Our gas tankless takes forever for HOT to get to shower. Which works for me I wash my hair in cold water, and rinse with warm. By that time the water is to temp.
I also only run the dishwasher after laundry or shower so water is always hot. No idea how many gallons but if I need to water the plants, a 5 gallon bucket will be full before hot comes in to play
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Do not worry about things you can not change 
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