Replace Expansion Tank, Buderus LP boiler

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  #1  
Old 05-03-19, 10:35 AM
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Replace Expansion Tank, Buderus LP boiler

Hi there,
After having 2 different plumbers cancel on me this week, I'm feeling like this expansion tank situation is easy enough that I can do it myself. I've read up many other threads about how to handle it and it seems pretty straight forward. My system has a valve at the water entrance, then another after the tank, before it heads into the buderus pressure management system located under the boiler. It's very simple to isolate, so I can't imagine i'll have much trouble.

I assume something like..
1. Isolate.
2. drill tank to drain (since it's full)
3. remove tank.
4. teflon tape on threads of new tank, screw new tank on
5. open water entrance side valve first.
6. open valve after tank to boiler.
7. go relax

Is there anything special I should know about doing this on a high efficiency LP boiler, other than to shut if off first and drain the relief valve?





Thanks in advance.
-Randy
 

Last edited by thelumpya2; 05-03-19 at 10:50 AM.
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  #2  
Old 05-03-19, 12:58 PM
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t,
In your case because of your valve placement it is that easy. Obviously shut your boiler down and if there's time let it cool. When full that tank will weigh about 35 lbs. so be careful but if it can fall to the floor free of doing damage then you may not have to drain it. Up to you.

They can be a little difficult to unwind, depending how tight they were put on. You do not need them as tight as you can get them. Tighten a little and check for leaks. You can always tighten a little more if needed and wind tape colockwise so it doesn't come off when tightening.

Doesn't matter what type of system it's on. Serves the same purpose.

Hope this helps a little.
 
  #3  
Old 05-03-19, 04:59 PM
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Thanks!

Fantastic, I think your posts were the other information ones Id read. I appreciate it!

Cheers,
-Randy
 
  #4  
Old 05-07-19, 07:25 AM
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So initially after replacing the expansion tank, I still had a leaky Pressure relief valve. Since then, I've flushed the sediment out of it a few times, and it seems to have re-seated the valve. It's been 24 hours now without a drop. Fingers crossed.
 
  #5  
Old 05-07-19, 10:12 AM
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Thanks for the update. Sediment can be a problem and the insides of the relief valve can corrode. Sometimes can be flushed or replaced but at least your pressure problem is solved.
 
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Old 05-07-19, 11:03 AM
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I hadn't seen any previous mention of a pressure relief issue.
Make sure the pressure on the gauge stays in the safe operating area.
 
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