If you use a brooder heater like the brinsea type and you use it in a coop outdoors from day 1 how long will they need to use it? It seems that they will need larger heaters as they grow, not just a taller one but wider so they wouldn’t run out of space. I understand that the legs of the heater are adjustable to raise higher as they grow but it doesn’t get any wider. So my question is how many chicks can actually spend all their heat-needing weeks with a heater claiming it broods 20 chicks?