Hello, I was reading the comments and I agree that those exams are filled with potential loopholes, but just for the sake of it : a 45 gallons bathtub is not a small one, it is the size of a normal bathtub. http://www6.sears.ca/webapp/wcs/stores/servlet/ProductDisplay?storeId=10001&... The model shown there is 45 Brit. gallons which is approx. 200 liters. That question is reasonably formulated in my opinion. I think that the one I have at home is smaller...! Simon Plouffe