RV Hydronic Heater Repair
This model of Aqua-Hot uses the special Camco -100 Boiler coolant.
This model may also be known as:
The AHE-400 model is the same as AHE-450 model except that there is no dedicated stir pump (uses zone pump #2 to stir coolant) and there is no engine preheat pump.
|You need to replace gasket if you remove combustion chamber, here HDE-700-205|
On Aqua-Hot website AHE-400 Use Service Manual for AHE-400-D