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  • t r
    • #2
    • 19th Apr 08, 9:58 PM
    • #2
    • 19th Apr 08, 9:58 PM
    My experience is that you won't need a power shower with a combi boiler because your hot water is at mains pressure.
    (don't think you can run a power shower off a standard combi though)
    My opinions are purely my own act on them at your own risk
  • Bungarm2001
    • #3
    • 19th Apr 08, 11:14 PM
    • #3
    • 19th Apr 08, 11:14 PM
    Short answer is no.

    As I understand it, a power shower runs off a hot water cylinder; the pump runs between the cylinder and shower and pumps water at high pressure.

    A combi boiler doesn't (usually) have a separate hot water cylinder and the shower will run at mains pressure (more or less) straight through the boiler via it's own internal pump. You might find no or very little difference in water pressure at the shower depending on which combi you install.

    I don't think you can install a pump between the boiler and the shower...I don't think the pressures would be right. I could be wrong...maybe someone here can correct me.
    Last edited by Bungarm2001; 19-04-2008 at 11:18 PM.
  • Canucklehead
    • #4
    • 20th Apr 08, 9:06 AM
    • #4
    • 20th Apr 08, 9:06 AM
    As I understand it, a power shower runs off a hot water cylinder; the pump runs between the cylinder and shower and pumps water at high pressure.
    Essentially yes.

    A combi boiler doesn't (usually) have a separate hot water cylinder and the shower will run at mains pressure (more or less) straight through the boiler via it's own internal pump. You might find no or very little difference in water pressure at the shower depending on which combi you install.
    Almost. The boiler does not pump water to the taps. Myself and OH keep harping on about getting a combi with a good flow rate/kw output.Plus having a good mains water pressure and flow rate. That is what will give you a powerFULL shower.


    I don't think you can install a pump between the boiler and the shower...I don't think the pressures would be right. I could be wrong...maybe someone here can correct me.
    Mains water cannot be pumped.(well I suppose it can, but it MUST NOT be pumped)

    Corgi Guy.
    Ask to see CIPHE (Chartered Institute of Plumbing & Heating Engineering)
  • roddydogs
    • #5
    • 20th Apr 08, 9:13 AM
    • #5
    • 20th Apr 08, 9:13 AM
    A combi will give you a nice powerful shower-with one BIG but-if anyone or anything uses any mains water elsewhere-ie washing machine, etc be prepared to get freezing water suddenly coming out of the shower!
  • Canucklehead
    • #6
    • 20th Apr 08, 9:25 AM
    • #6
    • 20th Apr 08, 9:25 AM
    A combi will give you a nice powerful shower-with one BIG but-if anyone or anything uses any mains water elsewhere-ie washing machine, etc be prepared to get freezing water suddenly coming out of the shower!
    Originally posted by roddydogs
    Solution: Thermostatic shower mixer... here and here

    Corgi Guy
    Last edited by Canucklehead; 20-04-2008 at 11:16 AM. Reason: added link
    Ask to see CIPHE (Chartered Institute of Plumbing & Heating Engineering)
  • Bungarm2001
    • #7
    • 21st Apr 08, 10:58 PM
    • #7
    • 21st Apr 08, 10:58 PM
    My thermo mixers (2 showers) do the job really well. If the washer is on it doesn't affect the flow, nor does flushing the loo or turning the ktchen tap on, BUT I never have had the courage to let both showers be run at the same time...just in case!! We do have high water pressure here which helps I guess
  • bexsmum
    • #8
    • 24th Apr 08, 2:40 PM
    • #8
    • 24th Apr 08, 2:40 PM
    Please can I hijack this thread! I need help desperately.

    A month ago I had a combi boiler fitted (thankfully with the help of a grant). I previously had a Mira Excel power shower which was connected to the hot and cold water supply. The pressure of the new boiler did something to the inside fitments of the existing shower, it sprung a leak and my (bright spark) father said the best idea would be to cap off the hot water (as there's no longer a hot water tank to take the water from) and fit a bog standard electric shower.

    Off I trots to B&Q spent 100 on a normal electric shower which said on the box it'd work with a combi boiler, half-a-job dad fits the shower no problem but as soon as its turned on we found that the cabling wasn't sufficient. On further investigation we've found the cable is normal grey (I'm a woman and not an electrician) cabling which we've traced back to a connection to a light fitment in the loft!

    Subsequently - I got an electrician out who has said that I need a new electricity supply to the shower, which is connected to the fuse box with a 40amp fuse. No problem - except the electrician is now saying that I need a new cold water supply to be taken to the shower and the existing cold water supply can't be used.

    One - is this right?
    Two - can someone just point me in the direction of a shower I can go and buy I've read loads on the internet and I just want someone to say "buy that and it'll be fine!"

    Thanks in advance and sorry for the waffling on!
    Now Mrs! Still mum though....
    Holiday 2013
    January - Dubai
    August - Disney World & New York
  • benjus
    • #9
    • 24th Apr 08, 3:43 PM
    • #9
    • 24th Apr 08, 3:43 PM
    I previously had a Mira Excel power shower which was connected to the hot and cold water supply.
    Originally posted by bexsmum
    The Mira Excel is an excellent shower - but it is a thermostatic mixer, not a power shower. It could be used in conjunction with a separate pump to make a power shower but it can work equally well with a combi boiler and produce a very good flow. It's certainly better than a 100 B&Q electric shower in my experience.

    The pressure of the new boiler did something to the inside fitments of the existing shower, it sprung a leak
    Originally posted by bexsmum
    I would guess that this was because after the combi was fitted the cold water supply was connected directly to the mains rather than the cold water tank.

    the best idea would be to cap off the hot water (as there's no longer a hot water tank to take the water from)
    Originally posted by bexsmum
    Did they not connect the hot water inflow on the Mira Excel to the hot water from the combi boiler? I assume you have hot water in your bathroom now...?

    a normal electric shower which said on the box it'd work with a combi boiler
    Originally posted by bexsmum
    :confused: I don't understand this... did you buy an instantaneous electric shower (i.e. one with a power rating of 7.5Kw to 10.5kW)? If so, it has nothing to do with the boiler, and runs directly from the mains cold water supply. So it's not quite accurate to say it works with a combi boiler, just that it has absolutely no connection with the boiler at all.

    On further investigation we've found the cable is normal grey (I'm a woman and not an electrician) cabling which we've traced back to a connection to a light fitment in the loft!
    Originally posted by bexsmum
    Yikes! You're lucky you didn't start a fire... sounds like you are trying to run a shower on wiring from the lighting circuit.

    Subsequently - I got an electrician out who has said that I need a new electricity supply to the shower, which is connected to the fuse box with a 40amp fuse. No problem - except the electrician is now saying that I need a new cold water supply to be taken to the shower and the existing cold water supply can't be used.
    Originally posted by bexsmum
    You do indeed need a high power electricity supply for an electric shower which will need to be run from the fuse box/consumer unit.

    I don't know why there would be a problem with your water supply. I assume that all the cold water taps and the shower were connected directly to the mains water supply when the combi was fitted (combis are usually fitted without a cold water tank). You would need to find out why he says you need a new water supply.

    Two - can someone just point me in the direction of a shower I can go and buy I've read loads on the internet and I just want someone to say "buy that and it'll be fine!"
    Originally posted by bexsmum
    Personally I'd have stuck with the Mira Excel - it's a great shower and works well with a combi boiler. Could you get it fixed or replaced or is it too late?
  • Canucklehead
    Please can I hijack this thread! I need help desperately.

    A month ago I had a combi boiler fitted (thankfully with the help of a grant). I previously had a Mira Excel power shower which was connected to the hot and cold water supply. The pressure of the new boiler did something to the inside fitments of the existing shower, it sprung a leak and my (bright spark) father said the best idea would be to cap off the hot water (as there's no longer a hot water tank to take the water from) and fit a bog standard electric shower.

    Off I trots to B&Q spent 100 on a normal electric shower which said on the box it'd work with a combi boiler, half-a-job dad fits the shower no problem but as soon as its turned on we found that the cabling wasn't sufficient. On further investigation we've found the cable is normal grey (I'm a woman and not an electrician) cabling which we've traced back to a connection to a light fitment in the loft!

    Subsequently - I got an electrician out who has said that I need a new electricity supply to the shower, which is connected to the fuse box with a 40amp fuse. No problem - except the electrician is now saying that I need a new cold water supply to be taken to the shower and the existing cold water supply can't be used.

    One - is this right?
    Two - can someone just point me in the direction of a shower I can go and buy I've read loads on the internet and I just want someone to say "buy that and it'll be fine!"

    Thanks in advance and sorry for the waffling on!
    Originally posted by bexsmum
    Good afternoon: If you haven't already, look at the links I provided in Post 6 on this thread then visit Mira and use the 'select a shower' facility for something appropriate to your needs. Were you not advised about the implications of switching to a combi before your old boiler (?) was replaced?

    HTH

    Canucklehead
    Ask to see CIPHE (Chartered Institute of Plumbing & Heating Engineering)
  • benjus
    By the way bexsmum, did you know it's been illegal for a few years now to do major electrical work in the home (anything involving kitchens, bathrooms or non-trivial alterations to circuits) unless it is undertaken or inspected by a qualified electrian? Your situation is a good example of the rationale behind this, as you could easily cause a fire by running a high-power appliance on low-power cabling.
  • want2bmortgage3
    ive got a combi boiler and a mira combiforce shower, the pressure is fine and it gets up to temp in no time. the shower head has different settings, some more powerful and some for saving water (but still powerful enough). it has a thermostatic control which works well in controlling the heat.
  • bexsmum
    Hi All,

    Its safe to say that last August I bought the house from hell! The shower was wired by the previous people not me (and I now know its a miracle that my daughter and I are still alive). It'd be easier to list everything that's I haven't had to replace in the house than what I have!

    The shower's already gone the journey - I had previously replaced the solinoid and a rubber pipe and the pump was going to be another 80 ontop of the 60 I've already spent.

    Yesterday after posting this I spoke to my lovely next door neighbour. His son has his own bathroom fitting company. He came round, took one look at it and said what a waste of time/effort and money the electric shower was. He's told me where to go, what to ask for and he's coming next week to fit it and re-tile the shower cubicle. He's said that as there is a hot and cold water supply - I can get a simple thermostatic mixer shower - which will get rid of the need for any dodgy electricity circuits in the en-suite!!

    I just want to say thank you to everyone - your advice has been invaluable and I'll be back with another catastorphe soon I'm sure
    Now Mrs! Still mum though....
    Holiday 2013
    January - Dubai
    August - Disney World & New York
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