david wrote:

Doing a search for heaters and found this.....not what I am looking for but
interesting idea.
Anyone heard of them??

Greenhouse Heating

Greenheat are a company who have produced two new products to heat the
greenhouse, The Greenheat Organic Greenhouse Heater and Fuel.

The heater is fuelled by Greenheat's organic fuel gel made from sugar cane
and they claim produces no smelly toxic waste gases. They state that upon
burning the gel fuel actually emits plant food (carbon dioxide and water
vapour).

The Heater retails at around £60 and the 5 litre fuel refill retails at
£7.99 providing over 65 hours of burn time.

It sounds suspiciously like a solid version of snake oil to separate green
envirowhiners from their cash. Compare it against either a standard paraffin
greenhouse heater or better still an electric fan.

Anything that burns in the closed environment of the greenhouse will potentially
emit nasty CO and other bad things like soot if there is inadequate ventilation
or the burner is incorrectly adjusted. The water and CO2 emitted with it burning
correctly are not that useful in mid winter anyway.

Making enviro fuels from sugar cane or corn is a joke sponsored by agribusiness
lobby groups. It consumes more energy end to end than burning oil would.

Regards,
Martin Brown