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I have an immersion heater but it's operated by gas, so yes, you're right. Heating and Hot water are by gas. I've spent very little in electricity.

Thank you for your reply. I've check many things, but definitely only two fuses are in use now, interestingly. It's a small flat, and there are no big unit consuming a high level of electricity. I think that's why.

Ah, because of its cost Haha.. you can definitely say that black big fat cable is for a heavy load device, but there is totally no such a big appliance. I think it was used in the past, may be for electronic oven which is not in use and disconnected. Basically I don't use big units. Anyway, very...

I also wonder it. Red line might be for electric oven which is not in use now, and it's disconnected. Fairly old flat, and newly moved into her, so it's confusing so far. Thank you!

Yeah... it's the best option... but hm.. Thank you very much!

Sure ^^;; Thank you for your help.

Only 2 fuseways are in use. But I don't know why there are no available neutral screws. I consider to check 'dead' line and replace it. A new CU is the best, I also consider it... Thank you very much!

Electrician said he can manage this. I'll ask him how to deal with this and post it. Thank you all!

I live in 2nd zone London. Electricians said installing electric shower will cost around 300. So I assume that changing CU + installing Shower will cost around 500 ^^; is it wrong?

Thank you for your suggestion. Actually I do consider to replace my CU, but its cost is not very light. It will be around 500 or more. One can say it's worth doing it, but... somewhat heavy for me. I also consider 7.5kW shower.. it needs 32A MCB. Then, is it possible for me? Thank you again!

Thank you for your comment. So your suggestion is to change consumer unit? But my flat is fairly small one, so I think it's enough for me... it's bit confusing. Thank you anyway!

Oh, really? then, why electricians said they can install even 9.5kW shower??? I explained my situation to them clearly... .. I only use range cooker, not oven or hood (Does range cooker need 45A circuit?). And Really thank you for your comment!!

It's not a simple DIY job. Sure! I should hire an electrician. Now I'm contacting, but electricians don't explain very clearly. And they said it'll cost around 300. Is it good??

They can notify work that THEY have done - not anything which you or some other persons have done. If you want to do this yourself, you must notify building control before any work is started. There will also be a fee to pay. I think it'd be better not to do this myself. But I want to know...

I think electrician will notify this. But why I can't connect RCD? Anyway, thank you very much!

Thank you for your help. Protected bonding is also in place. But changing a consumer unit is, for me, too heavy. I just need shower.. and there are no other electrical gadgets which require huge electricity in my flat. Thanks again!

I will ^^ Thank you for your suggestion.

All Very Thank you. My electrician will help me, I believe. Thanks again!

Thank you for your advice. But I prefer taking a shower.. T.T.. Anyway, thanks again!