Replacing hot water heater in Denver, I need help

[Adam Bourg]

My hot water heater has a leak, I had a plumber look at it and they couldn’t find the issue. It’s 14 years old and they quoted me $3000 to replace it.  This is Apple wood plumbing, I live in Thornton Co. It has a 10 year warranty but the cost is a bit higher then expected. I was reading Brandon T. Book on rental properties and he said that water heaters are typically $600 to replace. Not sure how that is possible but I’m reaching out here. What is the average price in the area and does anyone have a recommendation on a good plumber or service to replace the water heater? Is $3000 a fair price?