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Thread: Profi 3 kw heater
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13-01-2021, 06:18 PM #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 ?
I’m 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
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14-01-2021, 10:29 AM #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
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john1 Thanked / Liked this Post
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14-01-2021, 11:13 AM #3
My 3kw heater runs on a 13amp plug.
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14-01-2021, 11:22 AM #4
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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Gazkoi Thanked / Liked this Post
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14-01-2021, 12:01 PM #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.
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14-01-2021, 12:16 PM #6
Profi 3 kw heater
I don’t 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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14-01-2021, 12:50 PM #7
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
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14-01-2021, 01:21 PM #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.
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14-01-2021, 01:31 PM #9
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.
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14-01-2021, 03:00 PM #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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14-01-2021, 03:11 PM #11
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 it’s not just the wet that can cause issues, uv / frost can degrade items.
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Manky Sanke, Gazkoi Thanked / Liked this Post
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14-01-2021, 03:20 PM #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 it’s tough finding adequate sized flex
Excuse my logic as I work in gas
But wouldn’t 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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Mikeh83 Thanked / Liked this Post
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14-01-2021, 03:22 PM #13
Thanks for the help with weather proofing it’ll be in the filter house but low down and will get the odd bit of water near it
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Mikeh83 Thanked / Liked this Post
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14-01-2021, 04:05 PM #14
When I was looking I’m 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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john1 Thanked / Liked this Post
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14-01-2021, 04:49 PM #15
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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john1 Thanked / Liked this Post
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14-01-2021, 05:52 PM #16
I Purchased it on Amazon, it has a damaged box so for half the retail price I thought , that’ll do me
If it comes with a flex I’ll hard wire it and add a 13 amp fuse ,
I’m sure that will suffice , just need to find a suitable overheat stat
I only have experience with the ones that plug into heat exchangers
Don’t know if I need one that submerged in the filter or onto or close to the heater
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14-01-2021, 06:01 PM #17
Also the safety stat would need to accept 4/6 mm flex I’m guessing , I’ll have match the flex supplied on the heater
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14-01-2021, 06:10 PM #18
Cannot help with the stat unfortunately.
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14-01-2021, 06:16 PM #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 don’t fancy cooking the buggers , thought everyone had them😂
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Ajm Thanked / Liked this Post
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14-01-2021, 06:58 PM #20
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 it’s 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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Ajm Thanked / Liked this Post
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