Hoping NashuaTech is around to help. I read a post here: https://advice.thisoldhouse.com/showthread.php?55799-oil-furnace-little-to-no-hot-water
I am in north NJ and have a Weil McLain boiler-burner using oil in a very old 2-story Victorian house with steam radiators. The boiler is about 14 years old. The tankless coil is the original - surprise to many. I've had it cleaned twice when hot water was ran out too fast. I am a single person who uses hot water rarely, but can hear it kick on even when I spend a minute brushing my teeth with warm water. So I do use oil all summer to some degree. I bought this boiler when the coil in the original gigantic boiler (about a million years old) leaked and could not be replaced - I came home one day to boiling water spewing out all my radiators flooding the house with dirty water. I really don't want that again.
I was considering converting from oil to gas, but the cost is stopping me - overall $8k to $10K. Then the next thought was to simply stop using the coil and get a indirect water heater or just a standard electric water heater. What is stopping me is that the basement has no drain. My fear is the popping of any water tank and a possible flood in the basement without any outlet, or just the need to flush it every 2 or 3 years to change out the rods. People have said I really do not want to install a sump pump or free standing pump. I've heard of gadgets that can be installed to detect water leaks and will shut off the water to the water heater. Someone said if you get a new water heater when the warranty is up it should not pop - but the risk is not one I think I can take.
I've thought of just shutting off the boiler during warm weather May-September, estimate I'll save one fill of the oil tank per my buying history (about $900). Then turn it on only when a cool shower is not realistic and do laundry and run the dishwasher that day. My oil company says that would harm the boiler due to condensation build-up not being good for the cast iron boiler. But that does not really make sense given if I had a water tank the boiler would not run all summer any way.
I had the house insulated under the federal tax credit and a huge state rebate, and use a wood stove evenings/overnight in cold weather that saves me about a tank of oil - so I'm down to 3 tank fills.
What are your thoughts?