Home equity or refinance

[Rod Borges]

I recently a acquired an triple decker in MA. There's some updates which I'm currently taking care of and it's fully rented. I've been readind a lot about real estate investing, tips, advices, landlording, etc. 

There's one thing that I would like to know about options to buy another property. 

I've heard an episode with Eric Bowlin about the brrrr strategy which was very good. So, when it comes to acquire a new investment property, should I use funds from a home equity or refinance? How long after you buy a home can you refinance?

Thank you for your thoughts.