Regulation Water services
F
elton
Julie
iStock/
Domestic hot water generation: • Softwood boarding;
open vented systems • Marine grade plywood;
Cisterns manufactured in plastics are required • Chipboard grade P5; and
to remain safe for at least 500 hours at boiling • Orientated strand board grade OSB3.
temperature, and they are perfectly safe when correctly To comply with the ethos of the Construction
installed. The changes are designed to minimise the (Design and Management) Regulations 2007, storage
risk of cisterns being subjected to dangerous situations. cisterns in lofts should be provided with a boarded
They require the inclusion of immersion heaters walk/crawl-way from the loft access hatch, and a
which have a non-resetting high temperature cut-out boarded working space on one side of the cistern to
in addition to the normal thermostatic control; and a allow maintenance.
proper base support for storage cisterns.
Unfortunately, there is no guidance about what is Domestic hot water generation – high
considered to be a suitable moisture-resistant base temperature primary sources
material, whereas the National House Building Council The new Part G seeks to ensure that all domestic
(NHBC) has published a Good Craftsmanship Guide hot water generation methods are provided with a
(2002), which lists the following as acceptable: reasonably equal level of user safety. This requires that >
www.cibsejournal.com November 2009 CIBSE Journal 31
CIBSEnov09 pp30-32 PartG.indd 31 22/10/09 16:52:32
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