the 100w is for europe. the old 100 (dover) boiler was just for the uk market.difference between the 100 and 200 is the interface the 200 has a lambda sensor that can automatically detect the fule given. e.g no need for lpg conversion.also the weather comp and additional controls are more sophisticated, as to been given more options.but generally the new 100w is just a baby version and a very good boiler.
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