The loan itself

What is a first-position HELOC?

Lien position, briefly

Lien position is the order in which lenders are repaid if a property is sold or foreclosed. The first-position lender is repaid first.

Almost every home equity line of credit in the United States is written in second position, behind an existing mortgage. It is an additional loan against leftover equity.

A first-position line is different in kind. There is no mortgage behind it because it replaced the mortgage.

Why that changes what the product can do

A second-lien line is limited to the equity remaining after the mortgage. A first-lien line can be sized against the property itself, subject to the lender's combined loan-to-value limits.

That size is what makes the everyday-account approach possible. A line that only covers a fraction of the debt cannot serve as the account your whole financial life runs through.

What stays the same

It is still a home equity line of credit. It is secured by your home. The rate is variable. The lender's rights to freeze or reduce the line under federal rules are the same rules that apply to any home equity line — lien position does not change them.

Anyone telling you a first-lien line is exempt from those rules is mistaken.