For Christmas I received* an Ecofan. It has been in almost continuous use since then, wafting the woodburner's hot air around the sitting room. It has made an amazing difference: the room has been hotter than I've known it in winter.
Of course, it could be just that we've had the stove alight more often than usual, but I don't think the effect is merely psychological.
I thought pictures of the thing in action better than seeing it stationary, but you can't see how many blades it has. So I'll tell you. Two. You can't see the cooling fins directly very well, but their shadow is visible in the top photo.
While searching for the link for the Ecofan I was pleased to discover that spare parts are available: replacement motor and replacement blades.
*I actually ordered this myself. I found the most convenient source to be canalshoponline at Whilton Chandlery.
Happy New Year to all.
(edited to remove typo)