Hi I'm a new tenant of a two family house in North Jersey, I've been having a problem taking showers due to the water remaining hot for only 5 minutes. I complained to the lanlord but he insists that everything is fine. My Tank is different from his tank and is much smaller. He also has it rigged somehow with the radiator system. In order for me to get more than five minutes, I have to turn up the thermostat that heats the house..Summer is approaching and I'm becoming concerned. Have you ever heard of this or is it my imagination?