Boy racer's need not apply

摘要

Just imagine. You have spent £20,000 on an up-market car. Latest everything in gizmos and specification. You get in, put your foot flat down until you come to a red light. You screech to a stop and turn off the engine - then start the car again and floor the throttle until you stop again, and so on. Apart from the risks and the points you will collect on your licence, the effect on mpg. would be disastrous. In reality, second by second, you vary your speed to suit the conditions and to minimise your fuel use. So if we drive carefully and economically, why do we treat boilers, especially condensing boilers, as road racers? Now the analogy is not quite right since some boilers have modulating controls so that we only put our foot halfway down after a while, but its still a pretty crude way to control the boiler.