II The factor for weighting the heat output of preferential and supple
mentary heaters of a package as set out in the following table.
III The value of the mathematical expression: 294/(11 · Prated),
whereby ‘Prated’ is related to the preferential space heater.
IV The value of the mathematical expression 115/(11 · Prated),
whereby ‘Prated’ is related to the preferential space heater.
Tab.13 Weighting of boilers
Psup / (Prated + Psup)
(1)(2)
II, package without hot water storage tank II, package with hot water storage tank
0 0 0
0.1 0.3 0.37
0.2 0.55 0.70
0.3 0.75 0.85
0.4 0.85 0.94
0.5 0.95 0.98
0.6 0.98 1.00
≥ 0.7 1.00 1.00
(1) The intermediate values are calculated by linear interpolation between the two adjacent values.
(2) Prated is related to the preferential space heater or combination heater.
Tab.14 Package efficiency
Baxi Combi 224 228 424 428
Temperature control X %
Temperature control Y %
13 Appendix
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