By AnnaMaria Andriotis 

As the Federal Reserve prepares to raise interest rates, banks are promoting home-equity lines of credit with a temporary fixed rate.

The feature can be useful for borrowers who value predictability and plan to pay back the money before the fixed-rate period ends. But just as with traditional versions of the product that carry variable rates throughout, borrowers still could see their monthly costs eventually increase.

Home-equity lines of credit, known as Helocs, let borrowers use their homes as collateral to get cash that they can spend on repairs or renovations or on unrelated expenses, such as college tuition and vacations. Borrowers incur interest charges only on the amount they withdraw.

On typical Helocs, the rates can fluctuate as often as monthly. Now, more lenders are offering Helocs with a fixed rate that often lasts from 12 months to many years. Generally, the longer the fixed-rate period, the higher the interest rate in that period.

SunTrust Banks, for example, started offering a Heloc in December that comes with an initial interest rate that is fixed at 2.99% until January 2017 for funds borrowers withdraw immediately. In September, Regions Financial introduced a 1.99% fixed interest rate for the first 12 months a borrower has a Heloc.

Nearly 9% of Helocs offered in January had a fixed introductory rate, up from 7% a year ago and 1% in January 2010, according to survey data from home-loan information website HSH.com.

The offers are aimed at getting homeowners to use their Helocs as soon as they get them, since the clock on the fixed-rate period usually starts ticking once the borrower signs up, says Guy Cecala, chief executive and publisher of Inside Mortgage Finance, a trade publication. Experts say banks hope to boost lending amid tepid demand for traditional mortgages.

Some lenders are even allowing borrowers to pick when the fixed-rate period begins. In February, EverBank Financial started allowing borrowers to shift to a fixed interest rate on an existing Heloc for up to 10 years.

Consumers are increasingly inquiring about Helocs with temporary fixed interest rates because they are concerned that interest rates could soon rise, according to Kelly Kockos, home-equity product manager at Wells Fargo.

Their concern is that, if rates do rise, they could face higher monthly payments just as a kitchen renovation or other costly project gets under way, she says.

But Helocs also carry many of the same risks as adjustable-rate mortgages, which tend to have a fixed interest rate for a limited period. Such mortgages were popular with home buyers before the financial crisis, and their widespread use contributed to the spike in foreclosures during the housing bust as borrowers were unable to keep up with monthly payments when interest rates rose.

In fact, interest rates on Helocs can spike even higher. Most adjustable-rate mortgages cap the increase in the interest rate at five or six percentage points over the life of the loan. By contrast, the interest rate on most Helocs can rise as high as 18%, far above the average rate of 5.13% as of January, according to HSH.com, though that would happen only if interest rates in general rose far above current levels.

That kind of increase could make it difficult for borrowers who aren't wealthy to keep up with payments, though the outstanding balances tend to be much smaller than on adjustable-rate mortgages. Falling behind on Heloc payments also could lead to foreclosure.

Moreover, many Helocs allow for interest-only payments during the first 10 years. For the remaining 20 years, principal and interest is due monthly. That can add to the shock of a rising interest rate.

To protect yourself against rising monthly payments, find out how much the interest rate on a Heloc could change after a fixed-rate period ends. The interest rate on Helocs from Wells Fargo, for example, can rise by a maximum of seven percentage points over the life of the line of credit.

In addition, note that most Heloc rates are pegged to the prime rate, which typically moves in tandem with short-term interest rates set by the Fed. So find out how far above prime your interest rate will be. Regions, for example, charges prime plus one to six percentage points on its Helocs.

Homeowners borrowing a smaller share of their home value and who have a higher credit score are more likely to end up with a smaller margin between the prime rate and the rate they pay.

If you are worried about spiking interest rates, consider taking out a home-equity loan, which typically carries a fixed rate for the life of the loan.

With home-equity loans, borrowers withdraw the entire amount they need in one lump sum and incur interest charges on that sum right away. Such loans can be a better choice for borrowers who know they will need only a set amount of cash right away.

The interest rate on home-equity loans, though, tends to be higher. The average rate on such a loan was 6.25% in January, compared with 5.13% on Helocs, according to HSH.com.

Write to AnnaMaria Andriotis at AnnaMaria.Andriotis@wsj.com

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