indirect water heater vs. electric water heater.

Hi. My 7-year old 40gal SuperstorUltra indirect water heater sprang a leak and I need to replace it. My well=maintained boiler is an oil-fired 7year old Burnham MPO-147, originally advertised at 85% efficiency.
How do I figure out if better to replace the indirect water heater in-kind, or switch to all electric?
Assume 2 adults and 2 children in the house. 220V is readily available. Propane, natural gas, and heat-pump waterheater are not being considered due to availability and reluctance to try new tech.
I'm not afraid of the math to compare. I just need guidance on what to do. Many thanks! Theodore.
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On 11/9/2014 9:10 PM, snipped-for-privacy@yahoo.com wrote:

You can compare fuel cost here. http://www.cozycabin.net/index.asp?r=0&pid &calc=yes Propane and natural gas is far fron new trchnology after 75 or more years.
Easiest is usually to replace with what you have.
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