Subaru
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join:2001-05-31
Greenwich, CT
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|  heating water
a little question say you have 200 Gal of water indoors that's not moving and you had 2 300W fish tank heaters set to the highest temp which is 86F How long would it take to heat the water up to that temp?
Long story short is someone broke the larger 220V heater and the pump is missing and I can't figure out an easy way for heating the water up so it wont be so cold. |
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davidg
Good Bye My Friend
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join:2002-06-15
Greenville, MS
clubs: | depends on how cold the water is now. 600W is gonna take a while to bring 200 gallons of water up from 70 to 86, not so long from 84 to 86.
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Subaru
1-3-2-4
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join:2001-05-31
Greenwich, CT
clubs: | like 24 hrs or 48hr? |
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rfhar
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Buicktown,Mi
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edit:
October 7th, @10:05AM
| reply to Subaru
What type fish do you have that need the heat. I haven't used a heater for fresh water fish for years. I let the room temperature do the heating. |
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Subaru
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Greenwich, CT
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| said by rfhar  :What type fish do you have that need the heat. I haven't used a heater for fresh water fish for years. I let the room temperature do the heating. it's not a fish tank at all.. it's more like an indoor step in shallow pool. |
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rfhar
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| said by Subaru :said by rfhar :What type fish do you have that need the heat. I haven't used a heater for fresh water fish for years. I let the room temperature do the heating. it's not a fish tank at all.. it's more like an indoor step in shallow pool. 
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cowboyro
join:2000-10-11
Bridgeport, CT
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| reply to Subaru
Assuming no heat loss whatsoever,
Water caloric capacity is 4186 J/kgC
Your energy input is 600W which translates to 2160000 J/h
Your total amount of water is 3.78*200=756 l, mass is ~756kg
Therefore to raise the temperature by 1C (1.8F) it will take you:
2160000/(4186*756)=0.68h or ~41min.
For 1F it will take 22min. |
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Subaru
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edit:
October 7th, @12:48PM
| reply to rfhar
heh I know... I'm draining the pool now with a pump it's going to take a little while..
so the next time I need to heat the pool should I put the heaters on each end of the pool? It's not that big length and width wise just a little deep like up to your knees deep.
heaters are Visi-therm 300W lol someone spent $42 each on them when you can get them far less online....
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davidg
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Greenville, MS
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| reply to Subaru
you do know that those heaters are not approved for the use you are doing? somethign goes wrong and you will be responsible. NEC code is VERY strict when it comes to pool wiring, and for good reason.
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Subaru
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Greenwich, CT
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| pool wiring? nothing is wired at all its nothing but a tub sitting over some carpet. lol and if you want about wires lol back 3 years ago the inspector came over to check the wires before the ceiling was up and wall man did I swear he was going to blow after he had to come by 3 times because the first two failed on electrical. its not like someone is going in the water when the heaters are on.. |
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cdru
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Fort Wayne, IN
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| reply to cowboyro
said by cowboyro :For 1F it will take 22min. This presumes the system is sealed. It doesn't account for thermal loss either to the container holding the water or the air above it. Depending on what the container is made out of, how insulated it is, and how much surface area is exposed to the air, that 22 minutes/degree F could be significantly longer. |
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cowboyro
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edit:
October 7th, @03:28PM
| said by cdru :said by cowboyro :For 1F it will take 22min. This presumes the system is sealed. It doesn't account for thermal loss either to the container holding the water or the air above it. Depending on what the container is made out of, how insulated it is, and how much surface area is exposed to the air, that 22 minutes/degree F could be significantly longer. said by cowboyro :Assuming no heat loss whatsoever, And as a matter of fact the time can be shorter if the environment is warmer  |
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jack b
Big House
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| Let us not forget the sensible heat loss due to the water surface vaporization, (in the form of convective evaporation) and conductive and radiant heat losses to the floor and side wall areas....
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Mchart
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edit:
October 7th, @05:46PM
| reply to Subaru
I can tell you right now that those heaters will not be able to heat the water fast enough if it is not moving.
Also, FISH HEATERS CAN NOT BE USED TO HEAT SOMETHING A HUMAN WILL GO INTO.
I REPEAT
FISH HEATERS CAN NOT BE USED TO HEAT SOMETHING A HUMAN WILL GO INTO!!!
I have seen these fail all the time! I have been shocked by cracked fish heaters when I stuck my hand in the tank! NOT FUN!
Imagine the thing breaking when you are up to your chest in the water! DEAD!
None of this really matters, however. They will be unable to heat the water as it has no circulation around the heaters. More then likely they will crack or the integrated protection that protects the heaters from cracking in an over-heat situation would occur as the water is not moving, not allowing the heater itself to cool off properly.
»freshaquarium.about.com/cs/tipsa···size.htm
A good guide right there. That guide assumes you have circulating water. Ideally, the heaters are right next to the intake of the power filter, or in a sump tank as the warm water is then evenly displaced throughout the tank. Basically, your idea will not work, nor is it safe.
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ptrowski
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join:2005-03-14
Putnam, CT
clubs: | reply to Subaru
This is a bad bad idea, and REALLY think you should not go down this path. |
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HarryH3
join:2005-02-21
Georgetown, TX
·Verizon Online DSL
| reply to Subaru
Here's another solution that doesn't require electricity (though with copper price these days, it would NOT be cheap).
»www.redneckpoolheater.com/
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Subaru
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Greenwich, CT
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| reply to Mchart
some idiot must of ran the other heater dry its I think a 800 watt heater with a pump but the pump is missing and all I found was the heater and the cord has been cut. the thing is it was custom built for how it was before and it would no longer fit on the new setup at all |
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KrK
Heavy Artillery For The Little Guy
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join:2000-01-17
Tulsa, OK | reply to Subaru
This thread reminds me of this 
 |
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jrs8084
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Statesville, NC
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| reply to Subaru
Am I the only person completely lost with this thread?
You have 200 gallons of water, being (or trying to be) heated with fish tank heaters, but it is not a fish tank, but rather an "indoor step in shallow pool" ("sitting on carpet"), which has pumps, but are not working. And, the original heater (run dry) has a cut cord so it is not working.
Indoor portable pools? What is this, a mobile bathtub?
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TheMG
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| reply to HarryH3
said by HarryH3 :Here's another solution that doesn't require electricity (though with copper price these days, it would NOT be cheap). » www.redneckpoolheater.com/ Dude, you just made my day. That is the funniest contraption I've seen in a while! |
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