I can work it out for my electric shower i.e. 9.5 kw @ 10p per kw/hour =
95/4 = 23.75p for a 15 min shower.
But how would that compare to a WB 40 kw combi or a 28kw system boiler and
high recovery cylinder / megaflow / thermal store ?
I would imagine the combi being chaper to run but its 40 kw !!!

Regards Jeff

Jeff wrote:
> I can work it out for my electric shower i.e. 9.5 kw @ 10p per
kw/hour =
> 95/4 = 23.75p for a 15 min shower.
> But how would that compare to a WB 40 kw combi or a 28kw system
boiler and
> high recovery cylinder / megaflow / thermal store ?
> I would imagine the combi being chaper to run but its 40 kw !!!
>
> Regards Jeff


No idea about cost but unless your washing your partner as well, 15
minutes seems far too long to me!

"Jeff" <(E-Mail Removed)> wrote in message
news:420a93f3$0$21962$(E-Mail Removed) ...
> I can work it out for my electric shower i.e. 9.5 kw @ 10p per kw/hour =
> 95/4 = 23.75p for a 15 min shower.
> But how would that compare to a WB 40 kw combi or a 28kw system boiler and
> high recovery cylinder / megaflow / thermal store ?
> I would imagine the combi being chaper to run but its 40 kw !!!

But you still use the same energy. So assuming boiler is say 85% efficient
you can multiply the number of kilowatts used by 1/0.085 or whatever then
multiply by the cost per kW of the gas and you'll find it's about one-third
the price.

And why DO you need a 15 minute shower ? ;-)

"Mike" <(E-Mail Removed)> wrote in message
news:cue6rf$7a8$(E-Mail Removed)...
>
> "Jeff" <(E-Mail Removed)> wrote in message
> news:420a93f3$0$21962$(E-Mail Removed) ...
> > I can work it out for my electric shower i.e. 9.5 kw @ 10p per kw/hour =
> > 95/4 = 23.75p for a 15 min shower.
> > But how would that compare to a WB 40 kw combi or a 28kw system boiler
and
> > high recovery cylinder / megaflow / thermal store ?
> > I would imagine the combi being chaper to run but its 40 kw !!!
>
> But you still use the same energy. So assuming boiler is say 85%
efficient
> you can multiply the number of kilowatts used by 1/0.085 or whatever then
> multiply by the cost per kW of the gas and you'll find it's about
one-third
> the price.
>
so, disregarding heat exchanger losses etc you are saying that the amount of
energy reqd to heat a volume of water is constant ?


> And why DO you need a 15 minute shower ? ;-)
>

Hmm, guestimate, got me thinking now, big job though, 6'6" and a dirty
occupation :-)

Regards Jeff

"Jeff" <(E-Mail Removed)> wrote in message
news:420aa2cb$0$21920$(E-Mail Removed) ...

> so, disregarding heat exchanger losses etc you are saying that the amount
of
> energy reqd to heat a volume of water is constant ?

I'm sure somebody will pick me up on something but yes.


> > And why DO you need a 15 minute shower ? ;-)
> >
> Hmm, guestimate, got me thinking now, big job though, 6'6" and a dirty
> occupation :-)

Ah - not a two person shower then :-(

"Jeff" wrote
| so, disregarding heat exchanger losses etc you are saying that the
| amount of energy reqd to heat a volume of water is constant ?

Yes.

Can I guess you're under 35 and/or didn't do physics at school?

| > And why DO you need a 15 minute shower ? ;-)
| Hmm, guestimate, got me thinking now, big job though, 6'6" and
| a dirty occupation :-)

1. Turn water on. Get wet. Turn water off.
2. Apply soapy stuff and lather.
3. Turn water on. Rinse. Turn water off. If not clean, repeat from 2.

15 mins in shower. Water running for about half that.

Owain

Owain wrote:

> 15 mins in shower. Water running for about half that.

Or failing that splash out the 20p and enjoy a decent shower without
being a tight wad! ;-)



--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/

"Ian Stirling" <(E-Mail Removed)> wrote in message
news:420aba5c$0$73794$(E-Mail Removed)...
> Jeff <(E-Mail Removed)> wrote:
> >
> > "Mike" <(E-Mail Removed)> wrote in message
> > news:cue6rf$7a8$(E-Mail Removed)...
> >>
> >> "Jeff" <(E-Mail Removed)> wrote in message
> >> news:420a93f3$0$21962$(E-Mail Removed) ...
> >> > I can work it out for my electric shower i.e. 9.5 kw @ 10p per
kw/hour =
> >> > 95/4 = 23.75p for a 15 min shower.
> >> > But how would that compare to a WB 40 kw combi or a 28kw system
boiler
> > and
> >> > high recovery cylinder / megaflow / thermal store ?
> >> > I would imagine the combi being chaper to run but its 40 kw !!!
> >>
> >> But you still use the same energy. So assuming boiler is say 85%
> > efficient
> >> you can multiply the number of kilowatts used by 1/0.085 or whatever
then
> >> multiply by the cost per kW of the gas and you'll find it's about
> > one-third
> >> the price.
> >>
> > so, disregarding heat exchanger losses etc you are saying that the
amount of
> > energy reqd to heat a volume of water is constant ?
> >
> Yes.
> What might reduce the electric shower costs to near gas levels (?) would
> be to fit a heat exchanger to take the output water from the shower,
> and use it to heat the incoming cold.

Oh dawd. You'll start Drivel off again with his concentric copper pipes.

"Mike" <(E-Mail Removed)> wrote in message
news:cue6rf$7a8$(E-Mail Removed)...
>
> "Jeff" <(E-Mail Removed)> wrote in message
> news:420a93f3$0$21962$(E-Mail Removed) ...
> > I can work it out for my electric shower i.e. 9.5 kw @ 10p per kw/hour =
> > 95/4 = 23.75p for a 15 min shower.
> > But how would that compare to a WB 40 kw combi or a 28kw system boiler
and
> > high recovery cylinder / megaflow / thermal store ?
> > I would imagine the combi being chaper to run but its 40 kw !!!
>
> But you still use the same energy. So assuming boiler is say 85%
efficient
> you can multiply the number of kilowatts used by 1/0.085 or whatever then
> multiply by the cost per kW of the gas and you'll find it's about
one-third
> the price.
>
> And why DO you need a 15 minute shower ? ;-)

Because it takes that long in a 9.5kW electric-trickle shower to get the
soap rinsed off!

Owain wrote:
> "Jeff" wrote
> | so, disregarding heat exchanger losses etc you are saying that the
> | amount of energy reqd to heat a volume of water is constant ?
>
> Yes.
>
> Can I guess you're under 35 and/or didn't do physics at school?
>
> | > And why DO you need a 15 minute shower ? ;-)
> | Hmm, guestimate, got me thinking now, big job though, 6'6" and
> | a dirty occupation :-)
>
> 1. Turn water on. Get wet. Turn water off.
> 2. Apply soapy stuff and lather.
> 3. Turn water on.

Scream in pain as you are scalded by the first slug of really hot water
out of the shower because it's a cheap electric one that doesn't have
very good temperature control;-)

> Rinse. Turn water off. If not clean, repeat from 2.
>
> 15 mins in shower. Water running for about half that.
>
> Owain