Put them side by side
A score is a summary. This is the whole spec sheet.
Pick the systems you are torn between. We line up their numbers so you can see where one wins and where it does not.
Pick up to four. You can swap one out at any time.
Pick a system to start. Try one from our top picks if you are not sure where to begin.
Here is how to read this table
The overall score is the average of four checks: capacity, flow rate, warranty, and cost each year. Each counts the same.
A high score is not always your answer. If your water is hard and your house is full, capacity matters more to you than the average. Read the row that matches your problem.
Not sure which row matters? Check your ZIP code and we will tell you which number to weigh most.
Check the water in your ZIP codeCheck Price links may pay us a cut when you buy. Your price stays the same, and no maker can pay for a better score.
Every figure in this table comes from the maker's own spec sheet, warranty page or product page. Where a number is not published, the cell stays empty.