I use my VBM only 2 to 3 times a day and notice that the group-head temperature seems to stabilise at greatly varying temperatures, sometimes barely hot sometimes boiling. I installed a Eric Svendson digitherm to see what was going on and indeed it shows a huge variation. BTW, this is a real nifty device, see the pic. The boiler pressure oscillates nicely around 1 bar so it would seem the pressurestat is OK. Im going to give it a good descale, as soon as I get some descaler. Any other ideas?



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