Update on the Wood Burning Pool Heater How Well Does it Work

I have had quite a few requests to provide some more detailed information on how well the wood burner works.  I would like to share some temperatures with you using a AGPtek Dual Two Channel Digital Thermometer.

I have been very happy with how well this pool heater has worked for us this year. We have had such a cold summer here in Michigan this year and this heater has been one of the only reasons we have been able to enjoy the pool. Normally, the solar heater and solar cover can keep the pool comfortable but this year it has just not been adequate. I have run the wood burning heater only when needed, maybe once or twice per week at the most. We have been able to easily keep the pool temperature above 75 degrees so far this year.

The numbers and methods here are just for rough estimation of how well the heater works, this is not meant for the science books, but should hold true with a heater of similar size and efficiency.

I measured about 69 gallons per hour with a 33 degree average warm up to the water. This was with an average sized fire going as the temperature here will fluctuate as you add wood and let it burn through. I have seen it as high as 45 degrees and as low as 15 degrees, so it just depends on how much and what material you are burning.

Calculations I used:  15,000 gallon pool divided by 69 gallons per hour (filled one gallon in 52 seconds) gave me 217 hours to heat all of the water 33 degrees. Or if you reduce, it comes down to about 27 hours for 4 degree rise for the entire pool. You can also just divide 33/217 to get a coefficient that can be used to create a formula. Y = .15x where Y is the degrees you will heat 15000 gallons of water and x is the number or hours you run the heater. So if we plug in 24 hours for x we get y=3.6 degrees Fahrenheit.

Hopefully that makes sense to be used as a ROUGH estimate for calculating how much you can heat a similar sized pool.





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This post has been shared at:  The Homestead Barnhop, Simple Saturdays Blog Hop, The Backyard Farming Connection Hop, Natural Living Monday, Frugal Crafty Home Blog Hop

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Aquaponics Does it Taste Like Fish Poop

Youre growing food in fish poop?  Yuck!  This is a common misconception or question that many people have when first learning about aquaponics. In this video, I try to explain a few quick concepts and talk about what I have grown in my system and what we have liked. This summer, my family has been able to compare the taste of some of the things we are growing with our outdoor garden and have been very impressed with the aquaponics system.



The fish waste in an aquaponics system is almost immediately broken down and consumed by several types of bacteria that grow on the rocks (grow medium) in the system. This bacteria convert the waste into nitrite and nitrate which can be consumed by the plants. There is no real difference in how the plants uptake nutrients whether grown in a garden, hydroponics, aquaponics, or any other method and the taste should be similar. The only thing that effects the taste is whether the plants had all the things they needed to grow properly such as light, nutrients, and water. If they are short on those things or stressed during development you might get bad tasting food. It also depends when you harvest the vegetables as well.



I hope that this quick look at my aquaponics system gives you some insight as to what to expect if you are looking to build something similar at home.









This post has been shared at:  The Homestead Barn Hop, The Backyard Farming Connection Hop, Natural Living Monday, Wonderful Wednesday Blog Hop

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Solar Power and Net Zero

Rainbow over the winner of the 2011 Solar Decathlon

An awesome thing about living in DC is access to events. This fall the Department of Energy held a Solar Decathlon, showcasing almost 20 homes that incorporated solar energy with various energy-saving designs to achieve "net zero" energy use.

Unfortunately, these were houses where folks would live, not greenhouses. But many of the ideas still apply. Some of my favorite ideas out of this conference:

• Grey water collection and treatment (the winning home used this in a water feature, eventually resulting in water clean enough to water their garden).
• Vaccuum tube solar water heaters (the winning home used this in a vertical wall that was absolutely gorgeous)
• Passive heating or cooling

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15 How Much does this Cost Under 1000

Heres a run down of the amount I paid for this system, with suggestions on how you can reduce costs even further.

Tanks - $440 - I was able to get the Rubbermaid stock tanks at a local farming coop for $70 and $80 for the 50-gallon and 100-gallon tanks, respectively. I think youd need 3 IBC units to make something similar out of IBC, so that wouldnt save much cost. However I understand that its possible to get 55-gallon barrels for free from local beverage processing plants. The downside of 55-gallon barrels is youll have to spend more on plumbing, youll have a lot more cutting to do, and the end result will look like hack-sawed plastic. But free is free.

Hoop house - $100 - If you use pressure-treated landscape lumber for the base, 3 mil sheeting, and 1/2" EMT conduit, the total price rolls in at around $100. You could slightly reduce costs for the frame by using PVC. Or you can decide you dont need protection at all, if youre in a climate that doesnt require protection from excess sun, rain, or cold.

Pumps and timer - $110 - I was able to find my 800 gph pump at a local hydroponics store for $60, and you can get an air pump sufficient to aerate 100 gallons for $30. Tubing and air stones round the total amount upwards to $100. One option is to dispense with the air pump, if you pump some of your water over the surface of the fish tank, oxygenating the water the way a pond fountain does. There are ways to use wind power to drive something like a rope pump, but I dont think that is cheaper than an electric pump (though awfully fun to make). I do use a timer to turn my water pumps off at night, which is another $5-10.

Plumbing - $100 - I used 3" pipe for media guards (4 feet), 2" pipe for bells (4 feet), 1" pipe to connect the tanks (10 feet), and lots of 3/4" pipe for upstands and drains (10 feet). Add in the elbows and adapters, caps, and o-rings and youre up around $40. I used garden hose that is drinking water safe to carry water from my sump tank to the grow beds, so two 50 foot lengths, adapters, and Y splitters ran me $60. You could reduce cost by having a simple standpipe and using a timer to turn the water on intermittently, though your water pump capacity may need to increase. As for plumbing between the sump and the beds, you could plumb that with PVC pipe and elbows. If you find a cheaper way to do it, after tallying all the costs, go for it.

Grow bed supports - $60 - I used cinder blocks (16 @ $2.50) and 2x6 planks (4 @ $5) to support the grow beds. If you are able to dig your tanks down into the ground, you can cut back on the number of cinder blocks required. If you can find such materials second hand, thatd be great.

Floating Raft - $40 - I was able to get a 2x8 sheet of 2" extruded polystyrene for $15, and the 2" net pots cost $0.39 apiece. I suppose you could come up with some kind of wood float supported on empty water bottles and used (drilled) plastic containers.

Media - $ to $$$ - If youve got a pile of 3/4 gravel out back, this could be free. If you fill all four grow beds with Hydroton (@ $40 per 50L bag), you could be spending about $600.

So the basic system as Ive got it here (including a floating raft bed) is $850. I love Hydroton, but I know of a friend who got an entire truckbed full (1250L) of expanded shale for under $60. So you can create an extended-season, vegetable-growing, fish growing water storage system for under $1000.

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