AquaHeat Propane or Natural Gas Fired Heating System


The AquaHeat Gas-Fired Heating System is a highly efficient way to heat your aquaponic or hydroponic system. Runs on natural gas or off-grid propane. Have you been searching for a way to keep your fish warm and happy without taxing your electricity? Are you looking for an aquaponic heating system with off-grid capabilities? AquaHeat is the latest in efficient natural gas or propane-fired heating for your aquaponic system.


Dual Zone Upgrade

Provides the ability to run two separate heat exchange coils with independent thermostats off a single heater. This works if you have a decoupled system with two independent sump tanks and you want the ability to manage heat independently for each system.


AquaHeat Propane or Natural Gas-Fired Heating System

The AquaHeat Aquaponic and Hydroponic water heating system was designed with reliability and ease-of-use in mind. The AquaHeat comes fully assembled, mounted, and tested.

How it Works:

When properly installed and operational, the AquaHeat will perform in the following manner.

  1. Propane or Natural Gas is supplied to the AquaHeat unit. (Unit must be properly connected to gas service and tested following instructions)
  2. Power is supplied to the digital thermostat controller
  3. The temperature drops below the set point, measured by the thermostat wire in your sump or fish tank
  4. The digital thermostat controller activates the DC circulation pump to move water through the heat loop (indicated with a mechanical pump sound)
  5. Water pressure activates gas flow (indicated with slight hissing sound)
  6. Water pressure also triggers the igniter which is powered by the D batteries (indicated by clicking sound)
  7. Gas ignites flame to start the burners and heat water
  8. Water is recirculated through the AquaHeat and the stainless steel heat exchanger (located in your sump or fish tank). The heat exchanger should always be submerged. 
  9. Heat is exchanged between the heat exchange coil and the water in your aquaponic system.
  10. Once the temperature reaches the high temp set point, the thermostat turns off the DC circulation pump. 
  11. This in turn shuts off the gas flow and allows the boiler to cool down.
  12. Once the thermostat detects the system water has cooled below the low set point, the process repeats.

System Features

  • All AquaHeat systems come with a natural gas or propane hot water heater. The heater unit must be vented following the instructions provided with the unit.
  • The entire heating system can be run off a car battery with the supplied 12 v battery cable
  • DC circulation pump – used for circulating hot water through the stainless steel heat exchanger and the heater unit.
  • Thermostat controller and sensor wire
  • 50′ Compact Stainless Steel Immersion Coil
  • Fully Mounted and plumbed on backer board
  • Ready for hookup to gas service

Hot Water Heater Product Details Standard to All Systems 

  • Automatic Electrical Pulse Ignition with No Standing Pilot and No Electric Hookup Required (Operated by 2 Size-D Batteries, Not Included);
  • IC Water Control Device;
  • Ultra Low Water Pressure Start-up;
  • Thermal Efficiency: >=85%;
  • Gas Pressure: 2800Pa (0.41 psi)
  • Exhaust Type: Duct;
  • Gas and Water Inlet/Outlet: 1/2″;
  • Winter/Summer control;
  • Min/Max Water Flow Adjustment;
  • Flame Adjustment for Temperature Setting

Safety Features Standard with All Systems

  • Gas leak and overheating safety control;
  • Flame failure safety device;
  • Incomplete combustion safety device;
  • Anti-dry combustion safety device;
  • Over water pressure protection device;
  • Auto cutoff protection in case of accident.

Specific Heater Specifications by Size

6L (1.6 GPM) Liquid Propane or Natural Gas Tankless Water Heater

  • Thermal Output: 12,000 Watt / 40,900 Btu/h
  • Temperature Rise: 45 degrees F at 1.6 GPM
  • Minimum Working Water Pressure: 40 psi
  • Dimensions: 17 1/4″ H x 12″ W x 5 1/2″ D
  • Net Weight: 12 lb
  • Requires Vent (3″ Double Wall Flue), Not Included.

10L (2.65 GPM) Liquid Propane or Natural Gas Tankless Water Heater

  • Thermal Output: 20,000 Watt / 68,242 Btu/h
  • Temperature Rise: 45 degrees F at 2.65 GPM
  • Minimum Working Water Pressure: 40 psi
  • Dimensions: 23″ H x 13″ W x 7″ D
  • Net Weight: 19 lb
  • Requires Vent (4″ Double Wall Flue), Not Included.

16L (4.23 GPM) Liquid Propane or Natural Gas Tankless Water Heater

  • Thermal Input: 32,000 Watt / 109,260 Btu/h
  • Temperature Rise: 45 degrees F at 4.23 GPM
  • Minimum Working Water Pressure: 45 psi
  • Dimensions: 27″ H x 16 1/2″ W x 8″ D
  • Net Weight: 30.20 lb
  • Exhaust Pipe: 5″ double-wall type B vent pipes (not included)

Not Included

  • 2 standard D-cell batteries
  • 12V DC deep cycle marine battery
  • Requires Vent (4″ Double Wall Flue), Not Included.

NOT for heating potable water.


Estimating Your Propane or Natural Gas Usage For those of you who would like to estimate your propane or natural gas usage, here are some handy formulas. Step 1. Calculate your desired temperature increase. Temperatures are in degrees Fahrenheit. Goal Temperature – Starting Temperature = Temperature Increase e.g. 75 degrees – 60 degrees = 15 degrees Step 2. Calculate the energy required to heat your fish tank to your goal temperature. Volume is in US gallons. Energy is in BTUs. Temperature Increase x Fish Tank Volume x 8.34 = Required Energy e.g. 15 degrees x 300 gallons x 8.34 = 37,530 BTU Step 3. Calculate the volume of propane or natural gas required to heat your fish tank to your goal temperature. (Propane BTU Conversion Factor: 91,333. Natural Gas BTU Conversion Factor: 85,250.) Required Energy / BTU Conversion Factor = Required Fuel e.g. 37,530 BTU / 91,333 = 0.41 gallons of propane required e.g. 37,530 BTU / 85,250 = 0.44 gallons of natural gas required / 0.012 = 36.7 cubic feet of natural gas required BTU Conversion Factors were sourced from the US Energy Information Administration. Volume Conversions were sourced from the State of Connecticut Department of Revenue Services.

Go to Top