Aqua-Hot 125D Ultra-Compact Hydronic Heating – Class B RV (Diesel) Complete Kit


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SKU: AHE-125-DIESEL-KIT Category:


The compact Aqua-Hot 125 can be installed inside/under cabinetry or furniture. This highly efficient system operates as the van’s heating system and continuous hot water supply. As many as 3 heat exchangers (black units in photos – included) can be placed throughout the van to bring heat where needed. The burner is installed on the underside of the van chassis for noise reduction and exhaust.
  • All in One Unit – Fast and easy installation, one unit provides heat and continuous hot water.
  • High Altitude Ready – Adjusts O2 and fuel mix to optimize flame for altitudes up to 11,000ft. Will not soot up and does not require the same maintenance required on other systems.
  • Great for Off-Grid – Uses the vans on board diesel fuel for all heating and hot water needs with the option to use the electric element when shore power is available.
  • Continuous Hot Water – 110-120F at .8 gpm for kitchen and all water needs.
  • Quiet – The combustion unit is installed outside the van with its own exhaust, while low decibel fans provide heat inside.
  • Night Mode – Provides ample heat with further noise dampening.
  • Dual Fuel – Either diesel via the van fuel tank or shore power electric.
  • LCD Controller – Up to 3 independently controlled zones, intuitive controls -plus test and diagnostic tools.

LCD Touch Screen Controller Manages the entire system

Compact 11 ½”H x 7 ½”D x 17 ¾”W

This Kit includes three quiet and compact (13 ½” x 6 ½” x 4”) heat exchangers can be placed where heat is needed

Complete Kit Contains:

  • AHE-125-D              Aqua Hot 125G   (1qty)
  • EXE-103-0EX          Exchanger, Heat Cozy III  (3qty)
  • PLX-284-74V           Hose, Molded, Elbow 90*, 3/4 X 3/4 X 10 long, AH/HH (4qty)
  • PLX-CTB-270          Clamp, Hose Constant Tension Hose Clamp 15/16 in. for ¾” Hose (8qty)
  • PLX-A51-106           Bend Support, 5/8, Polytube (4qty)
  • PLX-120-626            5/8″ Oxygen Barrier Red Pex 100 Ft (1qty)
  • PLE-000-201            8 Ft. Section of 5/8 in. Safety Stripe Rubber Hose (1qty)
  • ELE-100-111           125 Harness Kit (1qty)
  • ELX-THM-309        Thermistor- White (2qty)
  • PLX-T44-006           Fitting, Insert Modified Brass (6qty)

Additional information

Weight 60 lbs
Dimensions 11.5 × 7.5 × 17.66 in


Power Source


Heating System

Mounting Location

Control Style

Manufacturer Part Number




Manufacturer Warranty

Number in Pack



Size Type

Condition New


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