I no longer use an enclosure for the time being, as it’s warmed up and I’ve taken it to the shed.

But this little heater puts out some heat. There’s a safety pressure switch I had taped in place in order to hang it in the enclosure, a risk I accepted.

https://www.amazon.com/gp/product/B08DFG716Q/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1