The Brazilian shower shown in a previous post has a coiled bare nichrome
wire heating element and the coil is made into a horseshoe shape.

The water floods the chamber where the heating element is installed and
gets in direct contact with it.


Isaac



Em 27/2/2012 08:18, cdb escreveu:
> :: Back on the shower heater, how much power does it take?=20
>
> This one is 5.8KW
>
> ::What's the water flow rate?
>
> It doesn't say only the water pressure required. I guess about 3 litres/m=
in
>
> This particular type of heater only has a small heating vessel, no tank,=
=20
> though there are some that come with a 20 lt tank. So basically the cold=
=20
> water comes in circles an encapsulated heating element (the two are=20
> separated, well I hope they are, and never actually meet each other) and=
=20
> shoots out the shower head. In the UK there are also power showers, which=
=20
> are similar, but also have a pump to produce the output water pressure.=20
> Only used in low water pressure areas.
>
> As far as cost: My current hot water tank (they are outside in Australia=
=20
> now inside) which is on what is called here a 'controlled supply' (that i=
s=20
> the power company decides when they will provide power to the heater and=
=20
> for how long - total time period that the power company will enable suppl=
y=20
> is 18 hours per day, actual switch on time is much less than that. Seems =
to=20
> be about twice a day for a few hours.
>
> As far as cost is concerned - at the moment my hot water costs me 55c per=
=20
> day - which is shower and hot water for washing dishes.
>
> With a heat on demand system a 7 minute shower will cost 14c, 10 min 20c=
=20
> and a real water waster of 30 min will cost 60c.
>
> My reckoning is that if i alter my taps to heat on demand systems, my =20
> total cost per day  will be between 16 and 30c . Washing machine is cold=
=20
> fill only, and as the cold water in summer can be close to 25 - 30 degree=
s,=20
> no extra heating is required.
>
> Colin =20
> --
> cdb, colin@btech-online.co.uk on 27/02/2012
> =20
> Web presence: www.btech-online.co.uk =20
> =20
> Hosted by:  www.justhost.com.au
> =20
> =20
> This email is to be considered private if addressed to a named  individua=
l=20
> or Personnel Department, and public if addressed to a blog,  forum or new=
s=20
> article.
> =20
> =20
> =20
>
> On Sun, 26 Feb 2012 11:14:09 -0800, Harold Hallikainen wrote:
> I generally think using electricity for heating is
> :: about 1/3
> :: the efficiency of using natural gas or worse, considering power
> :: plant
> :: efficiency. Of course, there are losses in a typical gas fired
> :: tank water
> :: heater including continuous losses through the heater walls,
> :: losses when
> :: the cold pipes are heated when water flow starts, etc. So, in
> :: terms of
> :: efficiency, which wins? On demand electric or gas fired tank?
>

--=20
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