In any case condensing boiler is required.
The cheapest (and quickest) option will be to replace what you have with similar - presume the HW tank is gravity rather than pressurised. If the system is not fully pumped, then this will need to be added, but that's not too hard. Condensate drain might be a challenge depending on where the boiler is.
Changing to a combi might be a cheaper than changing the cylinder for a HP one ,but that will depend on the relative locations, gas pipe size etc. As noted a Combi wants to be at least 36kW and preferably more, and may need a 28mm gas pipe all the way from the meter. If location of the combi does not have hot / cold water and heating connections then you are looking at a reconfigure that may add significant cost / time. Need to get a man that knows in to review and advise.
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Boiler Woes new
Boiler Woes new
