Here we have a complete good used fully functioning aqua-hot hydronic heater system removed from a 2004 Newmar Essex 4503 class a motorhome which suffered a front end collision. This aquahot was winterized and functioning at the time of the collision. This will fit a variety of applications. Im also parting out the rest of the rv, so If you need anything please send an email so I can list it on ebay for you.