Hot Water Tank & Central Heating Therm- Cable Requiremen

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Hi All,

I need to purchase the cabling and make the runs ready for my electrician to wire in a new central heating thermostat and hot water tank thermostat + immersion heaters. Could anyone advise me on the what cable is usually used for such purposes?

I would imagine:
- Gas Central heating Thermostat - 3 core + earth 1.5mm (I presume there is not really that much current going through it.
- Hot Water Tank Thermostat to Central Heating - 3 core + earth 1.5mm
- 3kw @240v Electric Immersion Heater as backup for hot water tank - 2 core + earth 2.5mm

Are any of my assumptions incorrect here?

Thanks,

Jon
 
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Oh and I realise that I need heat resistant Flex from the wall switch to the immersion heater.
 
Mainly because I have already asked him a million questions and I am feeling a bit guilty as a result, but maybe this is a query deserving of another call...
 
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I would go further and wonder why 1.5mm² is even considered (it seems to have become fashionable (i.e. no valid reason)).

The maximum current carrying capacities:
1mm² - 16A
1.5mm² - 20A
2.5mm² - 27A

Demand:
Central heating - maximum half an Amp.
Immersion heater - 13A
 
I would go further and wonder why 1.5mm² is even considered (it seems to have become fashionable (i.e. no valid reason)).

The maximum current carrying capacities:
1mm² - 16A
1.5mm² - 20A
2.5mm² - 27A

Demand:
Central heating - maximum half an Amp.
Immersion heater - 13A

Point noted - I have bought loads of 1.5mm and 2.5mm ready for when my Sparky arrives on Monday. Not sure there is any point in buying additional 1mm when I am sure to have some left over.
 

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