10 posts in this topic

What are the best heaters for an unheated hoop-house style greenhouse? I am referring to water heaters, not air/space heaters. I was hoping to heat the tank, and have that act as a thermal mass... 

 

Thanks!

Old Prospector likes this

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Electric heaters can cost you in electricity/money considerably,   

A propane instant water heater can be rigged to circulate through pipe in the fish tank and that can give you precise control, but again $$$.

For low cost, solar water heater works out to be the cheapest, but you have the least control and amount of heating can vary widely.

You're in a place that can get pretty cold in the winter.  How warm are you trying to keep the water over outside temps?

Points to consider.

1.  copper coils in heaters/water heaters can  release copper ions into the water and become toxic to your fish.  There are variables such as water hardness, pH, and the kind of fish your raising that makes the copper more or less dangerous.  You might do fine with copper or you might start loosing fish one or two at a time to poisoning. 

2.  If you flood and drain a grow bed filled with large pore media such as gravel or hydroton, the bed will act as a radiator and radiate your heat, so limiting flood cycles at night is very important if you want to retain heat.

3. If your not real careful , your fish can cost you $100 each due to heating.

Best of luck with your adventure.  

bigdaddy and FoxWoodRunFarm like this

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Amazon

Allied Precision 7521 Floating 1,500-Watt Pond De-Icer/Heater

Floating De-Icer. Heaters, De-Icers And Floats  Size: 8.25" dia.

Price: $33.95 & FREE Shipping
  • Manufacturer: ALLIED PRECISION INC P
  • Manufacturer part number: 7521
  • Floating pond de-icer/heater; perfect for garden ponds
  • Keeps portion of pond surface free of ice; releases gases that might otherwise harm fish
  • 1,500-watt motor; 6-foot power cord; requires standard 110-volt household electricity
  • Thermostatically-controlled; automatic shutoff; rugged, plastic housing; patented design
  • Full, 1-year warranty
FoxWoodRunFarm likes this

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8 minutes ago, Old Prospector said:

Amazon

Allied Precision 7521 Floating 1,500-Watt Pond De-Icer/Heater

Floating De-Icer. Heaters, De-Icers And Floats  Size: 8.25" dia.

Price: $33.95 & FREE Shipping
  • Manufacturer: ALLIED PRECISION INC P
  • Manufacturer part number: 7521
  • Floating pond de-icer/heater; perfect for garden ponds
  • Keeps portion of pond surface free of ice; releases gases that might otherwise harm fish
  • 1,500-watt motor; 6-foot power cord; requires standard 110-volt household electricity
  • Thermostatically-controlled; automatic shutoff; rugged, plastic housing; patented design
  • Full, 1-year warranty

These are the exact same ones we use in the horse troughs... :)

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1 minute ago, FoxWoodRunFarm said:

These are the exact same ones we use in the horse troughs... :)

Horse troughs make good fishtanks also :D

bigdaddy likes this

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Hi FWRF

I doubt that deicer is usefull to heat the tank, it turns off automaticaly once the temp. goes above 32F.

So to keep a hole in the icesheet it's OK, but no good as a heater, in particular if you plan for blue tilapia.

You need a heater with a thermostat that can be adjusted up above minimum letal temp.  for the specie of choise.

cheers

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7 minutes ago, ande said:

Hi FWRF

I doubt that deicer is usefull to heat the tank, it turns off automaticaly once the temp. goes above 32F.

So to keep a hole in the icesheet it's OK, but no good as a heater, in particular if you plan for blue tilapia.

You need a heater with a thermostat that can be adjusted up above minimum letal temp.  for the specie of choise.

cheers

We haven't decided on what fish, yet. Had a smaller proof of concept in the basement for about a year with just pet store goldfish for a while, before finding a local source of hybrid striped bass (whom is not out of business, dammit) and no supplemental heat. Worked OK, but, we are looking at a much larger, more commercial-ish system... and are still doing our due diligence... #cheers!

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Hi again

Just remember that all fish strugle with temp swings, so keeping them inside a green/hoop house might mean trouble come summer.

So my advice is to keep the fish tank in the ground and/or a separate room, with good insulation including a insulated lid, to protect from the cold/heat/swings.

Before buying/investing in any heating equipment, figure out letal uper/lower limit, and ideal temp (best growth) on specie of choise.

If you go ornamental some fish can do fine on idle (no growth/feeding), during the winter season 

If you go for fish to consume (eat) you can buy larger and harwest, when the cold or heat is to costly to handle.

cheers

 

 

Edited by ande (see edit history)
FoxWoodRunFarm likes this

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One thing that members have done in the past successfully is raise a cold water fish in winter such as trout and then switch to a warmer water fast growing fish in summer.  Then they only have to keep the water from freezing point.  The plants that I've tried to grow, don't do well in water temps below 55F, so also consider what plants you wish to grow in the winter if minimally or not heating the water.

Cecil likes this

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On 11/6/2017 at 3:34 PM, ande said:

Hi FWRF

I doubt that deicer is usefull to heat the tank, it turns off automaticaly once the temp. goes above 32F.

So to keep a hole in the icesheet it's OK, but no good as a heater, in particular if you plan for blue tilapia.

You need a heater with a thermostat that can be adjusted up above minimum letal temp.  for the specie of choise.

cheers

Hey Andy if he was raising Arctic char like you have up your way it might not be so bad. :D

FoxWoodRunFarm likes this

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