RV Hydronic Heater Repair




This model may also be known as:


AHE-600-DE1, 600-D

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




Changes From Previous Model


  This model is VERY similar to the previous model - AHE-100-04S


  • White painted (powder coat) case.
  • Pumps are attached to case using nylatch fittings (not pop riveted to the case)
  • Has brass drain valve
  • Brass tank level sensor (ELE-800-002) (not plastic)
  • Dual 1650 watt electric elements


Part Notes


  • Control Thermostat -   ELE-014-010
  • Electric high limit thermostat - ELE-HLT-322   -or- with terminals crimped on  ELE-ASY-300-HYD
  • Diesel high limit thermostat -  ELE-HLT-322 
  • Control Board -  ELE-PC4-010
  • Electric relay(s) - ELE-630-001
  • Tank level sensor (float switch) - ELE-800-002
  • Zone and engine preheat pumps (are no longer available).  Pump upgrade kit, here: PLE-100-905-FRU
  • This model uses the special GRAS (generally recognized as safe), Camco -100 Boiler coolant.



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

Common Problems


  • 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-600-D01   Scroll down page in "Discontinued Aqua-Hot Products" section