Best Of
Re: Troubleshooting a mystery... leak/flow reported with no physical leak found. Expansion Tank/Indirect
My bet would be a toilet tank float valve. It won't be the main valve (likely), but either the level in the tank set just a tad too high, and overflowing through the overflow, or more likely the float valve not quite shutting off and discharging through the tube which goes to the overflow. You won't hear that, and you won't see it in the bowl, either.
If it's the bowl recharge line from the float valve, food colouring in the tank won't show you that.
Re: Troubleshooting a mystery... leak/flow reported with no physical leak found. Expansion Tank/Indirect
Try food coloring in your toilet tanks to make sure they aren't running? Sometimes its so minor you cant hear it.

Re: Cleaning/Descaling Indirect Water Heater-Or is it too rusty?
Hi, Look for flex connectors that look like this: You want them to have the plastic sleeve between tube and nut. That along with the rubber washer inside makes them real dielectrics. If you took an ohm meter you would find no continuity between nut and tube. This sort of flex along with nearly any other brass or stainless fittings will work. 😊
Yours, Larry
Re: Beckett furnace orange flakes
You have a Sales Oriented service provider now.
Time to find a Service Provider.

Re: Beckett furnace orange flakes
Doesn't leak? Runs fine? Been that way for a while? New provider? Pity the new provider is a salesman resorting to fear. I don't have much use for those folks.
Can you find a different provider?
Re: Cleaning/Descaling Indirect Water Heater-Or is it too rusty?
Hi @EdTheHeaterMan , Actually the shirt is the same chambray blue work shirt I have on now. I make 'em last a long time. 😏
About hooking up the tank, I vote for corrugated stainless flex lines with true dielectrics in the ends. This allows for simple hookup when you get a new tank, and doesn't work-harden like copper. I would re-tighten the nuts about six months after initial installation as the washers can shrink with heat.
Yours, Larry
Re: How can I find (and test) my steam system main vent?
@ethicalpaul , it's much easier to do it this way if you're not used to working with steam. There is no question when the steam has reached a certain point in the system when you start from cold.
Re: Getting my 1924 system going again
Registered Mechanical Engineer. That explains a lot…
that said, you plan of action has merit! in spite of you credentials. 🤪🤪🤪.
As far as using your DHW for the fill to the boiler, It can help in some cases, like for a steam boiler that is using steam for baking bread or other processes. You have a closed system so the amount of makeup water you are introducing is nominal. Cold feed water is just fine.
Re: Getting my 1924 system going again
Sounds like a good plan. I'd not test your thermostat ( fire the system) until you get your relief and burner issues fixed.
Order of operations should be water, gas, electric.
Don't forget to drain the compression tank.
Regarding the burner, I'm betting on scenario 1. Disassemble, clean, test.
Son and I are building a bike for Bonneville so we may be in touch. 😃
Keep us apprised, we'd love to follow your progress!