Are you refering to the pilot light for the water heater? Is yours a manual light or electronic. No, the water heater doesn't need to have the pilot light going when the propane is turned on at the tank(s). Only when your parked and you want hot water do you light the pilot, then your temp sensor will kick on the flame to heat up the water. If you find your water temp is too hot/cool, there is a half moon plastic adjuster with several holes in it that you adjust to set a hotter or cooler water temp.
Matt & Kathie
2017 Grey Wolf 27RR