What is the amps on this heater? Do you need 30 or 50 amp 240 volt breaker?

This would use a 15 Amp 240 Volt Breaker. These are mainly used for heating very small areas, like apartment building hallways or a small bathroom. Will need something significantly larger for a garage. We recommend using our sizing calculator to make sure you're getting the correct system for your needs. Go about half way down the page until you hit the quick sizing area. Quick Sizing Guide

If you have any further questions, please call us and we will be happy to assist you.