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Can anyone help, at wits end with fluctuating DHW temp. Turn on a HW tap, get variable temp, lukewarm to warm, never 55 deg C as set, HW temp approx 30 deg C. Looking at boiler (Vaillant combi 828/2E Ecomax) display when HW tap turned on, looks like burner kicks in for a few secs, HW outlet...

After installation of new kitchen, hot water no longer as hot as it used to be. The only plumbing changes during kitchen installation, were new main stopcock and extension of HW and CW pipes (by about 15 inches) to new mixer tap for sink. After investigation of boiler (Vaillant combi condenser...