Very heavy and that is exactly what you need in an outside fountain.  This is a nice concrete fountain and is very sturdy. It has stood the test of time through freezing winters. The only issue is when replacing the water pump. It is very difficult to disconnect the fountain tubing from the old pump and reconnect it to a new pump. You have very little room to work in a very tight space. Very difficult indeed. Must be a better design or way to replace the pump. Otherwise we love this fountain.