TTT We (as a building firm) have installed a few of these, they can range in price form around £60 to hundreds of pounds. It really depends on what area you are heating so looking at a few sites and reading customer feedback my be the best solution
Yo can get infra red patio and wall mounted heaters TTT. They are actually marketed as an environmentally friendly option as they work using the green and mean electrickery. Funny old world. There were no such things as outdoor heaters as far as I remember........until the anti smoking nazis banished all smokers to the ouside. So the pubs decided to pollute the atmosphere in order to maintain their businesses and protect turnover by making it a bit more comfy for the leper colonies of smokers. Pretty soon everybody wanted to sit outside under the heaters cos it was more fun than being inside. Haha.
diddly: "Oh- apparently nobody can now put an environmental point of view on this site. " - you can, start your own post or contribute to one in the appropriate section. This is H&G and it should not surprise you that people ask questions about Home and Garden.
You could search for a Kiam 2KW Electric Infrared Outdoor Garden Patio Heater Wall Mounted Waterproof .
A friend of mine has one and loves it. As for the 'virtuous' trolls, I bet some of them smoke or drive a non-electric car.