I've read several different opinions on capping off the tankless coil. I don't want to run in series with the tankless on my smith series 8 boiler. Just bypass it with an electric water heater.
We have extremely low electric rates

There is a 4007a Aquastat that the thermostat splices into then runs to a carlin 40200-02. I really don't understand about the aquastat the manual says it is low limit. But there is no high limit that I can see but I have 2 more boilers (3 family house) that uses the same setup. Do I set the temp at 140 or 190?

I do know most of the workings of the boiler just not the aquastat. Plus information on capping the coil. Not removing it. Thank you very much