Some of you know I just purchased a used 03 Heat. My question is I know it has lh/rh tanks, but is it set up to were both tanks burn equal gas. Or does it burn only the tank your using? ex. using LH/tank only uses LH/gas. If not, do you have to keep swithching back and forth so that the boat sits even and not lean?

You must switch back and forth to keep level.
This helps you a bit to keep the boat level. Try to keep more fuel in the starboard tank. This will offset some of the natural left lean common in right hand rotation V hulls.
Dave

Wantacat,
Dave is as always correct. All single engine deep vees tend to roll off the keel line opposite of propeller rotation, which is usually right hand, rolling the hull to port. That's why the driver's station is usually to starboard. The twin tanks come in really handy to correct this lateral list. It's also correctable with tabs, but that will scrub off some speed and none of us like that. You can also move the passengers and gear around some to help.
The only annoyance I find with this setup is gas fills on both sides of the boat. None of the gas stations I regularly use have a hose long enough to reach across my boat. I have to fill one tank, move the boat and fill the other side.
An advantage is all that storage in the cockpit floor/ski locker, where you would normally have a fuel tank.
Regards,
Steve

Yep, gotta switch tanks to keep the Heat level. Its no big deal, once you get use to it. I agree w/ the annoying practice of fueling one side then having to move to fill the other. Sometimes, I would just go to a diferent station because when attempting to get to a nother pump, someone would drive up and take it!! Now I just go to a Flying J Truck Stop. They have pumps that you drive between. You pull up, put one nozzle in one side and one nozzle in the other side. I usually fill until I can hear the fuel coming up the to the breather, then stop before the pump shuts off. Other wise when you stop during towing , fuell will spill out both sides. Then you will have people screaming at you because you have spilled fuel out all over the road!

Just double checking but when you look at the fuel tank selector it shows tanks 1 and 2. I would assume tank 1 is starboard and tank 2 is port?? I guess I just want to confirm this.

Don't assume anything on a boat
Open your hatch and watch your valve when you hit the switch. Then you'll know for sure

I guess I am assume the same thing that your saying, which ever way the indicator is pointing to that is the tank on that side of the boat.