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If the appliance is installed where the temporary hardness of the water is high, say over 150 ppm (as defined by BS 7593 1993 Table 2), the fitting of an in line scale inhibitor is required. This must be comply with the requirements of the local water company.
The gas consumption should be as below within a tolerance of 5%. If the reading is outside of this range then, with the use of a flue gas analyser, refer to gas valve adjustment in chapter 7. Gas Consumption 24CPM 30CPM Unit Natural Gas (max load) 2.38 2.92...
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