I have a Vaillant Ecotec 938 plus, which is a 38kw boiler. It appears to be grossly oversized for the property. Total radiator wattage is 20.2kw at delta T50. If I leave the heating partial load on auto, it goes into anti-cycling mode all the time and also my gas usage is completely off the charts.
I have a total of 11 radiators, of which two are towel radiators. Of these eleven radiators, two are switched on to anti-frost level permanently, as one is a dressing room which gets warm enough from the ambient air coming in and the other is a guest bedroom that rarely gets used. Some of the other rooms only get used at certain times of the day when other rooms are not in use.
So all in all, I usually have an absolute maximum of 7 radiators on and calling for heat at the same time, including the two towel radiators. This gives a typical maximum of 12.5kw used at any given time (unless of course the heating has been off for several days and the whole house needs to be heated, in which case it's likely to approach the maximum 20.2kw) as they get all the rooms up to temperature.
What recommendation do you experts have for where I should be setting my heating partial load? At 20kw - 22kw for the maximum possible use, or at about 13kw - 15kw for my typical maximum use?
I'd like to avoid the constant anti-cycling as it causes the heating flow temperature to cool down considerably (by about 10 degrees or more) before the boiler cycles back on and also reduce my astronomical gas bill.
I have a total of 11 radiators, of which two are towel radiators. Of these eleven radiators, two are switched on to anti-frost level permanently, as one is a dressing room which gets warm enough from the ambient air coming in and the other is a guest bedroom that rarely gets used. Some of the other rooms only get used at certain times of the day when other rooms are not in use.
So all in all, I usually have an absolute maximum of 7 radiators on and calling for heat at the same time, including the two towel radiators. This gives a typical maximum of 12.5kw used at any given time (unless of course the heating has been off for several days and the whole house needs to be heated, in which case it's likely to approach the maximum 20.2kw) as they get all the rooms up to temperature.
What recommendation do you experts have for where I should be setting my heating partial load? At 20kw - 22kw for the maximum possible use, or at about 13kw - 15kw for my typical maximum use?
I'd like to avoid the constant anti-cycling as it causes the heating flow temperature to cool down considerably (by about 10 degrees or more) before the boiler cycles back on and also reduce my astronomical gas bill.
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