:: 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/min

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 is=
=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 supply=
=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 degrees,=
=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  individual=
=20
or Personnel Department, and public if addressed to a blog,  forum or news=
=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
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.