Water Takes a Long Time to Get Hot: How to Fix

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Water Heaters
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I had a tankless water heater installed two years ago and noticed that I am using one heck of a lot of water down the drain until the water gets hot. I am tired of paying for wasted water. Can someone help as to what to do? I've heard of a recycle pump, but the cost is extremely high. Any other suggestions to stop wasting water?