I use a 7.5w reptile heater and it works just fine, with insulation
I bought this, have set it as high as 88 deg f and holds to within +- 0,2. Use large rubber bands strapped to a 6.5G carboy and wrap a large beach towel around it.
https://www.amazon.com/gp/product/B07GWY847D/ref=ppx_yo_dt_b_asin_title_o03_s01?ie=UTF8&psc=1
Reflective pipe wrapWhat kind of insulation?
I have only had it a short time. Have to date used it 3 times. Yes it is a bit flimsy and I think the wires / electric connections will likely be the first place it fails. With a little care I'm hopeful will last. To store it I use a scrap piece of 3" PVC with end caps, loosely role it up and place it, the temp well and the controller inside the PVC.
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