I've a Worcester 4.5 combi boiler for both hot water and central heating. The boiler settings are 'On' for hot water (= on all the time for on-demand supply); 'Twice' for central heating (= on for a couple of hours in the morning and in the evening). Recently I've noticed that the radiators are warm during the period when the central heating is off - and I don't mean just after it's gone off i.e. latent heat from the 'on' period. When this occurs I've checked that the central heating setting is indeed 'off' at the boiler. The radiators each have their own thermostat - all of which are at the middle setting. The boiler is serviced annually.
I would have expected the radiators to be cold during their 'off' period so this behaviour seems odd - do I have a problem ? If so what is it likely to be?
Thanks
I would have expected the radiators to be cold during their 'off' period so this behaviour seems odd - do I have a problem ? If so what is it likely to be?
Thanks