The mattress warranty is an important consideration, even though most owners never have to use it. Most mattress warranties span 10 years or longer, and some surpass 20 years in length.
However, the length of nonprorated coverage is more important than the overall length. During nonprorated coverage, mattress owners pay little (if anything) to have their bed repaired or replaced when defects occur.
When prorated coverage kicks in, they must pay a percentage of the original price for repairs and replacements, and this percentage often increases with each passing year — resulting in hundreds of dollars in extra costs for some. Some mattress warranties last 10 or more years, but only provide one to two years of nonprorated coverage.