I just moved in a house, and I am wondering what type furnace I have...It is believed to be original to the structure, which is 36 years old. I can take some pictures of it. It works well, but it is outdated- Has no hot water storage tank, no name I can see on the side panels, and it is in a utility closet in my kitchen. The only thing I see happening is the hot water pressure is about 60% less than the cold. Also, if you take even a reasonably long shower, you run out of hot water. Any ideas on what may be wrong? And what type furnace this is? I can take pictures if nec.