WHAT IS DRYAIR? The DRYAIR Glycol system utilizes a water heater to heat a water/glycol heat transfer fluid. The fluid is then pumped to remote portable heat exchangers. The portable heat exchangers' primary components include a hydronic coil and fan. The fan draws air over the hydronic coil, the air, which is heated by this process, is re-introducd to the work site. One water heater can supply multiple portable heat exchangers. It also does not require a boiler ticket under pressure vessel regulations!