this is the same vacuum bag but now the heater is on the outside of the gel instead of the inside of the bag, this should give more even heating , we shall see! This is still a two 30 watt heater configuration. I did a 22 minute video for this one I will link. It did take longer to warm up at about 20 minutes , but the heat was more even. The gel was pre warmed up so it is not a fair comparison to test one so I will need to run this one again. The next setup I think I will run two heaters on each side in parallel so they get 15 watts each and spread out the warming effect.