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Is it possible to have two electric showers in the same property?

Old victorian house, with rewired electrics (approx 8-10 years ago). Has one main 16th edition consumer unit plus a secondary unit with spare ways, all with MCB's. Main box does NOT have an RCD, secondary box does have an RCD used as the main switch for that box.
Existing shower is 8.5Kw but the largest mcb rating is 15amp!!
Proposed 2nd shower is 9.5Kw in a different part of the house to serve a disabled person.

5 Answers from MyBuilder Electricians

Best Answer


To answer your question in 2 parts;

1. Existing 8.5 kw shower. If I understand you correctly you say it is wired on a 15 amp mcb. I am wondering if this is a rewireable fuse, if so it may be wired differently than it says on the rating. At maximium power a 8.5kw shower would pull just under 37 amps. It was a standard 15 amp mcb it should trip unless there is a fault with either the breaker or the shower. It is also possible that it might be a cartridge fuse and the rating of the actual fuse might be higher than the casing suggests.

2. New 9.5 kw shower. Needs to be run in 10mm T&E cable and must be RCD protected. The installation will also need to be tested and certified by a competent electrician.

Hope that helps.

NJM Electrical


Answered 4th Aug 2011

Yes but as you are aware you will need 10mm cable and RCD's on the circuit.
Best post as a job and get some quotes


Answered 4th Aug 2011

Please calculate the required cable size to ensure it is adequate with regard to voltage drop etc. 10mm cable is not always suitable!!


Answered 8th Aug 2011

Hi yes it possible to have 2 showers,
With a 9.5kw shower you will need 10mm cable on a 40a rcbo or rcd.
Hope this helps.
SJN Electrical Ltd


Answered 4th Aug 2011

As long as the main fuse in the cut out is at least 80amps you should be fine. 100amps would be better. both circuits would require RCD protection and i would recommend replacing the consumer units for 17th edition as the current mcb's may be faulty as 8.5kw is more than 15amps


Answered 4th Aug 2011

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