I am currently the lucky owner of an Ideal Icos connected to a sealed S-plan system with an unvented HW cylinder. Whilst it has never really given us any trouble I am acutely aware that by all accounts I am actually playing a slow-motion game of Russian roulette and it is only a matter of time to learn the irony of the manufacturer's name...
So, I've decided to research now what boiler to ultimately replace it with as I can see the benefit of doing so whilst not under duress. To that end I'm currently settling on the Viessmann 100-W Compact as by many accounts it (the newer WB1B model?) seems a fairly acceptable boiler. My personal interest stems from its simplicity by virtue of being a heat-only boiler with fewer internal parts to go wrong, it being as close to a drop-in replacement as one could hope for, support for weather compensation, and reasonably low minimum modulation output.
Looking at the installation instructions, which are by far and away the most scant that I have come across, it would appear that there is no requirement for pump overrun given that the pump connection seems entirely optional (pg 13 refers). Can anyone confirm that this is correct? Does it achieve its heat dissipation during overrun using the fan (as per the Icos) or does it simply not have such a dissipation requirement in the first place?
Any other comments from 'those in the know' on my current choice would be most welcome.
Mathew
So, I've decided to research now what boiler to ultimately replace it with as I can see the benefit of doing so whilst not under duress. To that end I'm currently settling on the Viessmann 100-W Compact as by many accounts it (the newer WB1B model?) seems a fairly acceptable boiler. My personal interest stems from its simplicity by virtue of being a heat-only boiler with fewer internal parts to go wrong, it being as close to a drop-in replacement as one could hope for, support for weather compensation, and reasonably low minimum modulation output.
Looking at the installation instructions, which are by far and away the most scant that I have come across, it would appear that there is no requirement for pump overrun given that the pump connection seems entirely optional (pg 13 refers). Can anyone confirm that this is correct? Does it achieve its heat dissipation during overrun using the fan (as per the Icos) or does it simply not have such a dissipation requirement in the first place?
Any other comments from 'those in the know' on my current choice would be most welcome.
Mathew