I put tankless gas heaters in every house I build , I use the brand norwitz.
I use the 11 series mostly. One time I turned on 25 hot fixtures ( sinks , tubs, showers, etc) ran them for an hour straight just to see what happened . Never lost heat under 120 degrees from any of the fixtures . So of the flow became slightly restricted once all 25 were on but like I said never lost temp . Try that with a tank heater ... Not happening . Also the heater is not on constantly heating a tank . In some areas you may need to install filters / water softener in order to not void a warranty , this is not the case in Baton Rouge but I'd check your area . The guidelines are posted online for each brand heater . I try to centralize the location of the heater so it does not take long for hot water to reach each fixture but its important to be close to the laundry room if you have a High Efficency washer and use the hot cycle while washing . These new washers don't fill up with water they give very short bursts of water so a long run from the heater to the laundry results in that 1st or second "burst" not being heated water it is water that was in the line between the washer and backside of the Heater .
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