The area previously used conventional shell and tube heat exchanger as tubes and tube sheet material inconsistent material, running material expansion coefficient differences, resulting in less than two years to run a few tubes from the tube sheet root root fracture, leading to the entire district heating can not be. And because the traditional shell and tube heat exchanger in size, and very tight space station, could not be repaired. Users preferred to replace the production of JAD Group SECESPOL heat exchanger. JAD heat exchanger small size, light weight, easy to install, run the effect is far better than conventional shell and tube heat exchangers, energy efficient advantage to be fully reflected.