Radiators can leak from their valves, from the valve connection into the radiator, from the blanking or vent plugs at the top, or simply through the steel when they corrode. If you have a leaking radiator the first thing to do is to try to catch the water with a tray - or at least to put a towel under it. Next turn off the valve at the other end - the 'lockshield' valve. This is usually not quite so easy as it may well have a plastic cap that will need to be unscrewed or (firmly) lifted off. A spanner or pliers will often be required to turn the valve - again clockwise.
Parts may be no longer available (although we are often able to obtain parts that others cannot); the boiler may become too expensive to maintain or it may become inefficient to run. So boilers eventually wear out and need to be replaced. But always bear in mind that we are particularly good at finding parts for old boilers, and have been around long enough (perhaps a sign of Matthews age!) to be experienced with older boiler and system problems. So, we'll always repair instead of replacing if it makes sense.
For the last few years, all new boilers have been high efficiency condensing boilers. These are much more efficient - but only if they are set up correctly. We often find that they need adjusting during a service both to ensure that they continue to run, but also to get the maximum efficiency. And, with gas costing more and more, this has become very important. The other vital action during a condensing boiler service, is to check the condensate trap is clear. If this fills with debris, the boiler may either stop working - or flood.
Our wc's fail, our tap washers wear out, pipes leak and bathrooms and kitchens need replacing.