Check out the Case studies for more examples of how the system was used in different applications and see what the end user has to say about the systems. Case Studies ... In France a HV-50 was retrofit in the cellar of this house for heating. With space being the main concern, the versatility of Hi-Velocity System was the optimum solution. More ... This house was featured in the magazine This Old House. A single HV-100 was the prefect soultion for the replacement of the existing radiant heating. More ...