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Megaflow everytime, just take into account when renewing the cylinder, your main water pressure and also flow rates, as too low of either will make a great system rubbish, as a guess, a 22mm cold water main, with 30 litres per minute and 3 bar, but then check manufacturers recommendation, use a...

If there are no underlying problems with the Boiler stat etc, it can only be circulation or electrical. Curculation is not an necessary an airlock or blockage. The circulation problem may be caused by a lazy hot water stat on the cylinder causing the temperature of the water to become tepid...