Hi all, new pool owner here! When we first moved in to our new house last month, I had a pool company guy over to show me how to clean/vacuum the pool and check chemicals. He also showed me how to turn on this gas (original) heater to the pool and in ground spa, which is separated from the pool by about 5 feet, but share common filter/pump. I took pretty good notes, but apparently not the part about the heater! Its so old I can't even see what brand it is. I have attached some pictures here:
25,000 gallon in ground pool
85x72 in ground spa, separated from pool by 5 feet.