Good morning,
According to the district chimney sweep, modern condensing boilers may not be operated in this way; he would not approve them like that.
Correct.
Old gas boilers, for which there is this exemption for external wall installation, are no longer manufactured, says my heating engineer and another specialist company.
That is also true.
Fireplaces on the exterior wall are not approved because, due to the terrace construction style of the houses, they would have to be incredibly high (my apartment is the lowest of 4 apartments), says the building authority.
You bought the apartment without expert accompaniment?
Can someone give me advice?
The possible option has already been shown to you by . If the clear room height allows a floor heating system, this can also be installed with the replacement of the heat generator. Otherwise, install low-temperature radiators and connect them to an air/water heat pump (air-water heat pump).
The exciting question is therefore: when was the apartment building constructed? Is the shell well insulated?
Best regards from the Rhineland