"With an ambient temperature of 62F, a thermometer pushed to the bottom of
the pot registers a temperature of 98F, in the middle of the pot it is
85F and resting on top it is 72F. I have compared the thermometer with
another and am happy that
it is accurate.

As a general rule I use 21c at the bottom and cooler for the tops.
--
Charlie, gardening in Cornwall.
http://www.roselandhouse.co.uk
Holders of National Plant Collection of Clematis viticella (cvs)


Many thanks Charlie - I would be down there to see you except I am in
Yorkshire. I assume you mean a temperature of 21C at the bottom of the
cutting. That is way less than than the 85F (30C) I am getting. I am
surprised that Sankey can sell a unit that is so hot.

Peter