Hi Chris
Are you a carer with a lot of hogs coming through? They are a nice idea, I’m not sure it’s worth the money if not.
I see hundreds of hogs every year and rely on heat pads ( also available through the BHPS ). You can get several heat pads for the price of one incubator. They work perfectly and are easily cleaned.
I have made fleece socks that they slip into so they don’t get too mucky and I use fleece blankets for on top as they don’t get pulled easily by the prickles but keep the hogs warm.
If you still want the incubator then I’d say the medium size as you’d need to put food and water into it also
