Power Shower Question
Discussion
Sounds like you have an electric shower not a power shower.
An electric shower has just a cold feed from the mains and the water is heated on demand by electricity.
A power shower is a 'pumped' shower and uses water from the hot and cold tanks.
Power showers can look like an electric shower (the pump is in the shower unit) or you could have a regular theromstatic valve in the bathroom with a seperate pump usually located in the airing cupboard.
An electric shower is powered usually by a 10mm cable directly from the board.
A power shower (or pumped shower) can be supplied by a regular 13a spur or socket.
Power shower (hot and cold tank fed):
http://www.screwfix.com/prods/66237/Bathrooms-Show...
Electric Shower (cold mains fed):
http://www.screwfix.com/prods/88963/Bathrooms-Show...
An electric shower has just a cold feed from the mains and the water is heated on demand by electricity.
A power shower is a 'pumped' shower and uses water from the hot and cold tanks.
Power showers can look like an electric shower (the pump is in the shower unit) or you could have a regular theromstatic valve in the bathroom with a seperate pump usually located in the airing cupboard.
An electric shower is powered usually by a 10mm cable directly from the board.
A power shower (or pumped shower) can be supplied by a regular 13a spur or socket.
Power shower (hot and cold tank fed):
http://www.screwfix.com/prods/66237/Bathrooms-Show...
Electric Shower (cold mains fed):
http://www.screwfix.com/prods/88963/Bathrooms-Show...
Edited by B17NNS on Monday 10th January 00:26
garycat said:
All power showers are just a cold feed. The water is heated by the shower unit. Make sure the cable is thick enough for the kW rating of your new shower, it should be at least 6mm or even 10mm and connected directly to the consumer unit.
Sorry to disagree here, but power showers definetely do not run off a cold supy only. They require a hot and cold, and either contain a small pump within the unit ( normal/industry definetion of a power shower) or are fed by a pumped, balanced hot and cold water supply. (common term for a power shower)Showers with only a cold water feed are always electric.
Griff Boy said:
garycat said:
All power showers are just a cold feed. The water is heated by the shower unit. Make sure the cable is thick enough for the kW rating of your new shower, it should be at least 6mm or even 10mm and connected directly to the consumer unit.
Sorry to disagree here, but power showers definetely do not run off a cold supy only. They require a hot and cold, and either contain a small pump within the unit ( normal/industry definetion of a power shower) or are fed by a pumped, balanced hot and cold water supply. (common term for a power shower)Showers with only a cold water feed are always electric.
OP, you definitely have an electric shower there.
http://www.homebase.co.uk/webapp/wcs/stores/servle...
What about this?
What does 9.5kw? is that its power?
What about this?
What does 9.5kw? is that its power?
N10k said:
Smiler. said:
I wouldn't put a 9.5kW unit on a 6mm² cable. It is possible with twin & earth under the right installation conditions.
I'd use 10mm².
What size is my cable?I'd use 10mm².
Does it look like 6 or 10mm?
If you do have to upgrade the cable, it is notifiable works under Part P. You will either have to get an approved domestic installer to do it or jump through hoops for building control if you DIY. You can swap the shower for a unit to the same capacity without having to use an approved domestic installer but I urge you to get it checked by somebody competent.
As previously stated, you will need a 10mm² supply for a 9.5 kW shower. A 6mm² supply would be okay in certain circumstances but you need ideal conditions (cable clipped direct to the wall, not buried in the building fabric or thermal insulation, short run) - this is rare in a typical family house.
Re. choosing a new shower, I have never had any trouble with Mira other than an O-ring failing on a unit that was about 10 years old. Mira sent a seal kit in the post free of charge. Go for the highest rating your cable can handle (get somebody competent to tell you this - they will have to inspect the cable run to verify a number of factors as the installation method affects the current carrying capacity of the cable). The higher the rating, the faster it will heat water meaning you can get a greater flow.
Edited by Ganglandboss on Wednesday 12th January 14:25
6mm and 10mm cable should have ~7 strands per core like this
http://www.screwfix.com/prods/73076/Electrical-Sup...
http://www.screwfix.com/prods/73076/Electrical-Sup...
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