RMH as replacement for oil boiler

Hello all; my first post here ,my question is how the performance of a rocket stove might compare with that of a condenser oil boiler.I live in Ireland and looked at the costs involved for a condenser boiler(promoted by grants available for from SEAI) for my mothers home and in no way whatsoever were they affordable.
Would anyone here have seen any videos or perhaps links where rocket stoves were use to provide domestic hot water space heating in a home as a replacement for a traditional oil based system.The one we have at the minute is the Stanley range type which provides heat to radiators and hot water when on, the fuel costs too much (cold winter) and is getting less practical by the day.Apologies if the answer may be on the forum already, i have just now joined and was advised to post by someone involved with the site.(Sent message on youtube).
Thanks in advance to anyone taking the time to answer this.