I have a Vailliant 418 with weather compensation and have always had a problem with it cycling. Although via certain user adjustable settings and ensuring I have an adequate water flow on occasion I still have problems.
Just for interest I decided to try a different approach. My logic for thinking this might be a viable option is that a condensing boiler likes to run cool (output) and also they are most efficient on low output (modulated down). Both of these should lead the boiler to running efficiently.
So what I have done it down rated the output to 5kw and just let the boiler heat the house slowly. It seems to take about 2hrs to reach room temperature. I need to ensure the output will heat the house which it does. The question is why can't I just let it reach temperature quickly and modulate down. I can but it on occasion it goes over temperature and can get in a cycling mode which drives me mad.
The question is is there a reason not to do what I have tried?
Gary
Just for interest I decided to try a different approach. My logic for thinking this might be a viable option is that a condensing boiler likes to run cool (output) and also they are most efficient on low output (modulated down). Both of these should lead the boiler to running efficiently.
So what I have done it down rated the output to 5kw and just let the boiler heat the house slowly. It seems to take about 2hrs to reach room temperature. I need to ensure the output will heat the house which it does. The question is why can't I just let it reach temperature quickly and modulate down. I can but it on occasion it goes over temperature and can get in a cycling mode which drives me mad.
The question is is there a reason not to do what I have tried?
Gary