DIY Doctor

New Hob Power Rating Help and Using Existing Wiring

Postby jonathan4321 » Tue Sep 18, 2018 6:06 pm

I’m looking for some guidance in choosing the right hob without having to alter the wiring that is currently in place. It is set up as follows
- b32 RCD
- 6mm wire to 45A DP (possibly passes through a double socket near the cooker)
- 2X 6mm wires come out of the DP
- one to the cooker (Lamona max output 2400w 10.43A)
- and the other to a hob (lamina 1215 max output 6500w 28.2A)
- I am looking at purchasing a purchasing a Hotpoint CIS641FB Hob. Max output 7200w 31.3A
- Can my electrician swap this out like for like or will new cable / parts need to be run to the RCD? or choose hob with lower power rating?

Thanks in advance
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Postby ericmark » Wed Sep 19, 2018 1:35 pm

It is up to your electrician some can be very pedantic, however with an induction hob you can't possibly use full power for long, basic fact is it's far more economical to old type, your cooking same food, so must use less power, even if for a short time it can use more.

So should be no problem on existing supply.

One word of warning however, touch controls are not required with induction hobs, they were with halogen to allow easy cleaning, but induction does not get as hot as halogen so food does not bake on, only heat on an induction hob comes from the pan.

So there are two major draw backs with touch controls, first is children or people in a wheel chair are too low of an angle to see controls, so both hard to use, and easy to in error do something as you can't see controls at their angle of view.

Second is they are slow to use, induction is as fast acting as gas, maybe faster, so when you see the milk starting to boil over, no need to touch pan, you simply turn it off, turn is the operative word, you can turn some thing off quick, but tapping touch controls is just too slow, by time you have touched them 6 times milk has boiled over.

There are exceptions, some do have a single off button for each area, and some knobs use same idea as a computer mouse, turning knob makes a lot of pulses which again means limit in speed.

But learn from my error, induction hob had to be ripped out again as mother in wheel chair could not see controls, and having being use to my Belling which had knobs, mothers induction was really slow to control in comparison.

You can get 4 area induction hobs which will work with 13A, however I would not really select one of those, but now at mothers I use a cheap Lidi portable induction unit on top of original halogen as halogen so slow, the induction is 2 kW and on switch on it defaults to 1 kW, and in the main we turn it down not up. So I would say 1.8 kW Halogen = 800W induction.
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Postby jonathan4321 » Wed Sep 19, 2018 5:27 pm

Thanks for the advice.
We chose the specific model because we get discount and has a few features we like which overcome some of the suggested issues you’ve posted.
Heat control is a touch sensitive slider. So no pressing up and down to get to the right temp. Just select hob and desired temp on the bar.
Has a lock, and automatic shutoff if it over boils.
Will see how we get on with it.
Luckily our pans work with it as well.
Thanks for the advice on the electrics, much appreciated.
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