The carbon steel backplate & stainless steel backplate, which one is better for the heat exchanger?
 
The plate heat exchanger is mainly composed of difference amount of stainless steel plates with corrugated shapes. It is the place of energy exchange between the coolant and hot wort. All of the stainless steel plate are pressed together under huge power, which with two backplate outside of them.
 
There are some of suppliers who manufacture the plate heat exchanger totally with stainless steel, even including the backplate. It seems the turnkey stainless steel device is more sanitary for beer brewing, but it is not reasonable design actually.
 
We all know the hardness of carbon steel is much better than stainless steel. All of the inside plates are pressed together with the backplate, so the backplate is easily out of shape under the huge pressure if it without enough hardness. Then there will be gap between the inside plates or between the inside plate and backplate. The result is serious, it may pollute your whole batch of beer. 
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