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Grant Vortex pressure dropping?

I have a Grant Vortex boiler powering underfloor CH, Rads + hot water. I have to repressurise the boiler every 2 days or so (to 2BAR) as it drops to under 1 Bar. What could be the problem?
Also, is it normal for it to produce lots if steam when it is going?

GrahamS
December 2009
GrantGrant VortexHeating, Home Heating SystemsBoiler Rads Hot

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Grant Vortex Boiler Losing Pressure - Causes & Steam