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  1. #1

    Temperature increases

    Question for all,

    I will be raising the temp from 12 c to eventually 24 c, at what rate per day in degrees c would you advise increasing, I can raise in 0.5c increments if needed, I will start to increase and leave the covers on short term, my ASHP is 9.5kw (thermotec inverter ) 3500 gallons, all walls fully insulated,

    what's your views pls ?

    Steve.

    Sent from my SM-A326BR using Tapatalk



  2. #2
    Senior Member Rank = Adult Champion Twhitenosugar's Avatar
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    The fish can usually handle a couple of degrees change in temp (as far as I can tell at least) in a short space of time. So I think the question is more about how much you are willing to spend on heating and how long you want the main growing season extended out by.

    If I had an ASHP on my pond, I would personally hold the pond around 13c for now and then gradually start ramping up the temp to 20c + in late April early may.

    My rationale for that is 13c is good enough health wise (avoids aeromenas alley), plus it won't require much energy to maintain. Also we probably will get more cold weather before then, plus it can still be pretty chilly at night at this time of year even when it's mild during the day. So I'd wait until the ambient temps are higher (better COP) and more stable to make the heating costs more palatable.

    But it's horses for courses and up to you and how much you want to pay

    Sent from my Pixel 4a (5G) using Tapatalk
    13,000L fibreglassed raised pond with window

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  4. #3
    Quote Originally Posted by Twhitenosugar View Post
    The fish can usually handle a couple of degrees change in temp (as far as I can tell at least) in a short space of time. So I think the question is more about how much you are willing to spend on heating and how long you want the main growing season extended out by.

    If I had an ASHP on my pond, I would personally hold the pond around 13c for now and then gradually start ramping up the temp to 20c + in late April early may.

    My rationale for that is 13c is good enough health wise (avoids aeromenas alley), plus it won't require much energy to maintain. Also we probably will get more cold weather before then, plus it can still be pretty chilly at night at this time of year even when it's mild during the day. So I'd wait until the ambient temps are higher (better COP) and more stable to make the heating costs more palatable.

    But it's horses for courses and up to you and how much you want to pay

    Sent from my Pixel 4a (5G) using Tapatalk
    Thanks ,I understand that the fish are less affected by an increase in temperature than a decrease, I think I'll probably wait for 2 or 3 weeks, weather is all over the place at the moment ,
    The ASHP is very economical, 120 days has cost £ 99.40 (34p/kwh cost) up to now at constant 12 degrees c, probably 4x that if heated with electric heater.
    Will post further when I decide to start ramping.
    Steve.

    Sent from my SM-A326BR using Tapatalk

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  6. #4
    Senior Member Rank = Sansai EME101's Avatar
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    Im not in the UK and temperatures are already a lot warmer and have been above 14.5 for about a month.

    I don't use heating but watching the natural temp fluctuations of + or - 1.5 degrees a day with up to 3 degrees over any week Im surprised how markedly different feeding behaviours are. Hottest I've had in last week is 19.8 , lowest 16.5 ( very cold nights , hot days). It is making me very wary of "too much food , too soon and my feeding regime is being governed by 'lowest temperature in last week".

    No idea if that is scientific or pertinent but does seem to have stopped unprocessed food food and fish still seem healthy.

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  8. #5
    Senior Member Rank = Mature Champion smartin's Avatar
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    Quote Originally Posted by EME101 View Post
    Im not in the UK and temperatures are already a lot warmer and have been above 14.5 for about a month.

    I don't use heating but watching the natural temp fluctuations of + or - 1.5 degrees a day with up to 3 degrees over any week Im surprised how markedly different feeding behaviours are. Hottest I've had in last week is 19.8 , lowest 16.5 ( very cold nights , hot days). It is making me very wary of "too much food , too soon and my feeding regime is being governed by 'lowest temperature in last week".

    No idea if that is scientific or pertinent but does seem to have stopped unprocessed food food and fish still seem healthy.
    Lucky you EME101 were a long way behind your average temp currently, at least you can feed with confidence now and the fish have their immunity.....
    2200 gallons,infinity window,
    Evolve 4k combi,spindrifter,
    2x20k pumps, BD,Skimmer,
    Shower, ASHP

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