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I have had 6,10 and 12 gallon and tankless water heaters. The incoming water temp makes a huge difference in the length of shower you can take and the recovery time and is the biggest determiner in water heater performance. When you turn on the hot water it will always take 4 or 5 seconds for hot water to arrive at the shower. When you have a tankless it will take about 2 seconds more. You will never notice the difference. But the difference the tankless makes is amazing. You really can take as long as you want to shower. If you are not on a sewer hookup you will have to watch that you don’t fill your grey while enjoying the shower. We use the 12 gallon and are happy. By the time I can get control of the bathroom the water heater is recovered. And since it is just the two of us I don’t think I will switch to a tankless but who knows maybe one day…
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