Remember that propane gas bottle pigtails are Left hand thread. So righty loosens and lefty tightens rather than the usual way.I tried removing the pipe but it was so tight I couldn't do it with my spanner.
Gas bottles are, or at least used to be, a relatively expensive way of heating a home. Bulk tank LPG users over on the MSE forum are reporting around 50p/litre + 5% vat ( at 7.08 kWh/litre of propane) = 7.42 p/kWh.
My last Kerosene (oil) fill was at 7.83 p/kWh. I've burned through some 1,225 kWh in the last 20 days (1/10 of a tankful) not atypical for the Winter months for us.
It's what Calor state in their Specs as maximum, with nearly 30 kg as minimum tare https://shop.calor.co.uk/47kg-propane-gas-bottle.htmlGross weight 105kg???
That would suggest the tare (empty weight) of the bottle is 58kgs. 20 something would be nearer the mark.