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I have a conventional open vented pumped CH and gravity circulation indirect DHW system. Lately the hot water has been taking longer to get warm and seldom gets really hot in quantity, although I have turned up the boiler thermostat. The flow pipe from the boiler to the cylinder is really hot...

Conventional (at least it was 25 years ago) pumped CH and gravity DHW system with F&E tank in loft (two storey house), cylinder on first floor and boiler on ground floor (25 year old Glow-Worm, very reliable), immediately below the cylinder, so very short vertical feed to cylinder. I drained the...