We have a tankless system and have had zero complaints. Our system consists of a heat exchange coil for domestic hot water that runs through our boiler. The heating capacity of this system is virtually identical to most of the gas fired on demand systems. The fears that it cant keep up are unwarranted. How often in your home do you REALLY run the dishwasher, clothes washer, and have a couple of people taking showers while you try to wash your hands?
The best thing about tankless is that you never run out of hot water. You can take as many long showers as you like and there will always be hot water for the next person.
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