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Approx 0.071kWh which at about 10p per kWh = approx 0.7p

We had a similar issue with our new Vaillant boiler which was a direct replacement for an older boiler which developed a leak in the heat exchanger. We also have a Gledhill tank. The noise was so bad I could feel it in the pipes and also on the boiler case. I was reluctant to leave the house...

Brown water from hot taps could be related to the expansion vessel if a pressurised system. Check if water comes out of the air top up valve.

That's interesting, Ian, does that mean it can be upset by gusts of wind hitting it head on?

There is only UFH. The noise is the same when only the tank is being heated without the UFH being on. Is it a coincidence that it has done this a few times today, the first day with blustery wind hitting the gable where the balanced flue exits?

Can anyone identify the source of an intermittent loud droning noise from our Vaillant EcoTec Plus 612 boiler? Vaillant’s engineer came out but it didn’t happen that day! He did check the boiler through and found no faults. Before I ask a local repair man to have a look, I wonder if any of you...

Put a pan of icy cold water onto the gas flame - you're likely to see condensation on the outside of the pan until it warms up. As said, it comes from the gas combustion.

The formula I wrote works in my PC. I can't see why your computer should be different. Try copying it and pasting it into your worksheet: =((J20-J19)*1.02264*39/3.6*P19/100)+((DATEDIF(K19,K20,"d"))*P20/100)

How about: =((J20-J19)*1.02264*39/3.6*P19/100)+((DATEDIF(K19,K20,"d"))*P20/100) Note that I've removed some of the brackets...

Your caliper gauge is being used wrongly and giving you the wrong reading. Put the thing you're measuring between the 2 parallel jaws ( facing down in your photo) which will measure the diameter .... assuming the jaws reach the middle ie diameter of the " plug".

Would you not be wiser to explain why he has the "wrong end of the stick" - you are asking for people's help after all.

Thanks for correcting me - I was still half asleep!

Watt is a unit of power. 747,000 Watts (747kW) is one Horse Power. To write "watt/hour" is like writing "Horse Power per hour". That has no meaning. 1Kw of power used over 1 hour will take 1kWh of energy.

Why should Schrader valve be at the top?

Thanks for your suggestion. Yes, I can fire up the boiler and listen to the valves - they are all close together. Unfortunately, I struggle to tell where the noise is coming from. I tried listening though a screwdriver against the valve bodies, against the pipes, even against the boiler...

Thank you for you reply. No, there is no external automatic bypass. I was suspicious of this 10 years ago but our plumber assured me that Vaillant's internal one was adequate and if there were 2 bypasses, "they would fight one another....." Your experience tells you that's not going to happen -...

We had a new Vaillant EcoTec Plus 612 system boiler installed in February. Occasionally, about once per week, we have experienced a very loud droning resonance in the pipework. This is savage enough to be heard through the house and felt on the pipes and boiler casing. It appears to be caused...

I don't think it started suddenly - I had suspicions for a couple of weeks that something had changed in the water colour - how long that had been going on is impossible to guess. After I noticed it, the effect was consistent, ie not re-occurring. Initially, I assumed the water supply had...

Yes, I eventually found a stainless steel one which cost a bomb........ No problems since then.