Massed ranks of gas central heating boilers, serving as mini CHP plants, are being recruited in the battle against global warming as Roger Dettmer discovers. GAS CENTRAL heating -enjoyed by some 20 million UK homes - is one of the great conveniences of modern life. Like most conveniences, however, it's something we tend to take for granted. Timers and thermostats turn it on and off as required, and an annual maintenance visit, hopefully, keeps it going. All the home owner has to do is pay the bills and enjoy the benefits. We can be obsessive about the make of car we drive, the features of our new HDTV, but it's a rare individual who has the remotest interest in the gas boiler heating their home. All this could be about to change.
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