An electric water will work but possibly triple your water heating bill
and require an electrician to run 220 to an empty circuit, you do have
one right, and a good main size.
A new 83% Ng steam boiler will save you 15% on heating and you can
find one with a internal WH coil.
Will they even offer re-hookup in 10 yrs?
Is Ng cheaper per Btu than oil in your area, It is in mine by 20-25%
Have you considered your boiler repairs and maintenance, If you don`t do
maintenance you loose efficency and forget 70% , you could be at 60% or
less now. You have alot of numbers to run on payback, instal, and costs
of ng, vs oil, vs electric. You may find Ng the best option after all.
most do. Don`t forget that boiler is almost 30