Water Filters are not a fad or a way for engineers to bump up the cost of repairs and servicing.
Unless your home is a new build or has been totally re piped there will be residual contaminants and sludge in your system if water health has not been maintained. A new boiler does not mean clean water, and particles and sludge can still damage a new boiler. Statistics have shown that 60% of new boiler breakdowns within the first twelve months are due to contaminated water.
British standards recommend a yearly check for lack of protective inhibitor, excessive acid or alkaline levels, and corrosion. A magnetic water filter is a good idea to maintain the health of your boiler and your heating system