UP Mini 2 - Very slow to heat bed

I have just purchased a used Up Mini 2 and I’m finding it very slow to heat the bed. In 15 mins I’m lucky to get it to 70 Degrees.

Without preheat selected I can still print but it would be nice to get to 100 deg first.
Is this as simple as getting a replacement bed or is there another common issue that needs to be resolved?

It won’t go much over 70 unless you insulate it - and then it will after a while break from the elevated temperature.

So you need heavy modifications or a different printer to get to 100C. (I’d print parts for a Voron0 and return the Tiertime as it doesn’t live up to advertised specs…)