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  1. #1

    Profi 3 kw heater

    Anyone got the electrical fitting instructions for this heater, I currently have a radial feed in armoured cable with a 16 amp Rcb with a 63 amp RCD with a 63 amp RCCB sticker on the cover I can make use of this ?
    Iím assuming this gets hard wired ?
    And advise of a safety cut out switch

    Is this unit weatherproof ?


    Last edited by Dagenhamsteve; 13-01-2021 at 06:19 PM. Reason: Adding more

  2. #2
    A 16A RCD is fine for a 3kW heater if it is a dedicated circuit.
    If the RCD circuit in question also supplies other devices then you may need to look at the supply cable to see if you can safely add a separate circuit for those.

    When commenting on electrical installations I feel duty bound to mention that hard wired circuits as part of your domestic electricity installation should really be worked on or inspected and certified by someone qualified to do so.
    In many cases nobody would ever know, but in those few occasions where fire occurs your insurance could be invalid if you don't have the correct paperwork.
    Not to mention possible injury or worse.

    In my case I have done all my own electrical work and have then paid for it to be subsequently inspected and certificated.
    I'm sorry if this sounds a bit doom and gloom, but but better safe than sorry

    One advantage of plug in heaters/stats is that they are classed as appliances and so can legitimately be installed by anyone
    My DIY ponds from 1988 until present day.
    All can be found here:
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  4. #3
    Senior Member Rank = Jussai Mikeh83's Avatar
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    My 3kw heater runs on a 13amp plug.


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  5. #4
    Senior Member Rank = Jussai Mikeh83's Avatar
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    I have done a quick google for you and found this manual that may be of help

    https://www.nikoi.nl/upload/Handleid...d%20Heater.pdf

    When I was looking for it I found numerous images of them with a plug, and the manual mentions unplugging it.

    I also read treads suggesting it was weather resistant. It should have an IP rating on the device?


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  7. #5
    3000W at 240V is about 12.5A
    Allowing for small voltage and resistance variations that is obviously less than 13A, but is close.
    With such a small overhead I would strongly advise regular checking of all contacts (especially if you need to attach your own plug) as any poor contact could easily get very hot if run for any length of time.
    My DIY ponds from 1988 until present day.
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  8. #6
    Senior Member Rank = Jussai Mikeh83's Avatar
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    Profi 3 kw heater

    I donít disagree with your advise but this is why 3kw heaters are commonly used as they are simple plug and play. My 3kw heater runs through an energy monitor so I know the maximum it has pulled since running and it has peaked at 2871w


    It seems to run at 11amps, 215v, 50hz


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  9. #7
    Spoke to a friend and he said that the 4mm feed is fine, it arrives today , think Iíll hard wire it
    Thanks for the help
    Anyone point me in the direction of a overheat stat in case of a fault

  10. #8
    The UK supply Voltage does vary through the day and 215V is at the extreme bottom limit of what is specified (cable lengths/gauges, meter accuracy and loading can all affect a local reading however).
    I have never measured a mains voltage that low where I live. It might be worth checking with a decent multimeter to determine how accurate your plug in monitor is for measuring voltage and seeing how much it changes under load.

    Based on your figures and calculating the heater resistance it looks as though even at 253V (UK upper limit) the current would be about 12.9A (more voltage means more current), so still below 13A.
    By the way, running at 253V the power output or your heater (based on your info) would be approximately 3.2 kW, but I doubt you'll ever get 253V so that's kind of theoretical.

    If 3kW (nominal) heaters are sold with 13A plugs fitted I totally agree that they will be safe to use.
    Plug in heaters are also much easier to set up with monitors such as above.
    I still think it useful to point out that they are running at the top end of the plug's range and that very good tight connections are important throughout to ensure "optimal operation and safety" .


    I'm sure most of us have seen a burnt plug due to poor connections at some time.
    My DIY ponds from 1988 until present day.
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  12. #9
    Quote Originally Posted by Dagenhamsteve View Post
    Spoke to a friend and he said that the 4mm feed is fine, it arrives today , think I’ll hard wire it
    Thanks for the help
    Anyone point me in the direction of a overheat stat in case of a fault
    It depends how weather proof you need it to be.
    I am assuming this is to prevent overheating in case of pump failure or blockage?

    For outside use you might be better off using an STC 1000 type stat. You can clamp the weather proof sensor to the heater and put the stat in the dry somewhere.
    Last edited by Ukzero; 14-01-2021 at 01:35 PM.
    My DIY ponds from 1988 until present day.
    All can be found here:
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  13. #10
    To answer the question " Is it weatherproof?"

    In the absence of a direct statement by the manufacturer in the manual, if cable entry to the heater is made using a waterproof gland then the unit can be regarded as splash proof i.e. it won't go up in a shower of sparks and smoke if you accidentally splash it. However, I wouldn't say it would be safe to regard it as long term rainproof.

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  15. #11
    Senior Member Rank = Jussai Mikeh83's Avatar
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    Profi 3 kw heater

    I agree. The unit itself should have an ip rating on it.

    Based on the images I have seen on the internet of the profi style heater they are ip54



    Check the item itself.

    I would always where possible protect from the elements as itís not just the wet that can cause issues, uv / frost can degrade items.


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  17. #12
    I assume it will come without a flex like the electro heater I used to use some time back
    This will take away responsibility
    Although itís tough finding adequate sized flex
    Excuse my logic as I work in gas
    But wouldnít a 3 kw heater with say a 2.5 flex be unable to supply the heater with enough amps to work at capacity , but still work without overheating the supply

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  19. #13
    Thanks for the help with weather proofing itíll be in the filter house but low down and will get the odd bit of water near it

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  21. #14
    Senior Member Rank = Jussai Mikeh83's Avatar
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    When I was looking Iím sure they said it came with 3 meters of cable?

    Where did you buy it from?

    Why did you chose this over an electro?


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  23. #15
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    I tested some standard 13a plug fuses and none blew below 18 amps.

    One of them didn't blow until over 23 amps was applied.

    So even 3.5kw and a sudden voltage drop to 200 volts wouldn't have blown any of those fuses.

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  25. #16
    I Purchased it on Amazon, it has a damaged box so for half the retail price I thought , thatíll do me
    If it comes with a flex Iíll hard wire it and add a 13 amp fuse ,
    Iím sure that will suffice , just need to find a suitable overheat stat
    I only have experience with the ones that plug into heat exchangers
    Donít know if I need one that submerged in the filter or onto or close to the heater

  26. #17
    Also the safety stat would need to accept 4/6 mm flex Iím guessing , Iíll have match the flex supplied on the heater

  27. #18
    Senior Member Rank = Jussai Mikeh83's Avatar
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    Cannot help with the stat unfortunately.


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  28. #19
    Just read your stat link 👍🏻
    Apparently the inbuilt stat is a bit inaccurate , I can live with that lol
    I have a thermometer
    Just wanted a fail safe and I donít fancy cooking the buggers , thought everyone had them😂

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  30. #20
    Senior Member Rank = Jussai Mikeh83's Avatar
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    Profi 3 kw heater

    Yeah I bypassed my stat on my electro 3kw heater as it was not accurate also... took to long to register the temp variances meaning I could have 4c differential with my external stat itís extremely accurate and I allow a .2 difference. It saved me money also as the old stat used to go beyond the temp I set.

    Good thing with the electro heaters is they have a flow switch and over heat switch inbuilt.


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