The Truma water heater made loud booming noises when igniting. Upon inspection fire and flames were shooting out of the firebox and engulfing the controls. We shut down the unit by turning off the power switch. We had a new unit shipped to our location and installed by a technician. The old unit was shipped back directly to Truma for inspection . We have yet to hear back from Truma on the status of that investigation. This incident occurred in early January 2022.