an expansion tank/setup


Check with your local building department as to whether or not you need an expansion tank. We are required to install them here for any structure connected to a city water supply but not on structures supplied by wells.
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Old 02-11-2010, 08:41 AM   #9
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Check with your local building department as to whether or not you need an expansion tank. We are required to install them here for any structure connected to a city water supply but not on structures supplied by wells.

You stalking me?????????????????? Just kidding..
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Old 02-11-2010, 08:54 AM   #10
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Do I need an expansion tank/setup


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