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Had a quick look last night - when the hot tap goes on, the burner fires up nearly instantly, and carries on running after the hot tap goes off (to replenish the heat bank I guess). Didn't get a chance to try with the bath tap, but the tap in the utility room would get cooler as it kept...

OK - thanks. Will have a look later on and report back :)

Thanks for the suggestions. How can you tell which way the diverter is passing? The heat bank seems to fill up OK from cold, it'll fire when you turn the hot tap on, but then it goes cold after a bit. Leave it for a few mins and it'll run hot (for a bit) again. Should the flow drop off as...

The boiler fires when you turn the hot tap on (assuming it's in it's 'on' period) - however it's like the boiler can't keep up with demand for hot water, so after a while it goes cold - which suggests to me that something isn't right somewhere, as the flow isn't that high. It'll run a shower...

Hi, We've got a 20 year old or so Worcester Heatslave 15/19 non condensing oil fired boiler, however the internal battery in the programmer is packing up - the shortest power dip now causes the clock to reset, so the blooming thing needs reprogramming. As the installer helpfully installed it...