Can anyone recommend a good outdoor heater?

[Hulababy]

We are currently having our garden done. It will be primarily deck and artificial grass, with some pots for greenery and flowers, to cut down on maintenance. :)

We'd like to make use of the new space when its ready but living in Yorkshire we know that, in reality, we need to make the space warmer in the evenings for it to genuinely get extended use. I also ready have some fleece blankets ready to match the new furniture out there!

So, can anyone recommend the best way to get some warmth outdoors, for the evenings?

It will be deck so we need to take care of anything that gets too warm as we don't want to damage the deck itself.

Thank you

[Hulababy]

Anyone?