I'm going out on a limb posting here, but I'm really at a loss. I live in an apartment, built roughly 30 years ago. In the last two weeks I've had to call maintenance as I've lost hot water. Each time, he fixes it I can hear the gas start and then we have hot water shortly after. However, by the end of the day the hot water disappears, and by the next day there is none to be found. It seems like there is a problem with the water heater communicating that more water needs to be heated, but I'm not particularly handy in this respect.
I don't think our maintenance guy knows what he's doing, he assured me last time the hot water wouldn't go away again. But, surely enough, it did by the end of the day. It's not actually that big of a deal, I can deal with a cold shower, so there is no rush. I would like to have hot water eventually, though.
Is this something I can fix on my own? If so, what should I be looking for? Or should I break down and call a different maintenance guy? I've attached a picture of the heater for reference, to see if anything stands out as blatantly "wrong". Please beware that I'm new here, if another picture is needed, let me know.