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Open Vented Heating and Hot water system with 2 port valvs, 12 Radiators, are just warm and immersion tank takes ages to get hot. Boiler has just replaced last week but problam is still there. Pump has also been replaced. New boiler is Vaillant 418. when the boiler runs in low flame then...

I came across to a job where the customer complaining that the shower and pump (salmander) has been newly installed by another plumber and giving troubles since it has been installed. When i check that it was working into negative head mode. but it is in the position of positive head. How can...