RV Hydronic Heater Repair

Model

HHE-200-08x

The models ending in "E" were built with engine preheat pump

The models ending in "M" were built with NO engine preheat pump

Many units have been retrofitted with engine preheat pump

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

This model may also be known as:

HHE-500-08x

Note that the 200 and 500 series use the same components

Changes From Previous Model

This model is a MAJOR redesign of HHE-x00-07x

Exactly like HHE-x00-07x except

Zone pumps now have plastic covers over the moving parts
Engine preheat pump is PLE-100-830 - Stir Pump. NOT AVAILABLE
On this model the entire drain valve is plastic. Replace with Drain Valve Kit or Brass Drain Valve Kit
Use ELX-630-001 electric relay or ELE-630-002-FRU kit that already has the relay attached to a cover.
Has regular size radiator cap.
Filled with Camco -100 Boiler coolant. First model in the Hydro-Hot series to use the special coolant.

Serial number 3653 to .....

Part Notes

Control Thermostat - ELE-014-005
Electric high limit thermostat - ELE-HLT-322 -or- with terminals crimped on ELE-ASY-200-HYD
Diesel high limit thermostat - ELE-HLT-322
Control Board - ELE-PC4-010 This control board will directly replace the 008 and 009 models. You may have to crimp different (larger) terminals on 12-VDC supply wires.
Tank level sensor (float switch) - ELX-800-002 - Brass float
Zone, stir and engine preheat pumps (are no longer available). Pump upgrade kit, here: PLE-100-905-FRU
Radiator cap - PLX-102-229
Uses ‘clip on’ Low Temperature Cutoff Thermostat - ELE-LTC-505
Electric system uses electronic relay, which did not hold up well. Replacement electric relay pop riveted to cover ELE-630-002-FRU
Reconditioned Webasto burner - WPE-905-834-R

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

Common Problems

Stir pump failure - Upgrade kit, here: PLE-100-905-FRU
PLASTIC DRAIN valve. If you still have plastic in the drain valve, you should immediately replace it with brass,

Service Manual

On Aqua-Hot website HHE-200-08E Scroll down page in "Discontinued Hydro-Hot Products" section