"John Stumbles" wrote in message
...
On Fri, 22 Jun 2007 18:46:56 +0000, ARWadsworth wrote:

Is that boost button only there so that the person testing the gas
supply can test it properly?

Yes, they make the boiler deliver full output without modulating down so
you can check the gas rate and inlet pressure etc.


So there is no reason for a user of such a boiler to press the button then?

Adam