What should I learn about my 1940s tankless coil oil boiler? (General Motors Delco DB-4S)

CoachBoilermaker

https://forum.heatinghelp.com/discussion/comment/1807640#Comment_1807640

Done.

HVACNUT

https://forum.heatinghelp.com/discussion/comment/1807221#Comment_1807221

I don't do big commercial work. Where I am, ninety-five percent of the houses are ducted air handlers that are either heat pumps (air to air, and geo), or with hydro coils, or both. Even the old houses, there's no evidence of what was original. It's a shame, but when you need to floor display your 9 cubic foot art piece of 87,641 straight pins all stuck to a magnet, it can't be outshined by a beautiful radiator.