I have a "Valor Robocab" butane heater for the garage and would like to know how long (in theory) a should last on a new 7kg refill. (data below) The one I have here doesn't seem to last as long as it did - but maybe that's just imagination.
Do these heaters need cleaning somehow?
When it finally fails to light at all, there is still liquid sloshing about in the tank. It is very cold in the garage so the gas pressure is lower - but still seems a lot of liquid there.
It is difficult to start when cold (the ignition spark is strong), but have to keep it clicking away for a minute or so before the thing "latches" on. (Thermocouple?)
For the duration calcs:- The data plate says
2.84 kW/hr 9690 btu/h(And 204G/hr - don't know what the heck that is)