I have an old oil burning furnace that heats the hot water. The water does not have any tank it goes to when heated. I guess the pipes are heated. Anyway, I want to get an electric hot water heater and was wondering how to disconnect the hot water heating from the furnace.
I am hoping to eventually convert my heat to electric as well.
No you don't have a furnace. You have a boiler. The boiler heats water inside it's core. If this boiler provides heat and how water, then you have 2 cores inside the boiler in a standard, typical oil-burner boiler arrangement.
If you want to convert to electric water heating, the potable water input to the domestic coil, and output from, is removed and re-piped to a water heater. If you want to convert to electric heat that is an entirely different animal.
Wherever you live, I hope electricity rates are lower than .04 per Kwh because if it's not, heating with oil is cheaper.