You did not indicate why you were considering tankless but if it is to have hot water quicker, I would suggest adding a pump to your existing system.
efficient neighbor is 666kwh
I'm 842 kwh
all are 1303 kwh
I called today for clarification and the bottom line is (imo) the letter is sent out to entice people to consider buying "improvements"
I was told that my (approx) 200 kwh diffgerence to 'my efficient neighbor' was the equivolent of a water heater
guy on the phone said his parents had a tankless and he had considered oner, etc ... said the parents were happy and etc.
So I went looking to see what I could see and I found few comments/recommendations.
So I posted to the smartest people on the planet ...
I have all squiggly bulbs, uber low voltage/wattage leds for photo sensative window candle lights (VERY nice night time effect), and the usual, fridge, a small chest freezer, elect. water heater ... and a 200w heat lamp in the chicken coop on 24/7 these days
My bill is about $90 a month which is acceptable.