Condensing boiler technology Page 17

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5. Condensing boiler technology based heating systems

Learning objective 3

Condensing boilers work in relatively low temperature ranges. The ideal working range for condensing boilers are forerun/reverse running temperatures of 40C/30C. So, the temperature spread is 10K.
But also heating systems with temperature ranges of 75C/60C or 55C/40C use the advantages of condensing boiler technology.
The diagram below shows the temperature curves as a function of the outside temperature for a heating system with 75C/60C:

  • Explain this diagram.
  • Explain why the reverse running temperature should maximally be 60C.
  • Explain in which way the diagram is changing with a system temperature of 55C/40C and what effects that will have on the heating system.


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