RV Hydronic Heater Repair

Hydronic Heater Models

 

This information compiled by Roger Berke and is a work in progress.
If you have photos / information, I would appreciate corrections or additions.
Scroll Down! Models are listed below. This page is very long.

431 Series of heatersAHE-600-DE12001-EAHE-450-DE1
431/12 - Prior to serial 94180AHE-600-DE2

HHE-102-0EE

AHE-450-DW1
431/12 - Serial number from 94181 to 98571AHE-600-DE3 (current model)HHE-x00-03xAHE-450-DE2
431/12 - After serial 98572 HHE-x00-04xAHE-450-DW2
411/12AHE-675-DE1HHE-x00-05xAHE-450-DE3
AHE-101-000AHE-675-DE2HHE-x00-06xAHE-450-DW3
AHE-100-00SAHE-675-DE3 (current model)HHE-x00-07xAHE-450-DE4 (current model)
AHE-100-01S HHE-x00-08x 
AHE-100-02S HHE-x00-09xAHE-375-DE1 (Beckett)
    
AHE-100-03S Series of heaters LP ModelsAHE-400-DE1
AHE-100-03S AHE-375-LPAHE-400-DE2
AHE-100-04S AHE-400-LP 
    
    

Model Notes

The heaters in the 431 series are all very similar.  Click on serial number range for details.

 

The heaters starting with the AHE-100-03S have an electronic control board and should be filled with the special Camco -100 Boiler coolant.  Different types of coolants should NEVER be mixed.

 

There have been many, many variations of models that were built for a specific manufacturer.  Most of the Aqua-Hot heaters that are in the Newell coaches have dual elements and have slightly different model numbers.

 

The Hydro-Hot 200 series and 500 series are identical and are shown in the model listing as "x".

 

The Hydro-Hot series models ending in "E" have an engine preheat pump.  The "M" models have engine coolant that circulates through the heater when engine is running, but no preheat pump.  Last letter in model number is shows if heater was built with pump.  Shown in the model listing as "x".  Many heaters have been upgraded to add the engine preheat pump, which would not be reflected in the model number.

 

Not every Aqua-Hot model uses the 'special' propylene glycol boiler coolant (Camco or Century).  Each model listing shows what 'standard' coolant should be.  If heater has label on expansion tank or heater, then that would override 'standard' coolant.  Some of the Foretravel AHE-100-02S heaters were filled with the Camco coolant.

 

 

Aqua-Hot Models Coolant
431/12 - Prior to serial 94180
431/12 - Serial number from 94181 to 98571
431/12 - After serial 98571
411/12

AHE-101-000

AHE-100-00S
AHE-100-01S
AHE-100-02S
AHE-100-03S
AHE-100-04S
AHE-600-DE1
AHE-600-DE2
AHE-600-DE3
 
Hydro-Hot Models  
2001-E
HHE-102-0EE
HHE-x00-03x
HHE-x00-04x
HHE-x00-05x
HHE-x00-06x
HHE-x00-07x
HHE-x00-08x
HHE-x00-09x
AHE-450-DE1
AHE-450-DE2 
AHE-450-DE3 
AHE-450-DW3 
AHE-450-DE4 Serial  
AHE-450-DE4 Serial  
AHE-450-DE4 Serial  
AHE-450-DE4 Serial  
   
Propane Models  
AHE-375-P01  
AHE-400-P01  
   
Beckett Models  
AHE-375-D01  
AHE-525-D01  
AHE-525-D02