How long will a 15kg Calor Gas refill last on a 3 burner mobile heater?

Another of the frequently asked questions at Towler & Staines the Calor Gas Principal Dealer is   "how long will a 15kg Calor Gas refill last on a 3 burner mobile heater?"

The answer is that on the lowest setting of 1.5kW a 15kg Calor Gas refill will last 146 hours, on the middle setting of 3kW about 105 hours and on full about 48 hours.

Of course the reality in use tends to be different, entering a cold room one usually puts the heater on full for a while before turning it down when the room has warmed up.

Mini heaters such as the Thurcroft and the Calor Mini are powered by the Calor Gas 7kg cylinder.
The heat settings are 2kW and 1kW. On full the refill will last 47 hours and on 1kW it will last 95 hours.

http://www.towler-staines.co.uk/shop/141-mobile-heaters