The church that I am a member of, replaced on old boiler 18 month ago with a Vitodens 100 19kw Open Vent boiler.
The original boiler worked fine, apart from the pilot blowing out on occasions and spare parts becomming almost impossible to get. However, the church was always warm, even during the coldest winter.
Since the new boiler was installed we have never had the church as hot as it previously was, and during the winter people have to keep their coats on.
When the heating engineer installed the boiler, he flushed all of the system and fitted a "Magnaclean".
The heating engineer has attended several times to try and fix the problem, and he has had an engineer from Viessman out twice look at the system.
The Viessman engineer said that the system must be sludged up, even though it has been all flushed out once already. The next time he pronounced the pumb defective. The pump had been replaced two years previously, but to show good faith I replaced it with a new Grundfos pump and the problem is the same.
All along I have suggested that the boiler wasn't reaching a high enough temperature. It is only supplying water for the radiators and all of the radiators warm up quite quickly to the same temperature, but don't get hot.
Both engineers said to turn the temperature dial right up, past the higest setting, almost to the reset possition. Even doing that hasn't made any discernable difference. The display readout reaches about 68deg and sometimes flashes to 70deg.
I noticed on another thread someone saying they increased the boiler temperature to overcome a similar problem. Does anyone know if this is possible and how?
In another part of the church complex we have a Baxi Combi 80 which performs brilliantly and we have to turm the rad valves down, because it gets too hot. I'm beginning to wish we hadn't been persuaded to fit a Viessman for the main building.
Any help would be appreciated.
The original boiler worked fine, apart from the pilot blowing out on occasions and spare parts becomming almost impossible to get. However, the church was always warm, even during the coldest winter.
Since the new boiler was installed we have never had the church as hot as it previously was, and during the winter people have to keep their coats on.
When the heating engineer installed the boiler, he flushed all of the system and fitted a "Magnaclean".
The heating engineer has attended several times to try and fix the problem, and he has had an engineer from Viessman out twice look at the system.
The Viessman engineer said that the system must be sludged up, even though it has been all flushed out once already. The next time he pronounced the pumb defective. The pump had been replaced two years previously, but to show good faith I replaced it with a new Grundfos pump and the problem is the same.
All along I have suggested that the boiler wasn't reaching a high enough temperature. It is only supplying water for the radiators and all of the radiators warm up quite quickly to the same temperature, but don't get hot.
Both engineers said to turn the temperature dial right up, past the higest setting, almost to the reset possition. Even doing that hasn't made any discernable difference. The display readout reaches about 68deg and sometimes flashes to 70deg.
I noticed on another thread someone saying they increased the boiler temperature to overcome a similar problem. Does anyone know if this is possible and how?
In another part of the church complex we have a Baxi Combi 80 which performs brilliantly and we have to turm the rad valves down, because it gets too hot. I'm beginning to wish we hadn't been persuaded to fit a Viessman for the main building.
Any help would be appreciated.