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And the baxi duo-tec combi 28 he was also awarded a 'best buy' by which? in 2007 achieving the top score. During winter, we’re looking at just 10 – 20% it may not sound like a lot but at the end of the day, it’s 20% off your energy bills, so you can’t really complain. However, only about half of drainlayers are self-employed others work for small to.