MODULE IV
Condensing boiler technology Page 28

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In contrast to conventional gas heating systems condensing boiler systems work with significantly lower temperatures. As a result:

Prior to their use these materials have to be examined and have to be approved with a test seal and test report by the IfBt (Institute for Construction Technique). So far the following materials fulfil those special requirements: Aluminium, polyvinylidenflorid (PVDF), polypropylene (PPS), rustproof steel, borsilicum glas and refractory/fire clay.

The following table gives an overview over the areas of use of the different materials:


Material Temperature categories Exhaust gas temperature limiter
A
< =
80C
B
< =
120C
C
< =
160C
Aluminium
-
-
X
no
Polyvinylidenflorid (PVDF)
X
-
-
yes
Polypropylene (PPS)
-
X
-
yes
Rustproof steel
-
-
X
no
Borsilicum glas
-
-
X
no
Refractory/fire clay
-
-
X
no



 


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