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Originally Posted by Ronald Fraser
Is there a workaround that would enable me to pressurise my Combi to 1bar when the mains water pressure is only 0.75bar ?
The combi is working and when heating the pressure rises to 0.9bar.
I am concerned that the combi should be operating at the recommended pressure.
Some have suggested attaching a 1.5bar shower pump ( with attached water tank). Is there an alternative e.g. water pump that would serve to bring the combi up to 1bar purely for commissioning purposes.
There is adequate DHW water flow.
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When the system is cold let the air out of the expansion vessl by opening the schraeder valve (like a car tyre valve). Then open up the filling loop to fill the system up to 0.75 bar. Now shut that, get your bike pump out and pump the air back into the expansion vessel whilst watching the pressure guage, stop at 1.5 bar, hey presto!