oil furnace
 

furnace is for heat and hot water, can i make my hot water heat by electric?

As in an electric water heater? Yes, they do exist.

With some minor plumbing changes, of course you can. Assuming you have enough electrical capacity.

40-50 gallon range is typical for a medium size family 230Vs is required check your circuit breaker panel for room

Your best bet is a electric water heater, you have to disconnect the piping in and out of your boiler to the new electric water heater, you can install a piping arrangement to do this and still keep your boiler piping in place in case the electric water heater breaks and with the turn of a couple valves you can have a backup. You might have to make an adjustment to the aqua stat control on your boiler.