Steven Levy Enterprises buys and sells new, unused, and used industrial surplus heat exchangers. Browse our inventory of used heat exchangers available for purchase. Heat exchangers are a system used to transfer heat between two or more fluids. Heat exchangers are used in both cooling and heating processes. The fluids may be separated by a solid wall to prevent mixing or they may be in direct contact. These media may be a gas, liquid, or a combination of both. Tell us what surplus heat exchangers you have for sale or call us at 713-910-4337.