Erik_IEU schrieb:
... By using exhaust heat, condensing boilers achieve about 10% higher heating output from the same amount of fuel compared to conventional boilers. But this only applies if the design of the heating surfaces allows for appropriate supply and return temperatures. In domestic hot water production, condensing operation is usually not possible at all. Erik_IEU schrieb:
... Modulation means that modern condensing units can operate within a range, for example from 3 to 17 kW. There are already units that achieve a modulation ratio of 1:10. Erik_IEU schrieb:
... Studies have shown that simply by replacing old units with modern gas condensing boilers, heating costs can be reduced by around 30% potentially, .. That’s somewhat optimistic. 😉 The theoretically maximum possible benefit from condensation is about 11%. Considering domestic hot water production, around 7 to 8% might realistically be achievable. Where do the remaining 22 to 23% savings come from then? 😉 Also, general statements about savings effects are very questionable, as the starting point is always the existing condition of the system in question.
If the starting condition is already relatively good, only little additional improvement can be achieved.
Best regards.
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