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Hi all, i've just recently passed my ccn1 and specialist subjects so go easy on me for my lack of experience, gas rated a vaillant turbomax 242e today for my mother (free of charge i might add, ahh) it took 42 seconds for one complete revolution of the dial so 3600x1042/42 gives me 89,142btu = 26.1 kw. Now the data table says 29.3 kw max (dhw) i know there is a tolerence of +/- 5% so its not right, What should i do ? I know some of you will be saying "you've passed your ccn1 you should know what to do" but i'm confused whether i've calculated it wrong I.E. gross or net. Thanks for reading.