The simple answer is yes bearing in mind that you will need a gas supply to your property, without seeing your current set up I’d also consider the cost of installing new pipework and radiators in your property at the same time as converting to a gas boiler
Hope this has helped
Hi yes of course you can, small house simple Combi boiler will work for you,
But the obvious do you have gas in to the building, if not you may have to pay a sum of money to have a gas supply installed to your property.