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It's quite common to see and not specific to a Glow Worm boiler. It comes down to the method chosen by whoever wired the system up. You don't give the model or type of boiler and there are many variants, so I'm guessing yours is a 'heat only' boiler and it has a connected hot water cylinder.
In which case, the live is the important pump connection as it is switched 'on' and 'off' by the boiler. And as you suspect, the Neutral can be picked up from another convenient point. So for example, if the pump is located near the motorised valve/s the same neutral can be used for both. Meaning there's no need to run a second neutral wire when there's one associated with the heating system already conveniently there.
If the pump is working it will have a neutral connection.
In which case, the live is the important pump connection as it is switched 'on' and 'off' by the boiler. And as you suspect, the Neutral can be picked up from another convenient point. So for example, if the pump is located near the motorised valve/s the same neutral can be used for both. Meaning there's no need to run a second neutral wire when there's one associated with the heating system already conveniently there.
If the pump is working it will have a neutral connection.
Last edited:
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