I'm in the process of replacing a 50+ year oil boiler with a new 3 pass boiler. The new boiler configuration will include a new indirect hot water tank (SuperStor 60) to provide hot water for the house.
When I bought the house recently, the previous owner had installed a relatively new electric hot water heater tank (can't be more than 3 yrs old) which is currently providing the hot water for the house.
I am thinking whether it makes sense (practically and economically) to keep the current electric hot water heater as a backup to the oil fired indirect tank that is being installed.
I've been told it will cost about $400 to $500 to move, repipe, and rewire the current electric tank to sit parallel to the new indirect hot water tank. The electric hot water tank would sit empty and would only be filled and used for emergencies if the oil fired indirect tank or the boiler goes does and cannot produce hot water.
Does it make sense to consider this or should I just junk the current electric hot water tank and forget about using it as a emergency backup.
Any input and advice would be greatly appreciated.