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			<title>Green Building Forum - lowest impact hot water solutions</title>
			<lastBuildDate>Thu, 23 May 2013 18:52:06 +0100</lastBuildDate>
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		<title>lowest impact hot water solutions</title>
		<link>http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=6249&amp;Focus=88659#Comment_88659</link>
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		<pubDate>Wed, 08 Sep 2010 10:23:39 +0100</pubDate>
		<author>Carol hunter</author>
		<description>
			<![CDATA[Hello All - So planning DHW for a small super insulated building for 2....We initially intended 2 flat plate solar collectors and associated tanks with potential for integrating a woodburning stove at some point. We now think this is over specified for our purposes and in any case can no longer afford it, especially since the building is intended for occasional use in the long term and we will be living in it temporarily. Having existed in a caravan for the past 3 years, I wonder whether the tiny electric water heater that heats all our tap water is not the best option in terms of energy efficiency...we need to heat water for a bath/shower (which we share before we are heckled mercilessly...) and a kitchen sink and bathroom basin - that's all. Any pointers in the direction of simplicity of design and energy efficiency would be much appreciated.<br />carol]]>
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		<title>lowest impact hot water solutions</title>
		<link>http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=6249&amp;Focus=88662#Comment_88662</link>
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		<pubDate>Wed, 08 Sep 2010 10:37:03 +0100</pubDate>
		<author>CWatters</author>
		<description>
			<![CDATA[Heating volumes of water using electricity directly is about the worst way to do it unless you are on a 100% green tariff. But if you can't afford solar can you afford a 100% green tariff?<br /><br />This table has C02 figures per KWH for different fuels and methods of heating, however they may not be accurate or accurate for low volume users. They assume more typical tariffs for electricity (eg not 100% green).<br /><br /><a href="http://www.nottenergy.com/energy-costs-comparison3" target="_self" rel="nofollow">http://www.nottenergy.com/energy-costs-comparison3</a>]]>
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		<title>lowest impact hot water solutions</title>
		<link>http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=6249&amp;Focus=88665#Comment_88665</link>
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		<pubDate>Wed, 08 Sep 2010 10:44:29 +0100</pubDate>
		<author>SteamyTea</author>
		<description>
			<![CDATA[Currently mains gas is your best bet (cost and environmentally).  But if you want to put a higher priority onto the environmental side then have you considered installing PV.  I know that the initial capital cost is high (get a loan to cover it) but with the introduction of FIT and the occasional use your building is for you may be able to benefit financially because of the different tariffs offered for exporting, importing and own usage.]]>
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		<title>lowest impact hot water solutions</title>
		<link>http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=6249&amp;Focus=88668#Comment_88668</link>
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		<pubDate>Wed, 08 Sep 2010 11:16:31 +0100</pubDate>
		<author>marktime</author>
		<description>
			<![CDATA[We are water and electricity misers as part of our green contribution and currently we have a 50 litre electric water heater that takes approx 30 mins to reach 60 deg C. It's then switched off and used for two showers. Now our "shower process"  is drench/shampoo/drench/bath gel/ final rinse. After each drench the water is turned off whilst soaping up. <br /><br />We use less than 70 litres/person/day. A 50 litre water heater costs less than 400 euros and 1 kWh costs 0.12 euros.]]>
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		<title>lowest impact hot water solutions</title>
		<link>http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=6249&amp;Focus=88679#Comment_88679</link>
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		<pubDate>Wed, 08 Sep 2010 12:26:53 +0100</pubDate>
		<author>SteamyTea</author>
		<description>
			<![CDATA[<blockquote ><cite >Posted By: marktime</cite>drench</blockquote><br />My process is similar but at 11 litres/min.  Got it down to 3 minutes for a good shower, 2 for a quickie. Not that this is a competition yet.<br /><br />What size heating element does it have Marktime?]]>
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		<title>lowest impact hot water solutions</title>
		<link>http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=6249&amp;Focus=88693#Comment_88693</link>
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		<pubDate>Wed, 08 Sep 2010 14:05:47 +0100</pubDate>
		<author>marktime</author>
		<description>
			<![CDATA[1.25 kW.  When we build I will have a similar set-up with a passive solar feed to an internal coil. Standard kit here. With my climate I don't expect to use much leccy at all and moving water through such a small capacity system means I have no or minimal legionella risk.<br /><br />Hope all this info is useful to the OP.]]>
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		<title>lowest impact hot water solutions</title>
		<link>http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=6249&amp;Focus=88768#Comment_88768</link>
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		<pubDate>Thu, 09 Sep 2010 10:26:52 +0100</pubDate>
		<author>evan</author>
		<description>
			<![CDATA[You could DIY some solar heating, and top the temperature up with electric or gas as needed.]]>
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		<title>lowest impact hot water solutions</title>
		<link>http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=6249&amp;Focus=88779#Comment_88779</link>
		<guid isPermaLink="false">http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=6249&amp;Focus=88779#Comment_88779</guid>
		<pubDate>Thu, 09 Sep 2010 12:01:10 +0100</pubDate>
		<author>barney</author>
		<description>
			<![CDATA[Personally I would advise against the solar thermal in a small infrequently used dwelling. What are you going to do with the solar input when you have no demand - indeed it could well prove to be a problem to you.<br /><br />Just use a suitably sized storage cylinder with an electric immersion element and good controls (Size for say a 1 hour reheat and fit a one shot button - by the time you occupy, unpack and have a brew then water is ready to go - particularly as you are going to be mixing hot and cols at the shower and basin anyway) <br /><br />By the time you account for the embodied energy in a more complex solution and the capital investment you could use elswhere it's debateable if any other system would be more efficient in carbon terms anyway<br /><br /><br />Regards<br /><br />Barney]]>
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