RV Hydronic Heater Repair



This model may also be known as:


AHE-600-DE3, AHE-600-D03

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




Changes From Previous Model


  This is the current model that is available from Aqua-Hot. 


   Details on Aqua-Hot website, here:  AHE-600-D03


   This model has dual 2000 watt electric elements.


  • This model is very similar to the previous AHE-600-DE2 model
  • There have been several zone pumps used.  I do not have detailed information at this time.


Part Notes


  • Control Thermostat -   ELE-014-010
  • Electric high limit thermostat - ELE-000-616-FRU
  • DUAL Diesel high limit thermostat - Thermostats are wired in series.  If one trips, the burner will shut down / not light   ELE-HLT-425
  • Control Board -  ELE-PC4-010
  • Electric relay(s) - ELE-630-001
  • Tank level sensor - This is the upgrade sensor  ELE-800-006-FRU
  • Zone and engine preheat pumps (are no longer available).  Pump upgrade kit, here: PLE-100-905-FRU
  • Gasket that goes between the combustion chamber and the Aqua-Hot   HDE-700-205
  • 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.  You should have the fiber gasket on hand in case you take the combustion chamber out.  HDE-700-205


Routine service note:  The Aqua-Hot service directions clearly state that the combustion chamber should be removed each time unit is serviced.  Most of the service people that I know remove the air swirler as shown in photo below.  They Inspect the inside of combustion chamber with flashlight.  If there is very minimal carbon built up (which they find in most instances), they do not remove the combustion chamber.

Common Problems


   None that I know of.

Service Manual


On Aqua-Hot website   AHE-600-D03