RV Hydronic Heater Repair



Serial numbers 04-534 to

This model may also be known as:


AHE-120-04X, AHE-130-04X, AHE-140-04X

These are models that were built with dual electric elements

This model of Aqua-Hot uses the special Camco -100 Boiler coolant.




Changes From Previous Model


  • Had plastic / PEX drain valve (see comments below in common problems)
  • Uses ELE-630-001 electric relay.


Part Notes




Routine service parts and kits - Routine Service Parts      Scroll down page for filter and nozzle packages.

Common Problems


  • The PEX / plastic drain valve should be replaced (most have already been done), here:  replacement Drain Valve
  • The PEX water lines should probably be routinely replaced.  If you have fresh water leak, then the rubber gaskets in the PEX fitting are hard and not sealing well.  Water Line Kit
  • Radiator cap should be replaced at least every other year (or as often as needed).  PLE-102-229  or Cap with Lever PLE-108-229-L

Service Manual


On Aqua-Hot website   AHE-100-04S