No hot water.
Burner Chamber obstructions preventing constant ignition needed for water to heat.
Due to evidence of advanced age and damage caused by the fire, it was recommended this entire water heat be replaced.
We replaced a water this week that had caught on fire briefly. Upon inspection, we noticed most of the wire insulation had been on fire, and the burn chamber was thoroughly obstructed by heavy corrosion and insect nests. The fire is suspected to have been caused by these obstructions. Thankfully, no one was hurt and we were able to replace this unit like for like.
Let this be a reminder to keep bug screens on your appliance exhaust areas, and do at least a yearly inspection to ensure there are no obstructions.