Pressure in Boiler is steadily rising

Bullshit.

Did you do what I told you to do last time you asked this ?

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I closed the valve before the water feeder and the pressure still rose in the boiler at the same rate over time.

That's nice. Now answer my question.

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You said to do the following:

"Drain the boiler, leave the fill to the potable open, and see if your boiler fills up. Remember, water will only move from high presure to lower presure. Your potable is always ~ 60 PSI. "

So, in your example above would I leave the feeder to the boiler open and the potable to the coil open? If so, I believe the boiler will fill to 15 psi and then repeat the pattern I described above, gradually increasing boiler pressure over time.

No, close the feed to the boiler. Perhaps I should have made that more clear.

What you believe is irrelevant. Your boiler neither knows nor cares what you believe. It is, after all, a boiler, and thus not sentient, nor caring in general.

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So if I do as you say, drain the boiler to 0 psi, shut the feeder to it and leave the potable open to the indirect tank. How quickly would you expect to see my boiler start filling assuming the coil has a hole in it?

!!!

How big is the hole ? You tell me.

Give it 12 hours, 24 if weather permits.

And do not judge by boiler pressure now, look for the actual water level. Drain it DOWN, not 'to 0 psi', Then watch for 'rising water', not 'rising pressure'.

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So you're saying, turn off the boiler, drain it completely (boiler pressure will show zero psi), shut the valve to the feeder, leave the potable to the indirect open, and with the boiler off and cold see if the cold water rises in the boiler.

Yeh, that's pretty much what I said.

Paul is right “HOWEVER” he did not tell you that most of

Internal leaks on/in heat exchanger are subject to temperature

changes, what I am saying that your heater exchanger may leak

At 160 degrees but it will not when it cools down or it may have

Reveres effect, it all depend where the leak maybe, also your

Plumber is full of s*it leak can be size of faucet or it may

take year to see any changes again depend on temperature.

Be aware that metal does shrinks and expand with temperature

Changes

It wouldn't fit up there.

Needs more grease, then :-)