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Doctor Drivel
simond said:If anybody is making things up here, shouldn't you be looking a bit closer to home?
NB: Still waiting for the unvented cylinder that is rated at 4bar and above,
Hint...Look at the quality makers.
and the heatstore manufacturer producing a HS using 60-65C water.
Get in touch with them. Lay down your specs and see what the come up with.