We had a tankless system for our house in GA. The home was 4 baths, and a jacuzzi tub. I followed the maintenance procedure of de-liming the unit once a year. Used CLR. There were no problems and never had any problem hot water volume. I believe all the tankless systems have similar design features when it comes to providing hot water. That is: as the demand for hot water (volume) increases the system will provide full volume up to the point where so much water is flowing that it can not heat it to the desired temp. When that happens the unit begins to restrict the flow to maintain the outlet temp that it is set at.
The units I've seen in the new part of the Villages are on the small side and probably will begin to restrict flow if more than 2 spigots are opened. My recommendations - insulate as much as you can hot water pipes and regularly de-lime the unit (unless you have a water softener). Do NOT install a recirculating pump as that will void the warranty. It will also cause the tankless unit to run all the time which will significantly shorten the life of the system. There is a circulation pump (on Amazon) that can be installed at the furthest point to recirculate the water until warm water reaches it which will cause it to turn off. This will save wasting water but won't improve the time it takes to get hot water.
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