Proving My Coil Is Thick Enough Part 2/2 - Video

Relying on the passive heating system didn't work; it took almost 5 hours to heat up. The furnace was too small. My dad recommends that the copper coil be thicker, but I'm too cheap to try that just yet. This is how I heated the water up in a reasonable time. Make sure to check out the long-form video of what I would change to make the system better.