curious chickee
Songster
Not sure but I think some people have fit that many or even 24, 25 under the padsome add a second smaller one though or connect too but a lot fit under there. Another thing people do is flatten it out like a heat plate rather than the cave design, that's how most of the people fit so many since more can fit that way
I have used both, my LF had no problems I could fit 15 under the X- large but no more than that. My bantams are a different story, they squished each other under the heating pad. I had 12 and lost a few from being smashed. They like to sleep in dog piles. I switched them to a 75 watt heat lamp and they are happier still sleep in small clumps of 3-4 chicks but Spread out. I can brood 15-20 no problems.