Here's a mod I reported on previously but was lost:
Suburban water heaters come in three basic flavors:
1. It has a pilot light
. It's manually pilot lit.
2. It has a pilot light
. It has a "sparker" that will light
the pilot, or you can light it manually.
3. It has NO pilot light. When the water is cold the DSI unit opens the gas, a sparker lights
the burner, the water heats up then the DSI shuts everything off again until the water needs to be heated up again.
There is also something that is called the "On Demand" water heater system. I'll let Charles describe it's intricacies.
My Suburn water heater was the manual light model. I sometimes have problems with the pilot blowing out. It also can take a bit of time to get the gas to the pilot the first time you light it on a trip. I can be impatient. And my thumb tires
holding the pilot button down.
I decided to buy the aftermarket (Suburban) sparker to install. It was about $80 from Camping World