thanks Graeme,
that's all good info.
It's location will be not conducive to man-made shade - of the natural variety, however, i'm not so certain...
I believe they do have heating elements.
it'll be run off solar-panels as it's location is not near a power supply. I believe this was a contributing factor for the selection.
I'll keep you posted on it's progress. I think it should be installed in a few weeks/months.