First are you sure there's water in the Water Heater?? If you have a good flame going and still no hot water, sounds like the Water Heater Bypass is in bypass mode. If so and with no water in the heater, means the electric element is probably toast.
Michelle & Ann
2018 Chevy 3500HD Crew Cab High Country DRW, D/A, 2016 RW39MB, Dual ACs, Auto Level, Auto Sat Dish, Stack W/D, King Sleep #, 17.5" Sailuns w/Disc, MORryde IS & Pin, Comfort Ride Hitch, 5.5 Onan, Res Fridge & Induction Cook Top