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<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=531115801-19042011>I submit that you need to look more closely
at this.</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=531115801-19042011></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=531115801-19042011>Last
choice depends very much on where you are and how you are being supplied with
electricity.</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=531115801-19042011></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=531115801-19042011>Both
standard electric HW storage tanks <U>and</U> instant electrics are banned for
new residential construction in most states of Australia. In the 21st
century, nobody would ever use a tankless electric unless there was very good
reason for doing so, and the main reason is that they are replacing one that was
there before.</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=531115801-19042011></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=531115801-19042011>Most
supply authorities have off-peak rates or some sort of smart metering. Consumers
are unlikely to be able to take advantage of this with a tankless heater. In
short, it can cost serious money to take a shower when you want one,
rather than when the supplier thinks it is a good idea.</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=531115801-19042011></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=531115801-19042011>All
other things being equal, a storage heater is probably a cheaper way to
heat water simply because a tankless is essentially devoid of insulation. If you
live in a place with foul weather and heat losses from a tank worry you, they
can probably be rectified in a sensible manner and a lot better than resorting
to tankless. Yes, I recognise that stored water is usually hotter than instant
water but I don't think there is much in that.</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=531115801-19042011></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=531115801-19042011>Again,
all other things being equal, it takes the same ergs to heat the water no matter
which way. A tank is not heated all the time, it is heated only for as long as
the 3600 watt heater takes to heat the water, and provided the timer is
on. The biggest residential heater I know of is 3.6 kW, most are
2.4. The smallest instant I know of is 13kW and many are twice
that.</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=531115801-19042011></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=531115801-19042011>If you
are on uniform rates, i.e. no off-peak rates, and supplied by limitless nuclear
or hydro power, then maybe tankless electric is more of a proposition. If you
are on coal-power generators, we had better not talk about it, This is a green
building forum.</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=531115801-19042011></SPAN></FONT> </DIV>
<P><FONT size=2>Nick Pyner<BR><BR>Dee Why NSW </FONT></P>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B>
greenbuilding-bounces@lists.bioenergylists.org
[mailto:greenbuilding-bounces@lists.bioenergylists.org]<B>On Behalf Of
</B>Matt Dirksen<BR><B>Sent:</B> Tuesday, 19 April 2011 10:53 AM<BR><B>To:</B>
Green Building<BR><B>Subject:</B> Re: [Greenbuilding] Opinions on electric
tankless HW heaters?<BR><BR></FONT></DIV>
<DIV>Thanks Nick</DIV>
<DIV><BR></DIV>
<DIV>"Last" choice is a standard electric hw tank. HP heater would not work
because of the size and sound issues. Due to the client's schedule, the
on-demand kw blast would never come close to a hw tank heating water all the
time. <BR><BR></DIV>
<DIV>I'll look into Stiebel Eltron.<BR>
<DIV><BR></DIV>
<DIV><SPAN class=Apple-style-span
style="-webkit-tap-highlight-color: rgba(26, 26, 26, 0.296875); -webkit-composition-fill-color: rgba(175, 192, 227, 0.230469); -webkit-composition-frame-color: rgba(77, 128, 180, 0.230469)">Matt</SPAN></DIV>
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