What is the number dial on the front of my boiler for?

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31 May 2005
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2,191
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Alfreton,Derbyshire
Hi all, I've never had gas central heating and don't have a manual for the system

It's really probably a simple question. On the front of our traditional gas boiler (not combi) there is a grey dial with numbers on 0,1,2,3,4,5,MAX I'm guessing it's something to do with how hot the water gets to in the upstairs hotwater tank? I'm prosuming it's only for the hot water temp as we have a thermostat for the rads. Does that make sense? If so do I just adjust it to the required temp or is it something to do with the quantity of hot water there will be?

Sorry for being a noob on this but any advice appreciated

Thanks!
 
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