The material of construction of the housing and jacket will be determined by the material that is being conveyed, the temperatures that will be encountered, the atmosphere the equipment will operate in, the fluid that is being used in the jacket, etc.
Most jacketed housings have baffles in them for the control of the fluid running through them. Great care is taken with the baffle design and placement to make sure that the fluid path does not leave any dead spots in the jacket. When the jacket is for the purpose of fluid containment only coming from a perforated housing then baffles are not used.