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			<title>Green Building Forum - Designing extension for heat pumps + EWI</title>
			<lastBuildDate>Sat, 02 May 2026 10:16:21 +0100</lastBuildDate>
			<link>https://www.greenbuildingforum.co.uk/newforum/</link>
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		<title>Designing extension for heat pumps + EWI</title>
		<link>https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18022&amp;Focus=304263#Comment_304263</link>
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		<pubDate>Wed, 15 Nov 2023 19:28:33 +0000</pubDate>
		<author>finnian</author>
		<description>
			<![CDATA[I'm looking to rebuild my lean-to conservatory as a 'proper room'. The idea is to also get about 200mm of EWI put on the (mid-terrace no-cavity 1930s brick) building at the same time (which hopefully will improve the insulation significantly). I'm trying to specify the extension in a way that makes it as easy as possible to install a hydronic heat pump system afterwards (but maybe I should just figure out how to get the builders to work with a heating engineer). Current system is a combi boiler, which is upstairs. <br /><br />I'm hoping if I get underfloor heating in the new extension (about 15m2) I might be able to avoid having a buffer tank in the house, but I'm wondering what else I should be thinking of. i.e. if I should, for example, specify a large-diameter flow and return pipe to the back of the house where an external heat pump unit might go. Or maybe just put in a big conduit allowing access to the stairwell where most of the existing plumbing goes. I'm planning on at least having a 30A socket fitted at the rear to make it easy to provide power to an external unit.]]>
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		<title>Designing extension for heat pumps + EWI</title>
		<link>https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18022&amp;Focus=304266#Comment_304266</link>
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		<pubDate>Wed, 15 Nov 2023 21:25:03 +0000</pubDate>
		<author>tony</author>
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			<![CDATA[I would think in terms of u-values, air tightness targets. Duct is a good idea]]>
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