i have a spare combi boiler, which i was thinking of blanking the central heating ends and using it to supply lovely hot water in my garage. however although i have water and electricity, i dont have gas in there. if it possible to run a combi boiler for the odd bit of hot water from bottled gas?
You will need at least one radiator or some sort of heat sink, as firstly you will have top pressurise the boiler otherwise it wont work and you need somewhere for the excess heat to go when the hot tap is turned off - normally a radiator.
As for the gas side - yes it would work as this is what is used in caravans etc - you will need an LPG conversion kit for the boiler - but it's not a DIY job you need an RGI with LPG tickets.
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