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Old 10-25-2009, 09:34 AM   #1
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connecting copper to hot water heater


can i take a female threaded copper fitting and hook up directly to my hotwater heater and sweat after that or do I have to hook up a threaded brass coupling and go after that, i am hooking up a water to water heat exchanger on my water heater,from a outside wood boiler

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Old 10-25-2009, 09:55 AM   #2
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connecting copper to hot water heater


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can i take a female threaded copper fitting and hook up directly to my hotwater heater and sweat after that or do I have to hook up a threaded brass coupling and go after that, i am hooking up a water to water heat exchanger on my water heater,from a outside wood boiler
I used the flexible metal hoses that are available to hook mine up. It does away with unions.

Gary

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Old 10-25-2009, 10:09 AM   #3
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connecting copper to hot water heater


A dielectric union should always be used to separate the steel tank from the copper pipe.

Not using the dielectric union will shorten the life of your water heater by about 5 years.

When copper touches iron you are creating a 'battery'--the corrosion is amazing.


By the way-when sweating a threaded fitting ,sweat the pipe to the fitting ,allow it to cool-then screw it in. Sweating to a threaded fitting that is already screwed in often leak.The expansion and
contraction from the torch often breaks the seal on the dope or tape at the threads.
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Old 10-25-2009, 11:00 AM   #4
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connecting copper to hot water heater


this line is running from water heater (pressure relieve valve) to water heater(drain valve) ?? do i still need dielectic union??
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Old 10-25-2009, 11:08 AM   #5
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connecting copper to hot water heater


If the valve is brass-no dielectric is needed.copper to brass will be fine.

I can't picture exactly what you are doing, Sounds like a fun project.
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Old 10-25-2009, 12:26 PM   #6
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connecting copper to hot water heater


no valve,leaving water heater and going right back to it,from top to bottomn adding exchanger in middle of run
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Old 10-25-2009, 12:36 PM   #7
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connecting copper to hot water heater


Use a threaded galvanized nipple-then a dielectric-then your copper.-MIKE-
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Old 10-25-2009, 07:29 PM   #8
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You can also use an 3/4" insulated (dialectric) nipple.
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Old 10-26-2009, 07:47 AM   #9
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connecting copper to hot water heater


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Originally Posted by geobckmstr View Post
this line is running from water heater (pressure relieve valve) to water heater(drain valve) ?? do i still need dielectic union??
I hope I am reading this wrong or do not understand it.

You are not messing with the PT Relief valve on the Hot Water Heater are you?????????
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Old 10-26-2009, 08:31 AM   #10
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connecting copper to hot water heater


I have a picture of you coming out of the water heater drain, then going through your heat exchanger and back into the pressure relief valve port. That is a bad idea. Leave the T/P valve alone. Tee into the feed line going into the top of the water heater instead.
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Old 10-26-2009, 09:18 AM   #11
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connecting copper to hot water heater


I will be teeing in ay them points but will still have the pressure relieve valve at the end of tee
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Old 10-26-2009, 09:42 AM   #12
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connecting copper to hot water heater


IRC P2803.6 Installation of relief valve. A check or shutoff valve shall not be installed in the following locations:
1. Between a relief valve and the termination point of the relief valve discharge pipe.
2. Between a relief valve and a tank; or
3. Between a relief valve and heating appliances or equipment.

IRC P2803.6.1 Requirements of discharge pipe. The outlet of a pressure relief valve, temperature relief valve or combination thereof, shall not be directly connected to the drainage system. The discharge from the relief valve shall be piped full size separately to the floor, to the outside of the building or to an indirect waste receptor located inside the building. In areas subject to freezing the relief valve shall discharge through an air gap into an indirect waste receptor located within an heated space, or by other approved means. The discharge shall be installed in a manner that does not cause personal injury or property damage and that is readilly observable by the building occupants. The discharge from a relief valve shall not be trapped. The diameter of the discharge piping shall not be less than the diameter of the relief valve outlet. The dischagre pipe shall be installed so as to drain by gravity flow and shall terminate atmosherically not more than 6 inches (152 mm) above the floor. The outlet end of the discharge pipe shall be threaded and such discharge pipe shall not have a valve installed.

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