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URGENT - Please Help with Electrical Inline Water Heater with Temperature Controller

Hi everyone!

I am a koi hobbyist living in Montreal, Canada. I have an 8000 gallon outdoor pond in which I have 24 koi, ranging in size from 12" to 24". I could or should I say "should" leave them outside for the winter, but I've opted to bring them inside now for many years. I used to have 3000 gallons in my basement winter set up, split between two tanks. One, which was a 1700 gallon above ground pool developed several leaks over the years, so I trashed it last summer leaving me with the one tank, a 1200 gallon capacity. Needless to say, this year fish are very stressed due to being overcrowded. I could give you plenty of more details as to how I care for them,may need for a hospital tank, but I'd rather get straight to my question. :)

Two fish have developed two small ulcers which I am currently treating, but I need to raise the water temperature from its current 60 degrees F to 76-77 degrees F.

I'm on a restricted budget (unemployed), so I am not in the position to purchase an expensive inline spa water heater or anything else in the same price range.

I've attached a couple of videos of DIY inline heaters, easy to make for under $100., but need to know what supplies I would need to change up if going with a higher watt system. I would like to use either a 1500 or possibly 2000 watt element. I'm assuming that the first video below is a 1000 watt or less, because nowhere is wattaged mentioned (unless I missed it). Second video is well under 1000 watts.

So if any of you have experience with these type of DIY devices, kindly advise the correct parts required, meaning: element, size of thermostat controller and If I need a solid state relay? The relay part has me confused as I have never used one in any electrical application. Remember, this is for a 110 outlet, which already has a 1/4 horsepower pump and a hefty air pump plugged in to. What amps should I have on this circuit? (maybe I need to call a licensed electrician to increase amps at my electrical box?)

So here are the a couple links for the general idea.
Please answer ASAP as my two sick fish need more warmth in order to heal.

Chris


https://m.youtube.com/watch?v=YQ8vUUpwYgU
https://m.youtube.com/watch?v=QWZ3qQ3R8_A

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Hey Steve, thanks for asking!

Fish are doing great! All healthy and ready to be put outside in a week or two (we've had a cool spring). As a matter of fact, a koi friend of mine came over just yesterday and helped in photographing and measuring all my koi. I'm selling some off as I want to reduce my fish load. It was a good time to inspect each one individually and I was happy to see up close that all are totally well. My friend was impressed with my "heating set up, which got me thinking about you and a few others on this forum.... So thanks again for coming to my rescue in my hour of need... You're a good guy!

Here are a few pics of the ones you helped save!

Have a great day and summer and once a gain, thanks for being so helpful!
Chris
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Another pic...
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One more (this one was really in a bad way...)
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And one more...
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Glad to hear.  They are beautiful.

Take Care

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