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1 MILLION pounds of Food on 3 acres. 10,000 fish 500 yards compost

Aquaponics: 20,000 lbs of Fish + 70,000 Vegetables per 1/4 Acre with Portable Farms

Duckweed as food

Aquaponics using TILAPIA


Aquaponics Tank Heater

This heater is capable of heating my 950 litres (250 gallon) Aquaponics System 2 F degrees (3.6 C) an hour . My system is located in my closed 2 car garage so you mileage may differ depending on where you system is locate at and the number of gallons of water your trying to heat. But I’m having no issues with keeping my tank at between 80F (26.6C) and 82F (27.78C) for my Tilapia. Bob is running a 300 gallon system at 77F (25C) and is have no issues either.

This tank heater will cost you about what 3 quality 300 watt Aquarium heaters will cost you and with this heater you have three or 4 time the capacity to keep your tank at the proper temp. I also highly recommend insulating your tank. Mine isn’t and this thing is keeping my tanks at the right temp and heating my whole garage. I was running 6 250 watt aquarium heaters and could never keep my tanks at the proper temp. So far with this tank heater, water temp has never been and issue for my application. I’m also using half as much electric to do it.

DIY IBC Fish Tank Heater with Digital Temperature Controller

Solar hot water heater


300W will heat 1000 litres (246 Gallons) of water by one degree celsius (1.8 degree fahrenheit) in about 4 hours, assuming no losses. Most systems have heat losses, so you might ned more energy to keep the heat stable.

How to check how efficent is your system: Run the 300W heater for 24 hours and measure your water temperature at the start and end, and you can calculate how much energy was lost during that period.

For example, lets say you started at 15C(59F) , and 24 hours later it was 19C (66.2F), then we know the useful energy retained was 16720kJ, or 4.64kWh. You put 7.2kWh into the system via a continuous heating rate of 300W, so the system has lost 2.56kWh or ~9200kJ, via convection, conduction, and some radiation. The aim is to minimise the losses, in order to minimise the cost of running the system. Of course, solar heating is free to run, but there is a significant set-up cost.

Heat pumps are much more than 100% effficient, but the cost of one for a small system would never be recovered by the savings, especially if you insulate the system well.