Surburban water Heater

[racebitz]

H Folks

First, I hope everyone is staying safe in these strange times. If you are housebound, like me then perhaps you are using some time to make a few repairs.

I am trying to understand my little water heater. It worked fine for ages, but at some point last year the little red light in the switch wouldn't come on, and I honestly did not have time to look at it too much.

I have some time now, and cannot make head not tail of the thing. I understand it is propane, but cannot see the temp sender unit etc.
Can anyone enlighten me further?

The label is too faded to read the model type.

Thanks in advance.

Patrick (Indianapolis)