yes, they can be more than 300 lbs. there is a stove that can weight to about 900 lbs.
A standard 4 burner gas stove weighs 150- 170 pounds
somewhere between 5 and 10 pounds
Since a stove is quite a heavy object, it would be best measured using pounds. Ounces are smaller (1/16th of an imperial pound) and make less sense for weighing large objects.
A stove wattage usually ranges from 4000-6500, depending on the type of stove.
A gas stove does not use any electricity.
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A Watt is a measurement of electrical power, a gas stove has none.
From personal experience, a 40 lb. bag will fill a five gallon pail heaping and spilling over a bit. So, a five gallon pail will hold approximately 35 pounds of wood pellets flush to the top.
There are many available stove top grill available online for purchase. One of the example of a good quality stove top grill is by the company Chefmaster.
Stove appliances can be bought from many different stores and retailers. Some examples of stores that sell stove appliances include Sears Outlet and Bed Bath & Beyond.