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Thread: The Daily pond temp thread
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31-12-2020, 02:28 PM #8741
ASHP definitely have a role to play - ideal for swimming pools when ambient temp during swimming season usually double figures. I can also see the attraction for ponds, but they will always struggle with icing and cutting out to defrost when it's very cold AND damp.
As far as I know the COP specifications are quoted in "ideal" conditions with dry air and no icing up occurring. A bit like official car MPG figures
Plenty of ASHP sales people and government green lobbyists will tell you that you should get rid of your gas boiler and heat your entire home with ASHP instead.
Would like to see the size/cost of an ASHP that could pump out 30kW in these conditions with a COP of at least 4 (to equal cost of gas/kWhr) without defrost down time.
Anyway, back to pond temperatures.
I made the decision (based on Manky Sankey's web info) to choose the option to only heat sufficiently to prevent temperatures falling below 4C.
To this end my pond is not insulated as this would have been counter productive (below ground temp is above 4C all year round - unless you are in the Arctic).
The pond is fully in ground and never covered.
My 2400W bank of "drop in heaters" in the filter outlet chamber are set to come on at 5C, but despite air temperatures being much lower than this for days the water temp is hovering at about 5.5C so they haven't been needed.
I guess the temp is being held by "heat" from surrounding ground.
Fish are mostly "resting" at 5.5C, but not clamped.
Will happily take wheatgerm at 7C and above.Last edited by Ukzero; 31-12-2020 at 02:34 PM.
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31-12-2020, 11:32 PM #8742Jim how often is your auto defrost kicking in? Mines heating fine but constantly freezing up and defrosting in these conditions.
The ice compaction on the element wasn't just preventing heat exchange - the air couldn't even circulate so the auto defrost had no chance. The published specs for the machine claim it will extract heat down to -15 but the damp / snow blockage seems to be the killer.
Back up to 14.2 now though so all good.
JimI don't keep fish, I keep water. I don't keep fish, I keep water. I don't keep fish I kee........
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01-01-2021, 02:55 PM #8743
Hi All,
the new pond thermometers arrived yesterday so i put one in today to countercheck the temperature against the old thermometer, after an hour to acclimatise the old thermometer read 14.2c and the new one shows at 13.4c so there is a difference of .8c between the two....... so pond temp somewhere between the 2 so with a week of very cold weather and hard night time frosts i am happy with the pond temp, it has dropped a full 2 degree's over the past week or so.... 300w heater on 24/7.2200 gallons,infinity window,
Evolve 4k combi,spindrifter,
2x20k pumps, BD,Skimmer,
Shower, ASHP
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01-01-2021, 04:38 PM #8744
Below zero air temp again last night, rose a little today to 4.5c ... Pond Temp still chilly at 2.8c
Forecast doesn't show much change for the next week so think all will remain on the chilly side.
Fish are slow but seem happy enough yet.
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01-01-2021, 07:06 PM #8745
My temp controller also reads different to the thermometer, about 0.2C lower. Would assume the temp controller is the more accurate being electronic but who knows.
You are still doing well with temps that high running the little 300w heater.
My 600w now set at 13C with 0.2C variance. Checked twice today and both times water was at 12.8C with heater constantly on.
If it hasn't got above 12.8C by Monday I'll lower heater to that temp. (Working all weekend so won't be able to properly monitor until then).
Gave one feed and koi were slower to eat it all today, took about 8 mins Vs the usual 4 or 5 mins.
Sent from my Pixel 4a using Tapatalk
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01-01-2021, 10:31 PM #8746
Smartin
I have posted elsewhere on this forum, ref thermometers both electronic & tubes, As an engineer who spent many years on test equipments, within the Aerospace industry.
I was always proving that stand alone units, that you cannot Calibrate, prior to collecting Data, would regularly have variations of 1° to 2° c. Some even worse?
Even if it was showing whole degrees & decimal places i.e. -: 7.4° could easily be out by the above limits either plus or minus, so 5.4° or 9.4° ?
If you purchase a Calibratable unit, you can be sure, after each re-Cal!
But all electronics drift, so don't believe the decimal place, unless you have several thermo, units that can confirm your readings.
Cost is the reliability factor, so if you have two or three units, take the readings then "Average them" & you should be close?
Stay Lucky in 2021!
Sent from my iPad using Tapatalk
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02-01-2021, 12:44 AM #87472200 gallons,infinity window,
Evolve 4k combi,spindrifter,
2x20k pumps, BD,Skimmer,
Shower, ASHP
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02-01-2021, 12:50 AM #87482200 gallons,infinity window,
Evolve 4k combi,spindrifter,
2x20k pumps, BD,Skimmer,
Shower, ASHP
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02-01-2021, 01:28 PM #8749
Thermometer accuracy is always going to be in doubt to some extent I suppose, but it does give at least an idea of what is going on re temp swings etc. The one I use for my air temp / pond temp measurements pretty closely matches the indoor / outdoor temperature monitor we have in the house.
How accurate the measurements are I don't truly know, but believe they are good enough for a ballpark figure to get an overview of what is going on.
Anyhow, another cold sub zero night, 12:00 Air temp reading 0.9c and still a layer of frost on outside tables etc... Pond temp reading 2.3c Accuracy aside what I do know is its chilly
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02-01-2021, 09:19 PM #8750
Hey all hope everyone is well and had a fantastic Christmas and new year!!!!
Location dartford
Outside temp 5c
Time one clock afternoon
Pond temp 7c
The outside temp yesterday and the day before I don’t know but was absolutely cutting! The coldest iv felt in years. I think the pond being covered and the filter house being insulated has just kept it at bay for the few really cold days! I’m happy with 7c just pray the temp continues to rise even is it’s by 1 or 2c!
All the best guys that warmer weather is only about 5 months away now
Sent from my iPhone using Tapatalk
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03-01-2021, 11:49 AM #8751
7C is pretty good going considering how cold it has been. I was out all day yesterday with 3 layers on and was shivering with ice cold hands and it wasn't even windy.
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03-01-2021, 12:32 PM #8752
11:00 Air temp 2.8c ... Pond Temp same as yesterday at 2.3c
No signs of improvement to come in the next week according to Met office so will be interesting see if pond gets much colder yet.
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03-01-2021, 12:33 PM #8753
Pond temp sat at 10c for a long time probably around 6 weeks maybe more. But this cold spell has done the damage knocking it down. I’m not feeding at anything below 10 so they have missed a few days food bless them. Strangely I an ochiba that through winter seems to grow past all the other fish! He done it last year and done the same again ! I can’t be imagining it lol
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04-01-2021, 12:58 AM #8754
Covers on every night and lifted in morning, neighbour must think I am mad , snow / ice / rain never fail
Stopped feeding now, fish very lethargic, minimal movement even as covers lifted.
Pond temp currently 4.6C, winter has set in now
Stay safe and heres to a better 2021 everyone1000 gal
2 x Hozelock 6000ltr 9W UV
Allpond Spin Filter 8000 11W UV
Blagdon pond oxy 640 ltr/hr
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arceye Thanked / Liked this Post
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04-01-2021, 04:08 PM #8755
Dry and chilly today, but no snow expected this week!
Pond now at 10.2°c with heater coming on and off occasionally. Still feeding small amounts of wheatgerm once, sometimes twice a day. Koi still relatively active and up looking for food!
Sent from my iPhone using Tapatalk1630 Gallon raised pond
4" 'Avenue' bottom drain
Estro sieve
Econobead EB60 bead filter
Sequence 18000 pump, 6000 pump on skimmer line
Elecro 2kW in-line heater
Evolution Aqua 70 air pump
Standard wall skimmer
Hozelock Vorton 55watt UV
and some nice koi
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arceye Thanked / Liked this Post
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04-01-2021, 04:43 PM #8756
Froze hard again last night,
10:00 Air Temp 2.3c .. Pond Down a bit further to 2c ..
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04-01-2021, 07:03 PM #8757
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04-01-2021, 07:13 PM #8758
Last edited by arceye; 04-01-2021 at 07:25 PM.
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04-01-2021, 07:58 PM #8759
You can really start losing fish at them temps bud.Can you buy a cheap heater and get it to 5 or at least cover
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arceye Thanked / Liked this Post
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04-01-2021, 08:49 PM #8760
Will look at heaters.. have turned my pump right down for tonight, think I'm chilling through lack of insulation on filter and having an open return. Was tempted to turn filter off overnight like we used to years ago in winter but I know it isn't recommended these days.
I've also resorted to pouring hot water into the return every half hour this evening, thats temporarily brought it up to 2.6 now.. better than nothing at all but not a solution I know.
Covering probably isn't an option at the moment, its barely got above freezing for the last week and it is taking its toll, anyway, off to look at cheap heaters.
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Wain Thanked / Liked this Post
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The Daily pond temp thread
Still at around 17C, know what you mean about getting the covers off though :D it will be really...