In the older high rise I lived in in Fort Lauderdale, many of us retrofitted the hot water system to electric tankless systems (no gas in the building). Some of us had a unit installed in each of the bathrooms in our apartments. There was no problem with how instant the hot water was. It came out hot and long lasting (i.e. we never ran out of hot water). The only problem any of us experienced was the quality of the water flow into the building. Fort Lauderdale water carries a lot of sediment. After the initial installations burned out a few units, there was a simple solution...additional filters added for the unit for those of us switching to electric tankless systems with minimal maintenance required. By the way, the under sink unit was no bigger than a BBQ tank and flat. It did not interfere with storage or aesthetics. The only downside was the initial cost for replumbing the bathrooms to a modest extent.
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