Bobby, I would say you have a direct-fired MLT, not RIMS. By convention, RIMS usually refers to pumping the wort out of the MLT, over a heating element, and back to the mash. RIMS is typically seen as different from direct-fire and HERMS.
Originally Posted by Bobby_M
I can see the confusion though because a typical 3-tier does NOT include a pump which is required for RIMS/HERMS. Once you get a pump to do RIMS/HERMS, it quickly becomes obvious that you can cut your stand down at least one tier.
This is the exact reason I decided to move to a single-tier stand. I had the pump for recirculating the mash on my 3-tier and realized I didn't really need gravity anymore.
There are some really nice multi-tiered stands that use RIMS/HERMS though. MonsterMash's system is a great DIY example of 3-tier + HERMS, the morebeer.com sculptures can have digital automation through a HERMS coil, and the Brew Magic is a 2-tier that automates the use of an external RIMS heating element.