A tip for running Mamods;-
Do not run it for any longer than 1 or 2 fuel tabs! The water level sight glass in the backhead is only plastic, if the water level gets two low the heat in the boiler melts the plastic, with water n steam gushing out. It's not violent but that's the end of the sight glass, spares are available.
But knowing this and keeping an eye on the water level, not running it for more than 2 fuel tabs, this can be avoided.
Eoin