Why maintenance is worth it
A maintained system runs quieter, heats more evenly and is far less likely to fail in the middle of a cold snap - which is exactly when engineers are busiest and parts are hardest to get hold of.
It also protects the appliance itself. Sludge and debris circulating through a heating system wear out pumps and block heat exchangers, and those are the expensive failures. Keeping the water clean and the pressure right is the cheapest heating work you will ever pay for.

