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9.5kw or 10.5kw shower?
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# 1
vikkic
Old 14-02-2006, 2:28 PM
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Default 9.5kw or 10.5kw shower?

Can anyone tell me whether it's worth paying the extra money for a 10.5kw electric shower, or will a 9.5kw be OK - I've got an 8.5kw at the moment which needs replacing and don't know whether the extra money is worth spending.

Thanks
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# 2
Browntoa
Old 14-02-2006, 3:02 PM
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the cabling + fuses for the existing one may not support the higher rated shower anyway
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# 3
Sooler
Old 14-02-2006, 3:23 PM
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As a 8.5 KW one had been sufficient we replaced ours with a 9.5 KW.

We did have to have the wiring upgraded as the existing electrical cable (4mm) was too small for current requirements (8mm I think) and you also have to have a RCD circuit breaker device if you don't have a RCD fusebox.
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# 4
mercurystar999
Old 14-02-2006, 5:32 PM
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No electric shower is that good. I wouldn't of thought you would notice a difference. Depending on what kind of plunbing system you have havr you thought of a power shower?
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# 5
mr_fishbulb
Old 14-02-2006, 5:50 PM
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What's the difference between an electric shower and a power shower?
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# 6
caveat_emptor
Old 14-02-2006, 6:12 PM
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Quote:
Originally Posted by mr_fishbulb
What's the difference between an electric shower and a power shower?
Electric uses the pressure in the supply pipe, which if from loft tank can be low and power shower is pump assisted.
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# 7
jennifernil
Old 14-02-2006, 7:26 PM
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What type of hot water system do you have? These electric showers are not that great, get it changed to run off "proper" hot water if you can. If you have a combi boiler you cannot have a "power shower", but usually the pressure is so good you would not need one. We recently replaced our daughter's electric shower with a thermostatic one through the bath mixer, it is so powerful the water bounces out of the bath!!!!! ( she has a combi boiler)
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# 8
Doonhamer
Old 14-02-2006, 9:57 PM
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Easiest and cheapest thing for you to do is to replace it with another electric one, though a thermostatic one off the hot water is much better.

If you go for 10.5kW I would think that you will need 10mm cable and I doubt that you will have this, I would be almost certain that you have 6mm.

If you were happy with the 8.5kW one just go for the 9.5kW.
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# 9
vikkic
Old 15-02-2006, 10:06 AM
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My cold water comes straight from the mains rather than stored in a tank.

I'm sorry to be thick, but other than a 10kw shower heating the water quicker(??) what are the benefits? ie. what does it do that a 8.5kw or 9.5kw doesn't?

Cheers
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# 10
Browntoa
Old 15-02-2006, 10:21 AM
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does nothing apart from heat the water quicker like you say

I've got a 7kw one downstairs and an 8.5kw upstairs abd I don't really notice the difference once you have set the temperature to how you like it

if it's a Triton shower they have a guide that shows you the equivalent modern model on their web site, my new one went straight back on the old plumbing, just had to re-align the cable slightly
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# 11
dadrock
Old 15-02-2006, 11:53 AM
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An electric shower should always be from the Mains pipe and not gravity-fed from a tank in the attic.

Upgrade your cable to 10mm and consider a 9.8kw one?
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# 12
Doonhamer
Old 15-02-2006, 12:06 PM
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It's not that it heats the water quicker, it heats it more. The temperature dial on a shower alters the flow of water through the heater. The more powerful the shower the more flow you get at a given temperature.
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# 13
Browntoa
Old 15-02-2006, 12:17 PM
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kilowatt-hour

The kilowatt-hour (symbolized kWh) is a unit of energy equivalent to one kilowatt (1 kW) of power expended for one hour (1 h) of time.

so basic maths says 8.5 kw will heat water quicker than a 7 kw....

flow has to do with the water pressure
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# 14
Doonhamer
Old 15-02-2006, 12:55 PM
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The temperature adjustment on an electric shower adjusts the flow of water through the shower, it is just a valve. The heater in the shower is a tiny tank that the water flows through. The more kW the shower has the bigger the temperature increase in the water between the inlet and outlet of the shower at a given flow. So a more powerful shower will heat the water more (faster if you like)allowing you to increase the flow. This means that a shower with more kW gives you more flow of water at the same temperature as a lower kW one.
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# 15
grumbler
Old 15-02-2006, 2:29 PM
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A few threads with useful information:
Is this electric shower any good?
Electric Power Shower
What's the difference between a Power Shower and an Electric Shower?
upgrading Shower
Approximately how much will it cost to install an electric shower? (further links inside)
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# 16
BeepBeep
Old 15-02-2006, 4:25 PM
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Quote:
Originally Posted by caveat_emptor
Electric uses the pressure in the supply pipe, which if from loft tank can be low and power shower is pump assisted.
Would a power shower just use a reservoir between the loft tank and shower with an integral pump? Would it use both cold and hot water feeds? I'm checking the web also for this info; but if anyone can point me in the direction of useful links for power showers, it'll be much appreciated. Thanks.
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# 17
jennifernil
Old 15-02-2006, 10:06 PM
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As the water is heated quicker you can turn it on more and get more "skoosh" , so a better shower.
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# 18
bernlyn
Old 16-02-2006, 10:46 AM
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just bookmarking this
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# 19
Doonhamer
Old 16-02-2006, 12:16 PM
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Quote:
Originally Posted by BeepBeep
Would a power shower just use a reservoir between the loft tank and shower with an integral pump? Would it use both cold and hot water feeds? I'm checking the web also for this info; but if anyone can point me in the direction of useful links for power showers, it'll be much appreciated. Thanks.
A tank fed thermostatic shower has a hot and a cold feed to it. To ensure that the hot and cold pressures are equal the cold comes off the header tank in the loft that feeds the hot water tank, not direct from the mains. So both sides of the shower have the pressure generated by the hight of the loft tank above the shower head.

To make this a power shower you fit a twin impeller pump. The cold goes in one section and the hot in the other. It goes just before the shower, so it is after the hot water tank.

It effectively sucks the water from the hot tank and from the header tank to give a flow higher than you just get from gravity alone. It is as if you have raised the header tank higher up.

A typical pump is abour 2 Bar and a 1 Bar is 10m of water. So a 2 Bar power shower is like having your header tank 20m above your shower.
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# 20
fatbobbutler
Old 05-12-2008, 5:31 PM
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I've got the opposite problem, I've had an 10.5kw shower for 3 years and it finally gave up the ghost last week. I looked online for a replacement and noticed the 9.5kw model at half price and so obviously snapped it up. Can I down grade from 10.5 to 9.5 using the existing wiring???
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