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>We don't have an all day requirement for DHW during the working week, just at the weekend.< Do you have a 5+2 programmer with separate CH and DHW schedules? > Is it normal behaviour for a system boiler to only do rads or DHW and not both at the same time?< Yes, if the piping/valve are setup...

Do you know if the installer setup hot-water priority? A call for HW should fire the burner at full kWH rating and the flow temp should be 70°C+ to reduce chance of bacteria growth in the cylinder. HW being fed using a Y-plan or S-plan design with the boiler range-rated down for CH isn't good...

>About a month ago we have been noticing especially first thing in the morning when we turn on the hot water quite a loud humming sound< From the video looks like an unvented system with a heat-only boiler feeding a hot water tank for domestic HW. I see a diverter valve so if the 'humming'...

Consider getting a triple panel (K3) radiator to improve heating the room while setting the C/H flow temp lower

Yes.

>this all started a couple of years ago when one radiator just completely stopped heating despite no messing with balancing, having the valves fully open, bleeding it and taking it off and forcing water through. < The system maybe has problems with blockages of sediment. Was the water you...

The Urban Plumber has a useful video on how to setup a hot water priority system where the boiler runs water at maximum output to heat water in the cylinder, but will operate the central heating at a lower flow temp with OpenTherm & weather compensation for efficiency.

I have a suspicion it'll come out they were fleeing from the bizzies

I'm more concerned about - 1) The additional taxation placed on sales of gas, electricity and petrol which makes up a large percentage of the price 2) What must be a broken market, where excess profits can be made by a few suppliers. Anti-trust investigation needed 3) A regulator, Ofgem, which...

On many Worcester combis, a competent person can use service menu option 1.A to reduce the max heating output. In smaller properties, this can reduce the return temp to maximise condensing mode operation and also reduce burner cycling,