I have a Worcester 15/19 Heatslave oil combi boiler with a twin channel programmer. We have 5 bar water pressure. The central heating is off for the summer. Recently, we have been having trouble getting consistent hot water, even with the Control Thermostat set to maximum and the heating period set to "on" constant. The boiler fires up normally when a hot tap or shower valve is opened. Sometimes the water gets scalding hot for a few moments, but then drops back to lukewarm. It can then be a long while before it gets hot again. However, the flow pipe from the boiler always seems very hot.
Any ideas? Many thanks! David
Any ideas? Many thanks! David