Capping a boiler domestic hot water heat exchanger


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Old 05-10-06, 07:24 PM
M
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Capping a boiler domestic hot water heat exchanger

I have a 40 year old AP oil boiler that still burns clean and provides ample heat and pressure for the forced hot water heating system.
The domestic hot water heat exchanger in it, however, stopped producing above 110F on continuous demand from a tap.
I cannot afford to replace it yet, and I don't see the need to.
So I am installing zones and an indirect hot water heater.
However, is it OK to just cap off the heat exchanger in the boiler?

Thanks.
 
  #2  
Old 05-11-06, 04:57 PM
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Domestic Coil

Do not cap both sides unless it is done with push-on type caps. Do not use an soldered or screw-on caps. To do so can lead to a build-up of pressure. If you have no intention of using the coil again, just leave the stubs exposed or put a layer of tape over them just to keep out any critters.
 
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Old 05-13-06, 02:36 PM
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soldered

Thanks for your reply.

The plumber soldered it. However, he also says it was leaking. I did observe water coming from the coil when the boiler was up and running. So I hope that is actually a good thing, keeping the coil filled and minimizing the temperature differential and thus no pressure either.

MM
 
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Old 05-13-06, 02:40 PM
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Domestic coil

If the coil was leaking, the sealing of the coil was the right move.
 
 

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