i have a 3 story little house with 2 bathrooms, one on the 2nd floor, one on the top floor. the hot water comes from a 40 gallon gas hot- water-heater in the basement. i cannot even get enough hot water to fill a bath on the 3rd floor. after about 6 inches the water goes cold. However, when i go downstairs to the kitchen on the first floor, there seems to be plenty of hot water. There doesn't seem to be any sediment at the bottom of the tub so i don' think the pipes are blocked but i guess i could be wrong. can anyone point me in the right direction?