Special fittings

[Taylortractornut]

I have a question for yall folks. I dont know the name of the fittings Im looking for or the the Source. Im working on a way to heat domestic water and provide a remote room with the excess hotwater. What I got planned is making a copper coil to go inside the wood heater, like a commercial unit I saw. I got all the stuff to do this, except I dont know what kind of fittings to let my coil inlet and exit pass through the heater wall.
What I plan on doing is making a copper coil that water is run through and into a hotwater heater tank. After that its circulated through the PEX tubing into a smal lcar transmission cooler or other heat exchanger. I saw another home built one that the heater had a set of 3/4 steel pipes welded to the outside of the heater about 8 inches long. The coil was placed into the heater and the lines run out through the pipes in the heater wall. Then the copper lines were braved into place. I want to make mine removable if it doesnt wor I can weld the holes up. Take care Taylor Lambert

 

[CurlyDave]

I think what you want are call "liquid feed through fittings".

Look at your local hydraulic supply house.

 

[Taylortractornut]

Thans Dave, I told my wife that I knew that someone here could tell me what I was looking for. I couldnt name it even though we use a similar fitting on truck air brake systems.

 

[mjncad]

Sounds like you need bulkhead fittings.

 

[kennyd]

Sounds like you need bulkhead fittings.

Exactly. DHH has steel NPT ones.

 

[Kays Supply]

Be sure and put some kind of relief valve on this thing. It could blow like dynamite if it gets too hot. A 40 gal water heater full of steam is equal to 7 sticks of dynamite.

 

[wedge40]

Now that I did see on Myth Busters. Pretty much went through two story house.

Wedge

 

[Taylortractornut]

I have a new presure relief already. Actually I have2 of them in the system. The college I use d to go to had an incident in a girls dorm once with a hot water heater. They had hired an imigrant worker to help with plumbing. He saw a leaking fitting and put a pipe plug in it and left it. He didnt know it was leaking for a reason. Later that night it cleaned out the laundry room thankfully no one was in there.