Posting a message to the forum will remove the above advertisement

Discuss How Many 10kw Showers? in the Electrical Forum area at ElectrciansForums.co.uk.

Tags:
Please make sure you checkout our forum sponsors, many do discounts for members and, they keep the forum free to use.
  1. ED17
    Offline

    ED17 Regular EF Member

    Location:
    North West
    Last year we rewired a bungalow on a large private estate which caters for mentally ill patients. It had 5 bedrooms each with it's own wet room. The builder wanted a 10kw shower in each wet room but as the incoming sub - main was only 16swa protected by a 60amp fuse we told him no. We ended up with one electric shower and 4 mixers off the combi. The client needed a back up in case of boiler breakdown.

    There are six identical bungalows and now the next one is ready for refurbing. The builders had two other contractors in to price the rewires. One's told him that 3 x 10kw showers will be ok and this has made the builder happy.

    I've spoken to staff in the original bungalow who inform me that the normal morning routine is for two showers to be used at the same time usually while breakfast is being prepared (with electric oven and hob)

    I'm sticking to one shower so it looks like I'll not be getting this one.
     
  2. mhar
    Offline

    mhar Electrician's Arms

    Location:
    devon
    In my area it is usually concentric (sometimes split concentric) supplying the property, not swa. It is quite usual to have a 16mm feed with an 80A service fuse.
    It is usual for the supply to properties (certainly in my local area) to be an 80A supply so I would phone the DNO and ask if there is any reason for this smaller than usual supply and to see if it can be increased to 80A.
     
  3. ED17
    Offline

    ED17 Regular EF Member

    Location:
    North West
    It's from their own private distribution system not DNO.
     
  4. Leesparkykent
    Offline

    Leesparkykent You Rock Gmes Staff Member Trusted Advisor

    Location:
    Kent
    How well do you get on with the builder? I would call on a meeting and explain that you don't want to loose the job over some other dipsticks quote saying he can have 3 x 10KW showers. If he's a sensible guy then he will be able to see the maths doesn't add up if you put it in black and white in front of him. Due to the nature of the building It wouldn't be practical to use contractors/relays so if one shower was on the others couldn't be used. An unvented cylinder would be the ideal choice in this situation if the water pressure and flow rate is acceptable for the demand. you could use a direct cylinder or indirect cylinder. Indirect would be heated by a boiler for example and a direct cylinder would be heated by immersions. A 250 litre cylinder would feed 3 showers on the go at once for nearly 10 minutes. The reheat time for the entire cylinder would be around 2hours with two 3KW immersions so that would be a factor as to how frequent the 3showers were to be used.
     
    • Like Like x 7
  5. Wilko
    Offline

    Wilko Electrician's Arms

    Location:
    Berkshire
    Business Name:
    Wilko Electrics
    Ohm's Law hasn't changed overnight and a 10kW shower will still pull over 40A. How a competent designer thinks its ok to run 3 of them (and cookers!) off a 60A fuse does take tonight's biscuit. As Lee has said, hopefully the builder will get it. I'm staying optimistic for you, but sometimes you just can't beat stupid.
     
    • Like Like x 5
  6. Ian1981
    Offline

    Ian1981 Electrician's Arms

    Location:
    North east
    I'd be reluctant to even allow for 2 10kw showers never mind 3.
    If they where getting used at the same time you'd be drawing around 80 amps and that's without taking into consideration any other demand being used at the same time , cookers, hobs kettles etc.
     
    • Like Like x 2
    • Agree Agree x 2
  7. ED17
    Offline

    ED17 Regular EF Member

    Location:
    North West
    I've got a site meeting on Friday and I've asked the builder to bring the other contractors design calc's along. :grinning:
     
    • Like Like x 3
    • Optimistic Optimistic x 2
  8. Dave OCD
    Offline

    Dave OCD Electrician's Arms

    Location:
    Cornwall
    Business Name:
    Hendry Electrical Services
    1 electric shower per 100a installation would be my usual limit,and I also try my best to steer customers towards a max of 9kW, anything bigger is just bragging rights really.
     
    • Agree Agree x 3
    • Like Like x 1
  9. Leesparkykent
    Offline

    Leesparkykent You Rock Gmes Staff Member Trusted Advisor

    Location:
    Kent
    Let us know how you get on.
     
    • Agree Agree x 2
  10. Dave OCD
    Offline

    Dave OCD Electrician's Arms

    Location:
    Cornwall
    Business Name:
    Hendry Electrical Services
    No Lee it's know not no. :D
     
    • Like Like x 1
    Last edited by a moderator: Aug 8, 2017
  11. ED17
    Offline

    ED17 Regular EF Member

    Location:
    North West
    Will do.
     
    • Like Like x 1
  12. ED17
    Offline

    ED17 Regular EF Member

    Location:
    North West
    It might be a "no" from the builder :p
     
    • Funny Funny x 3
  13. Dave OCD
    Offline

    Dave OCD Electrician's Arms

    Location:
    Cornwall
    Business Name:
    Hendry Electrical Services
    And Lee has sorted out his spelling now. :D
     
    • Like Like x 1
    • Funny Funny x 1
  14. Leesparkykent
    Offline

    Leesparkykent You Rock Gmes Staff Member Trusted Advisor

    Location:
    Kent
    My spelling and grammar is awful....That's what you get for leaving school at 13 I suppose lol. My electrics are the bollox though :p
     
    • Like Like x 5
  15. Wilko
    Offline

    Wilko Electrician's Arms

    Location:
    Berkshire
    Business Name:
    Wilko Electrics
    My Other Half was an English teacher, oh the pain ...
     
    • Like Like x 3
Loading...
Similar Threads - Many 10kw Showers Forum Date
How many smoke alarms are required? Electrical Wiring, Theories and Regulations Jun 30, 2017
Working out how many IR heaters Electrical Wiring, Theories and Regulations Jun 29, 2017
Pete's Videos How many times have you been on site and watched a builder try and fit a plug top Electrical Forum Jun 25, 2017
How many ethernet sockets to install? Electrical Forum May 19, 2017
why so many wires just for a light? DIY Electrical Forum Apr 24, 2017
I am looking for Porcelanosa Borneo Blanco wall tiles, size 8" x 12", many thanks Tiles - Advice on installing and buying tile Mar 1, 2017

Share This Page

  • Electricians Directory Post a Domestic Job Post a Commercial Job