... certification high efficient,stable performance, it is widely used solar flat panel heater Working principle:There have three parts of the split ... or electric heater.Specification:1.Inner tank: SUS304 2B food grade stainless steel.2.Outer tank: white color steel or Stainless ... :-35C6.Capacity:100L,150L,200L,250L,300L,400L,500L solar flat panel heater