I have the GNR 50 100 model. I wanted to know if the water pressure can be adjusted/increased. I see a green cap with that says pressure and main burner on the pilot switch. If I turn the screw on the green cap will that increas water pressure from the hot water heater? Also, I have it set on warm dial. What is the minimum setting I should have it at to avoid baterial growth in the tank? Derrik