These are pressureless steam cooking ovens. Often referred to as atmospheric steamers, they cook gently without destroying delicate foods. They are great for cooking a range of fish or vegetables and are very popular with schools.
Pressureless steam cooking retains as many nurtients in the food as possible, because of the gentle process which doesn't destroy vitamins and minerals in food. It's slower than pressure steam cooking but allows delicate to vegetables and fish dishes to retain their structure.
While most customers opt for a combination oven solution, these simple steamers still have a role to play in the commercial kitchen. They lack the precision of a combination oven, but are very reliable and deliver consistent cooking results with steam.