Aqua-Hot will be doing inventory July 1st and 2nd and we will also be closed July 4th and 5th in observances of Independence Day. During this time, we will not be shipping any online orders until July 8th. Thank you!
Aqua-Hot 250D diesel heater

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Aqua-Hot Low EmissionsAqua-Hot Made In USA

Ultra-Compact Hydronic Heating

Highly efficient heating and continuous domestic hot water appliance in one compact efficient unit.


  • -  Fueled by diesel and operated by 12V for off grid applications.
  • -  Available with a 110 electric element.
  • -  The all-in-one design of the Aqua-Hot series results in considerable cost and space savings.
  • -  Single, self-contained unit: Delivers residential-style interior heating using heat exchangers and/or in floor heat with the ability to deliver a luxurious supply of continuous hot water at 110°-120°F at a rate of 1.5 gallons per minute. It’s just like the luxury comfort in a traditional home or high-end diesel motorhome.
  • -  Quiet: Low voltage fans provide an almost completely noise free operation.
  • -  Fast Installs: Heating, domestic water, and fuel supply/outlet ports are located on top of the tank for easy connection access. Integrated mounting tray facilitates air intake and exhaust.
  • -  Easy Operation: Heat controlled by your thermostat and endless hot water by simply turning on a faucet.


  • -  Maximum Interior Heat Exchanger Btu/hr 40,000
  • -  Continuous, Tank-less Hot Water of 110°-120°F at 1.5 GPM
  • -  5 Aqua‐Hot Cozy Heat Exchangers
  • -  Fuel Diesel
  • -  Electric Element - Yes
  • -  Size 11.69"T x 12.45"W x 21.61L
  • -  Weight 84lb (empty) 113lb (full)