Heated seed beds?

I have a couple of heated mats made for gardening and a vivarium one that was given me, to be honest I wouldn't use the vivarium one in the greenhouse but it's as sealed as the ones for the garden, I like the garden ones because you can put them in a windowsill or shed or greenhouse, if your main propagators are full you can pop a couple of those cheap tray and lid things from wilko and it gives you a little bit more capacity.

 

@mazambo the ones for gardening (top pic) are the ones I'm trying to figure out a re-purpose.

 

I'm absolutely certain you'll do just that not knowing any better last year I used them to start off trays of begonia, worked pretty well.

 

I've got 6 of the things and so a lot of plugs. Wish I'd known about the bigger ones earlier What the heck. I've got sand and stuff - experimenting shall begin soon