Health Savings Accounts are a good way to set money aside and are typically offered to those with a high-deductible health insurance policy. The contributions made are deductible just like payments made into a 401(k) however withdrawals are tax free. According to HSACenter.com some other great benefits include using the account to meet your deductible; you are able to compound money over time, the money belongs to you, not your employer, so you are able to take it with you when you leave; and there is flexibility with the account.
The best way to utilize the account is to cover what you can with money outside of the account since the money accumulates. If you choose this option through your employer you can opt to have payments made automatically. Though, you can also choose a policy outside of your employment.
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HSAs: Your Secret 401(k) Power Booster