Can anyone explain what the effects/drawbacks are of setting the central heating pump to 1, 2, or 3? I've had to use the highest setting to get rid of airlocks after draining, and was wondering why the 'normal' setting is 2, rather than 1, or even 3.
pump speeds
- Thread starter Gavin0268
- Start date
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It is to do with water displacement (I hope that is the correct word) in an installation. In a nutshell, I would be looking for a 11 degree C differential at a given pump speed. If speed one does not give me that, then it is 2 or even three. If three fails, go for a bigger pump.
The 11 C differential isn't that critical. Modern systems are designed with a 20 C differential, which results in slightly lower output from the radiators (about 10% less), but this is unlikely to be critical, except possible in extremely cold weather. I would say that anything between 10 and 20 C differential (measured when boiler is on full flame) was in the right order.
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