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  1. #1

    Rate of temperature increase when heating

    Hi ! I have just introduced a heater and want to bring the temperature from 7.6 to 10 degrees. What length period should i spread this increase this over?

    I have a 1600 gallon pond with a 3kw heater so i want to be careful not to heat too quickly. A test has show It climbs 0.4 degrees per hour which i understand is too fast?

    Thanks



  2. #2
    Extreme Koi Member Rank = Kyusai 1meterchag's Avatar
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    0.5 degrees a day will be ok.

    I would aim at keeping the pond at 12C.

    Alex

  3. #3
    Extreme Koi Member Rank = Mature Champion pip895's Avatar
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    Going up 2deg per day is fine. Slower on the way down though, ideally ~0.5. You may find your 0.4 deg/h slows significantly over night unless you are extremely well insulated.

    I would put the temperature up 1 deg each evening - what have you set the delta value to on your stat? The default is often set very high, 2 deg even, which would make your precautions a little redundant.
    Last edited by pip895; 18-01-2019 at 05:09 AM.
    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)

  4. #4
    I too have brought a 3kw heater and plan to do the same thing. What do you think the running cost will be like?

  5. #5
    Quote Originally Posted by pip895 View Post
    Going up 2deg per day is fine. Slower on the way down though, ideally ~0.5. You may find your 0.4 deg/h slows significantly over night unless you are extremely well insulated.

    I would put the temperature up 1 deg each evening - what have you set the delta value to on your stat? The default is often set very high, 2 deg even, which would make your precautions a little redundant.
    Thanks for the responses. Do you mind explaining what the delta value is? The pond heater I have only seems to have a simple thermostatic dial. I assume the delta value is the rate in which it allows the water temp to climb or drop?

    To try avoid climbing 1 degree in 2.5 hours, I am very slowly increasing the dial in steps to achieve small increases of under 0.5 degree at a time. If I do this twice per day, I should able to spread 1 degree increase out over 2 periods in the day instead of all in 2.5 hours. (or am I worrying too much?)

    In terms of power consumption, I have bought a smart plug which monitors power consumption. Increasing from 7.6 degrees to 8.4 consumed 8.6 kw hours amounting to about £1.20. This is for a covered 8000 litre pond when it was -1 degrees outside. I have no idea what its going to cost me to maintain 10 or 12 degrees but plan to monitor it closely using the smart plug.

    Does anybody use a smart thermometer which is accessible from the internet? I'm struggling to find one and would find it very useful to plot and track the temperature.

  6. #6
    Moderator Rank = Supreme Champion Feline's Avatar
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    I find koi cope extremely well with an increase in temperature. It's the rapid decreases they don't like. I would do it over a couple of days myself.

    I wouldn't think twice about putting a fish at 7C from a dealer in a 10C pond (although that would be a very unlikely scenario indeed!).

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  8. #7
    Quote Originally Posted by Feline View Post
    I find koi cope extremely well with an increase in temperature. It's the rapid decreases they don't like. I would do it over a couple of days myself.

    I wouldn't think twice about putting a fish at 7C from a dealer in a 10C pond (although that would be a very unlikely scenario indeed!).
    Thanks Feline, good to know.

  9. #8
    Extreme Koi Member Rank = Mature Champion pip895's Avatar
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    Quote Originally Posted by willshill View Post
    Do you mind explaining what the delta value is?


    Delta is the difference in temperature where it stops heating and the temperature it starts heating again. Both the electronic thermostats I have, have it set by default to 2 degrees. So by default if I have a set temperature of 8deg C the heater will turn off when the temperature reaches 8 but wont turn on again until 6. I have re set this on mine to 0.5deg - the minimum on both my stats is 0.3deg. With an electric heater I would probably have it set to the minimum of 0.3 deg.
    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)

  10. #9
    Quote Originally Posted by pip895 View Post


    Delta is the difference in temperature where it stops heating and the temperature it starts heating again. Both the electronic thermostats I have, have it set by default to 2 degrees. So by default if I have a set temperature of 8deg C the heater will turn off when the temperature reaches 8 but wont turn on again until 6. I have re set this on mine to 0.5deg - the minimum on both my stats is 0.3deg. With an electric heater I would probably have it set to the minimum of 0.3 deg.
    This delta is often referred to also as Hysteresis of a thermostat in owners manual or literature and indeed most often it is preset at 2dC - considered comfortable compromise in central heating systems between cost / frequency of on - off switching and user's comfort feeling. For sure too big swing in Koi pond - more dangerous with powerful heating system as the upper limit might be reached too fast.....
    You get what you pay for - or better - what you make yourself.

  11. #10
    Extreme Koi Member Rank = Kyusai TinyTony's Avatar
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    Quote Originally Posted by Pondkeeper89 View Post
    I too have brought a 3kw heater and plan to do the same thing. What do you think the running cost will be like?
    ive ran a 3kw for 10 yrs costs all depends on how well ur insulated and covered . last yr crippled me as did 2006 but im at 16.5 now and its around 25 ish aweek

  12. #11
    Quote Originally Posted by pip895 View Post


    Delta is the difference in temperature where it stops heating and the temperature it starts heating again. Both the electronic thermostats I have, have it set by default to 2 degrees. So by default if I have a set temperature of 8deg C the heater will turn off when the temperature reaches 8 but wont turn on again until 6. I have re set this on mine to 0.5deg - the minimum on both my stats is 0.3deg. With an electric heater I would probably have it set to the minimum of 0.3 deg.

    is this adjustable on a heat pump, if I set my water temp to say 12 c, it will heat to 13c then turn off till the water drops too 11c, and then repeat, which Is kind of pants really.!

    I dont actually let it do that, I let it drop 1 degree then I turn it on again by increasing the temp on the thermostat.

    Thanks
    David

  13. #12
    Thanks for the responses. I installed a 3kw heater and slowly brought the temp up to 12C where it stayed almost bang on for 5 or 6 days. Everything was going well until last night where I noticed the temp slowly dropping. I turned the thermostat up slightly to engage the heater but after 5 minutes it was off again. Then overnight the pond has dropped 0.5 degree and the heater has tripped the RCD I have it plugged into. I will have to check it out later but i'm fearing it has packed up for some reason.

    I've turned everything off until I can investigate later this evening. I figured turning the pump off will lower heat loss while its -1C outside.

  14. #13
    Extreme Koi Member Rank = Mature Champion pip895's Avatar
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    In general turning pumps off in frezzing conditions isnt recomended as it can cause pipes to freze and split.

    Water is most dence at 4deg so provided water is warmer than this it wont make much difference having the pumps on as the warmest water will be at the surface anyway.
    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)

  15. #14
    Extreme Koi Member Rank = Mature Champion pip895's Avatar
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    Quote Originally Posted by familyman View Post
    is this adjustable on a heat pump, if I set my water temp to say 12 c, it will heat to 13c then turn off till the water drops too 11c, and then repeat, which Is kind of pants really.!

    I dont actually let it do that, I let it drop 1 degree then I turn it on again by increasing the temp on the thermostat.

    Thanks
    David
    I have my heat pump on a separate thermostat which can control the temp to Delta of 0.3deg C. Even the dream will allow you to set it to 1deg. I am fairly sure the Duratech allows it to be set at 0.5 deg.
    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)

  16. #15
    ive looked intensively through my instruction booklet but there is nothingthat even mentions altering the hysteresis.
    Does anybody else with a duratech know?

  17. #16
    Hi again! As mentioned by other members in this post, it appears my heater has a delta of about 0.5. Is this an issue? The temp is bouncing between 11.7 and 12.2 C. Every day!

  18. #17
    Extreme Koi Member Rank = Kyusai TinyTony's Avatar
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    is it an elecro inline heater ? if so then no its not an issue ,once the set temp is reached it will switch off until the temo drops 0.5 degs b4 kicking in again

  19. #18
    Junior Member Rank = Fry bis's Avatar
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    .5 delta is good. My Crystal Heat Pump has a delta of 2 degree and I am told not to redece this setting. Hope this 2 degrees is okay with my fish. Does any body using Cystal Heat pump and have changed the delta setting.

  20. #19
    Extreme Koi Member Rank = Mature Champion pip895's Avatar
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    My heat pump is working with a delta of 0.5. I can't really see why you would need to have a higher one. If you had a very small but poorly insulated pond I suppose you might get frequent turning on and off which could be a problem but for me it takes the pump hours to move 0.5 deg so it isn't an issue. I would turn it down personally, perhaps go for 1deg , 2 degrees seems too big a swing to be desirable.
    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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