We've had our patio heater for over a year now (best investment EVER) the top that came with it, got weathered really quickly, and started to crackle and crumble. Just got our new cover yesterday and while I can't say how it will weather in the next year, it's construct is WAY better than the original issue cover.
We bought two of these for our stand up outdoor propane heaters. Ours do not need the bottom base cover as ours has a propane tank enclosed by the ceramic brick stand. It goes on easily provided you are tall like me.
We bought this cover instead of a full length cover thinking it would be less awkward. It fits our new heater well but is a little fussy to get on. Maybe we just need to apply it to get the learning curve.
Purchased two of these covers for our patio heaters. They fit snugly and cover the knobs as well as the top of the heater. Glad to have found a heavier duty cover for our heaters.