Re-siting Dimplex Storage heater

Hi,
Floorboards up for some light re-wiring.
I was toying with the idea of moving a night storage heater. Dimplex.
2 problems:
1. How do I find out what current the heater is. No markings on the outside except XT18 series G.
2. The heater is approximately 14 metres from the CU. Can I use 2.5mm T+E to wire it up?
Any help would be appreciated, I keep hitting brick walls...
TIA, Colin
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I have discovered that the heater is rated at 2.55kW.
Therefore, only thing stopping me is: is 2.5mm T+E OK for 14 metres?
Colin
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Yes, actually slightly OTT.
Handy cable calculator at: http://www.tlc-direct.co.uk/Technical/Charts/VoltageDrop.html
--
fred

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Thanks.
Is that right... I could run a 2.55kW heater on 1mm cable. Sounds a bit risky!
Colin
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Agreed, all the specs are based on acceptable volt drop and acceptable temperature rise in the cable/connectors. If you've ever run 13A through even a good 13A plug then you'll know that you don't really want to run it that close to the limits. Notice that 1mm2 was only suitable for cable in free air, safer with 1.5 or 2.5mm, but I notice Rich has doubts about your 2.5kW rating, was that from a rating plate, there should be one? 2.5mm sounds safer in case it is 3+kW, it's cheap.
Regards,
--
fred

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To find the rating plate you have to remove the front/top cover ( ONLY TO BE DONE WHEN THE HTR IS SWITCHED OFF AT THE MAIN WALL SWITCH, DO NOT TRUST THE FACT YOU ARE DOING IT DURING THE DAY AND THE E-7 IS OFF IT MIGHT SWITCH BACK ON )by undoing the 3 screws across the top back of the htr then pull the panel forward and lift the top panel up a bit the bottom front is hinged on the front part of the feet it then unhooks off the feet and gives access to the wiring connections the rating plate is either at the bottom left or the bottom right down by the feet. It is standard practice to use 2.5T+E as the supply cable to storage htr's with a 15Amp fuse protecting the circuit.
Rich

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A Dimplex XT18 has 3 850Watt elements in it and would be supplied by a dedicated circuit of 2.5 T+E cable with a Double Pole switch by the heater and protected at the fuse box by it's own 15Amp fuse ( generally a cartridge fuse ) Be very careful if moving it far with the bricks in it as these bashing around can damage the insulation inside and can then result in scorch marks on the outer panels as the heat can then escape through the damaged insulation!!!!!
Rich
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cartridge
marks
Thanks everyone for your answers...
A supplemental question... If I have 4 of these suckers wired through my CU (economy 7). What minimum size fuse should the CU have for them.
Cheers, Colin
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"Colin" wrote in message

Do you mean the fuse for each heater circuit, or feeding the whole off-peak CU?
For the former, 15 or 16 A per heater, as has already been said. If you mean the latter, then it needs to be at east enough to supply the total load of 4 times 2.55 kW, i.e. 10.2 kW which equates to 40-odd amps at 230/240 V - so you'd need at least a 45 A fuse. Normally though this function would be performed by the supplier's main fuse of 60 or 100 A (depending on the age of your installation) and the metering equipment would provide a switched supply to the CU.
Does that help?
PS: storage heaters are rated in terms of kWh of energy storage (per day). Yours are 18 kWh units - clear from the "18" in the model no. The normal range of sizes is 6, 12, 18 and 24 kWh. Divide the kWh figure by 7 (hours) to get the power rating in kW.
--
Andy



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Volts times Amps = Watts. So, Amps = Watts divided by Volts. So, to a perfectly good approximation, on British mains voltage, 240V in practice and we'll call it 250 just to make for round numbers, 1kw = 1000W draws 4A. Your heaters are 2.5kW each, aren't they? So each one pulls 10A. 3kW ones would pull 12A.
As others have said, it's almost universal practice to run separate 2.5mmsq cables to each heater, each one with a 15A fuse/MCB. In rare cases - two storage heaters close to each other but far from the CU - you might run a 4mmsq cable to supply both, fused at 30A.
HTH, Stefek
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OK...
Sounds fair enough.
This leadds me to my final question... If I run the new storage heater off a new fuse on the main CU, I can put a timer next to the heater to switch on/off at off-peak times. Supposing the heater ws accidentally or puposely left on 24 hours instead of just 7. Would that do it any harm?
Thanks, Colin
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Why do you want to run the htr off the normal supply?? if you did and the htr was accidentally switched on for more than 7 hrs I would think the charge controller i.e. the knob which determines how hot the htr gets would switch of the elements until it cooled enough for the control to switch back in if this was an on going situation you may find the cut-out operating so the htr would go cold. But at the end of the day it should be on the Off-peak fuse box also main house fuse should be a 100Amp in the sealed cut out of the boards property.
Rich

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