Markings 'W M H' on central heating pump

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I have the markings 'WMH' on my central heating pump. Currently set to 'W'...anyone know what they mean? :idea:
 
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Not on the pump, but on the mid position valve they mean water - mid position - heating.
 
Nice bit of mind reading there i missed that will havetodust off the crystal ball.

These would make good acs questions about the same mentality.

Every five years it behoves us to get our minds out of their higher state and train them to think like a complete idiot so we can imagine for thelife of us what the questions are about.
 
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Nice bit of mind reading there i missed that will havetodust off the crystal ball.

These would make good acs questions about the same mentality.

Every five years it behoves us to get our minds out of their higher state and train them to think like a complete idiot so we can imagine for thelife of us what the questions are about.

I'm not quite sure why my question prompted such a reply, but i guess there are always some who take objection.

Thanks to all the others who answered the question and pardon my mistake about it being a valve and not a pump! :rolleyes:
 

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