From Bankrate.com: http://www.bankrate.com/finance/h...ccount.asp
HELOC does not impact FICO in terms of utilization ratio:
"The utilization rate only applies to credit cards. HELOCs aren't considered revolving accounts by FICO, even if they look like them on a credit report, says Anthony Sprauve, spokesman for myFICO.com, the consumer education division of FICO."
However, HELOC payment does impact FICO in terms of payment record:
"Your payment history on a HELOC definitely plays a role in your FICO credit score, Sprauve says. The good news is that you are making payments; and that accounts for 35 percent of your credit score. The fact that you're making two payments per month doesn't help or hurt your credit score, as long as you're making the minimum payment on time every month. That goes for all loans."