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  1. #1
    Member Rank = Sansai Mirza's Avatar
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    another way of heating

    Maybe this is stupid but it can be a solution for all of us who can not afford to heat the pond.
    If the tap water is already at about 10 degrees, would we achieve something if we trickle in tap water during the winter ..I removed it before winter, because I thought it would get frozen..



  2. #2
    Doing a significant water change in winter was an old idea to replace cold water in a pond with relatively warmer water from the mains. I never thought it a good idea since the pond would continually lose any heat gained by adding mains water so as series of changes would be necessary to keep raising it again. That would cause the temperature to yo-yo which would be worse for the fish than a constant colder temperature.

    Trickling water would be a good idea if it was dechlorinated and if the trickle was fast enough to add a significant amount of heat. However, what would probably happen in a practical situation is that it would have lost heat on the way and, by the time the trickle actually entered the water, it would be much colder and might even be colder than the pond water.


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  4. #3
    Member Rank = Sansai Mirza's Avatar
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    I have a tap built in filter , I dug water pipe into the ground all the way to the filter, the pipes are not directly exposed to the outside temperature ..I will try to raise the temperature with trickling water
    Ponds is covered, but water temperature is 4 degrees celsius ,the only good thing is that I do not have ice .
    these are temperatures from the beginning of this month, the water is very cold even though it is covered
    1.1 5,8°C
    2.1 6
    °C
    3.1 5,2
    °C
    4.1 5
    °C
    5.1 4,5
    °C
    5.1 4,5
    °C
    6.1 4,5
    °C
    7.1 4,5
    °C
    8.1 3,8
    °C
    9.1 4
    °C
    10.1 3,9
    °C
    11.1 3,9
    °C
    12.1 4
    °C
    13.1 4,1
    °C
    14.1 4,1
    °C
    15.1 4,2
    °C

  5. #4
    At 4°C your koi will be at an acceptable temperature where their adaptive immune system will be virtually switched off so they would have to rely on their innate immune system which only provides limited protection. However, parasitic bugs aren't active at temperatures below about 4.4°C so they don't need one.

    Below about 3°C koi will be becoming hypothermic and at about 2°C the enzymes that control body functions will be beginning to shut down so they will be struggling to stay alive. So as long as the water doesn't get any colder they won't die due to the cold but beware of raising the water temperature by a couple of degrees and leaving it at that temperature until it naturally warms in spring. This will leave the koi with hardly any immune system but the bugs will be become active. Not very active but enough to infect the koi and become a much more serious threat as the water warms.

    This effect is usually know as "Aeromonas Alley" and I've written about it here:
    Aeromonas alley

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  7. #5
    Senior Member Rank = Nanasai Skoosh88's Avatar
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    As I haven’t set up my trickle in and out yet I am doing water changes every other day running it for about half an hour at a time. Before the water change the fish nope about at the bottom with their woolly jumpers on and by the end of it all of them are up and about and searching for food. My temp is hovering around the 6 degrees mark but as said I agree that the water change makes a difference


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  8. #6
    Extreme Koi Member Rank = Mature Champion pip895's Avatar
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    At full flow into a relatively small volume I can see a small temp increase occurring - at trickle in speeds I doubt it would be detectable though. Have you been able to measure the difference before and after your water change SK? It should be possible to do the maths on this given we know the volume and difference in water temperature..
    6000g in ground koi pond
    +3000g lily/Anoxic pond attached
    29 koi (40 to 65cm)
    Bottom drain, Mid water & Skimmer to Drum
    JBR boichamber->Blue eco 500 pump ->below surface return.
    Blue Eco 240 -> Large MB -> Waterfall -> Planted Anoxic pond (25 baskets)

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  10. #7
    Senior Member Rank = Nanasai Skoosh88's Avatar
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    Quote Originally Posted by pip895 View Post
    At full flow into a relatively small volume I can see a small temp increase occurring - at trickle in speeds I doubt it would be detectable though. Have you been able to measure the difference before and after your water change SK? It should be possible to do the maths on this given we know the volume and difference in water temperature..
    I haven’t measured the temp as it’s not what I’m doing the water change for but I would agree that it would be an interesting experiment. Next time I change I will measure temp as it is a relatively small volume at roughly 13k litres


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  11. #8
    Extreme Koi Member Rank = Mature Champion pip895's Avatar
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    Very rough calculation assuming there is a 5deg difference between the pond and tap water you get just under 6kW of heat input per m3 of water you change. Sounds quite a lot but over a week you could get the same change by adding a 35w heater to the pond so not going to be a very effective heat source unless you change a lot of water!

    [please feel free to check my maths on this btw no guarantees I've got it right]
    Last edited by pip895; 18-01-2019 at 01:54 PM.
    6000g in ground koi pond
    +3000g lily/Anoxic pond attached
    29 koi (40 to 65cm)
    Bottom drain, Mid water & Skimmer to Drum
    JBR boichamber->Blue eco 500 pump ->below surface return.
    Blue Eco 240 -> Large MB -> Waterfall -> Planted Anoxic pond (25 baskets)

  12. #9
    Senior Member Rank = Nanasai Skoosh88's Avatar
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    Did a little test...

    Before I start I just want to say I don’t usually do a water change of 30% in one go, I just forgot I left the hose on until the neighbour knocked on my door telling me his patio was flooding and he thinks my pond is leaking...oops another way of heatinganother way of heating.

    So the results (drum roll please)

    Pond not covered and filtration not insulated

    Turn over rate through filters at roughly once every 2 hours through mid level returns and aeration on

    2 hour water change

    Assuming a rate of about 34 lpm that equates to roughly 4k litres

    Outdoor air temp roughly 5 degrees

    Next to no wind

    Temp before water change 4.1 degrees

    Temp after water change 4.9 degrees

    So a gain of 0.8 degrees over a 2 hour water change


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  13. #10
    Extreme Koi Member Rank = Mature Champion pip895's Avatar
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    Ouch - are the fish OK? ST crystals to hand?
    6000g in ground koi pond
    +3000g lily/Anoxic pond attached
    29 koi (40 to 65cm)
    Bottom drain, Mid water & Skimmer to Drum
    JBR boichamber->Blue eco 500 pump ->below surface return.
    Blue Eco 240 -> Large MB -> Waterfall -> Planted Anoxic pond (25 baskets)

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  15. #11
    Senior Member Rank = Nanasai Skoosh88's Avatar
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    Quote Originally Posted by pip895 View Post
    Ouch - are the fish OK? ST crystals to hand?
    Fish are swimming around fine, yes plenty of ST crystals used lol another way of heating


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