Geoff,

I am going to get another HE, can you advise the metal composition, if there is one without copper it would be good but bad in terms of heat trannsfer as copper is so good at it.

Will be trying them for solar hot water heat transfer! Also need a set of 1 micron filters to clean my bio.

Matt

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Biodiesel Bandit

Landcruiser 98 B100
Peugeot 306 stdt B100
Peugeot 2004 2L 307 HDI Does not like B100