The one on the left I expect is the water heater... same switch/light I had on my 2000 Infinity... I believe the light turns on initially - then goes out once the propane burner ignites... but would have to check that... Haven't had that rig in a few years... Needs 12v power and propane.
The other two are to power heating pads attached to the gray and black water tanks - if camping in freezing conditions to help prevent the waste tanks from freezing... Needs A/C power typically.
Have a 2014 Hurricane now - and overall happy with it.. Hope you enjoy it!
Not yet retired...
Florida (Michigan transplant)
2014 Hurricane 32A
2000 Infinity (previous)