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  1. #321
    Quote Originally Posted by youmustcomply View Post
    I just have enough room to get the ball valves on the outside. But there is physically not enough room to have a ball valve as the bypass. I will need to use a slide valve. I am
    Also 1 elbow short. Sigh. Inside is abit of a pipe work cluster fu….




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    Plumbing my ASHP was by far the most complicated bit in the whole koi pond pipework mash up for me. Controversially, I opted not to use a bypass, and just put a BV on the line feeding the shower from the T off the pump (other fork of the T feeds the ASHP). To regulate flow I just let more or less water go to the shower, which forces more or less water through the heat pump. If I need to remove the heat pump for any reason, I'll just close the BD valves and lose a bit of water. Means I can also bypass the shower altogether if I need to (and is generally recommended in winter due to the chilling effect). Next year I'll redo my plumbing 'properly' as I revisit my filter house, but it works for now

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  3. #322
    Senior Member Rank = Mature Champion dbs's Avatar
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    That looks a tight squeeze for sure inside, I have to agree the ASHP was a bit of an arse for me too, it runs great now but not sure how it will be in the winter, a tad more insulating of external pipes to do yet and likely a drop on insulated cover for the ball valves.

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  5. #323

    Couldn’t think Of anything better to do on Friday night to be honest!


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  7. #324

    About to do a water test! New House, New Pond.


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  9. #325
    No leaks! Hooray! Will soak test over night and then turn the heat pump on tomorrow. No point trying to heat initially over night.


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  11. #326
    So heat pump is now up and operational. Holding 20 degrees with ease. It’s pretty quiet too.


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  13. #327
    Senior Member Rank = Mature Champion dbs's Avatar
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    Thats great to hear, nice one !!

    What temperature are you thinking of doing long term ??

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  15. #328
    Well, I haven’t decided. But probably just extend the summer abit and then bring temp down and give them a mini winter mid jan I think for 4 weeks. Then back up.

    Ponds at 19 this morning, not sure why it hasn’t maintained at 20. It’s set to 20. I might need to check the threshold.


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  17. #329
    Moderator Rank = Supreme Champion Feline's Avatar
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    Heat pumps usually have a 1C hysteresis. So if you don’t want it to fall below 20C set the stat to 21C basically.

    Some people worry about this big a fluctuation, but it’s way less than the koi would experience in most unheated ponds with warm days and cool nights so I personally wouldn’t worry about it.

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  19. #330
    Senior Member Rank = Mature Champion dbs's Avatar
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    Quote Originally Posted by youmustcomply View Post
    Well, I haven’t decided. But probably just extend the summer abit and then bring temp down and give them a mini winter mid jan I think for 4 weeks. Then back up.

    Ponds at 19 this morning, not sure why it hasn’t maintained at 20. It’s set to 20. I might need to check the threshold.


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    Sounds like a good plan, I hear many saying about a mini winter for them, this will be my first year having this option, is this down to about 14c for you ??

  20. #331
    This is quite an interesting read. So may follow this:

    https://www.koicarp.org.uk/koi_dry_goods_heating.htm

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  22. #332
    Quote Originally Posted by Feline View Post
    Heat pumps usually have a 1C hysteresis. So if you don’t want it to fall below 20C set the stat to 21C basically.

    Some people worry about this big a fluctuation, but it’s way less than the koi would experience in most unheated ponds with warm days and cool nights so I personally wouldn’t worry about it.
    Thanks Feline. It appears that the temp of the water drops to about 19 before the heat pump kicks in again when set to 20. I think I will leave it as that. The fish seem hungry enough!

    I now need to think about poly carb covers...

  23. #333
    Senior Member Rank = Mature Champion dbs's Avatar
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    Quote Originally Posted by youmustcomply View Post
    This is quite an interesting read. So may follow this:

    https://www.koicarp.org.uk/koi_dry_goods_heating.htm
    Had a quick read, sounds good too, thanks !!

  24. #334
    Quote Originally Posted by dbs View Post
    Had a quick read, sounds good too, thanks !!
    So they are saying allow the water to drop to 4 - 5 degrees between the 2nd week in Jan and whole of Feb. Will give it a shot. Tweak as needed.

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  26. #335
    Senior Member Rank = Mature Champion dbs's Avatar
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    Quote Originally Posted by youmustcomply View Post
    So they are saying allow the water to drop to 4 - 5 degrees between the 2nd week in Jan and whole of Feb. Will give it a shot. Tweak as needed.
    I will be tempted to only have them in the cold for a month rather than losing 2 months, so will keep researching to get other opinions too

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  28. #336
    Quote Originally Posted by dbs View Post
    I will be tempted to only have them in the cold for a month rather than losing 2 months, so will keep researching to get other opinions too
    Yeah I kind of agree. Will see what kind of winter we get first i think.

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  30. #337
    This from Manky Sanke (Syd) is a brilliant primer on heating. Apologies if this has already been posted elsewhere.

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  32. #338
    Quote Originally Posted by perniciousviper View Post
    This from Manky Sanke (Syd) is a brilliant primer on heating. Apologies if this has already been posted elsewhere.
    Not sure why I hadn't thought about looking at Manky's site. Cheers for this.

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  34. #339



    Bowl up and measure up today of all fish.
    Glass clean and a bit of a clean of the drum. Amazing how much gunk stays in the waste shoot.

    Loving the scales on my black Chag, 7cm of growth since May. All fish have put on between 3cm and 10.


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  36. #340


    Also this small chag has put on 7cm and looking really nice.

    Dam I need to love some fish on. Will likely wait to next year now.

    Pond is currently at 19.5 and ordered poly carb for delivery for Friday.


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