Beware they produce water as a by-product. I used to have a calor heater in the garage and went to electric as when I used it everything got covered with condensation.
refillable as bottle from the UK and EU market leader in self refillable gas bottle and gas tank solutions GAS IT Refillable Gas bottles, Refillable Gas tanks Gas bottle, alugas and Leisure Gas Tanks Solutions & gas Products for Motorhome's, campervan's Caravan's, Catering, Farrier, Forge and...
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One supplier of the bottles although there are others..