I need a new water heater and I'm considering a tankless (on-demand) due to the long term cost/energy savings and space savings. A local plumber has recommended against it due to the water in town. I think he said the water has chloramine which causes problems with the tankless system. It's also hard water, but I think I can address that with an annual flush with vinegar. Does that sound right? Is there anything that can be done about chloramine? Thanks.