It's the way to switch your home loan to HELCO quickly

No lender will lend you 80% to 100% HELOC at the the very beginning when you buy a house. You want to switch it to HELOC as soon as possible to use it as checking account. The risk is that the interest rate of HELOC could change to higher or much higher compared with the 30 year fixed rate when you borrow unless your lender allow you to lock the HELOC rate when you start to use it. And when rate goes down, you can always refinance your HELOC to a lower rate.