Question, why do you think a combi boiler would be suitable for you? Has anyone checked your water pressure and flow rates. How many live in the house, is their a constant demand for hot water, what and how old is your current system. These are the types of questions your installer should be asking you.
Common error, all modern boilers are condensing whether they are combination, heat only or system. As mentioned the best system efficiency wise, is based on type of dwelling, householders, lifestyle and other factors which are checked at the survey stage. Your installer will be able to advise properly.
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