I don't know what a hydrofarm farm heat element is
We probably have those heating elements that you put in the water troughs for livestock or dog water buckets. We have a heat rock that my grandson used when he had a snake and I think I'll rig something up with that for now as I took my 7yr old grand daughter out seed hunting this morning and we
have to sit down and get them started. Yikes... I'm close to getting off the thread subject so will post what we're planting on the appropriate thread!
Deb