@jamespa So the idea was to turn down the LSV in this one room, to reduce flow rate, and see if the ringing is from water/copper friction of high flow rate.

I turned it down about 3 quarter turns, the room was noticably colder last night than the night before. As for the noise, I think it was a little quieter, but I have no instruments to measure it, and my ears are in a such a state I can't really tell what's coming from where.

I still woke up with a mild ear pain. I'll turn the LSV back to what it was to see if it really makes a difference.

Some of the engineers suggested the issue may be related to the mains water supply. So when it warms up a little (so that the HP doesn't ice up), I'll turn off the mains water and see how it sounds. 

The only thing I can be sure of at this point is that when I work in the local library I don't have all these issues, so the issue is definitely in the house, not some ear condition.

Posted by: @jamespa

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I would focus on the original source of the noise which I thought you said was the pump.  Is it?

So did I. I thought the vibrations were passing through the circulation pump into the pipes, but this resonance thing seems to happen (to a lesser extent) even when the pump is off.

It's also very subtle, the engineers who came were saying they couldn't hear it. Even I can barely hear it, but the problem is that when it's all quiet at night it makes it very hard to sleep, and when I'm in my study for a couple of hours, my ear starts to hurt really badly, and then hurts for hours after leaving the study.

Octopus replaced my old pump :

With a smaller one like this:

They even put in some kind of rubber bracket to reduce the vibration.
I thought it made a difference, but maybe it was a placebo effect, cos it's now noisy again.

I am at a loss, I don't know where to look for the source of the noise. 

Posted by: @razz

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So did I. I thought the vibrations were passing through the circulation pump into the pipes, but this resonance thing seems to happen (to a lesser extent) even when the pump is off.

Does it disappear when the heat pump is off?  What about when the fan and water pump on the heat pump are running, but not the compressor(which will happen at times during cycling).

Are you absolutely sure it's the heat pump.  Sorry to ask!  Once one becomes tuned into noises they can become more obvious than they were previously.  I didn't hear my dishwasher at night until I got a heat pump, then, presumably because I was listening for noise in the early days, I started to hear it!  Weird psychology I know, but nevertheless the case.  I live in a fairly quiet area but still at night there is, depending on wind direction, a low pitched hum from somewhere, possibly just distant road noise filtered by the fabric.  I'm more conscious of that than I was pretty heat pump!

Hey all, been a while. So the Octopus poeple didn't find any problem, and I ended up just paying up as I didn't want to pursue some kind of dispute through a regulator. I still have the noise issues, but as far as I can tell, the majority of it is from the neighbours. 

One one side, there's a loud, 26 year old boiler, and on the other side, the neighbours are finishing up a loft and rear extension. I think think they've installed something, possible their large america style fridge, which intermittently causes a buzz. 

I've had a plumber inspect my pipes, and install a water hammer arrestor (which hasn't full stopped the water hammer) etc. Next I'll have to try to see if the neighbour with the extension will let me poke around theirs. 

So all in all, still living in a very shitty situation.

Posted by: @razz

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Hey all, been a while. So the Octopus poeple didn't find any problem, and I ended up just paying up as I didn't want to pursue some kind of dispute through a regulator. I still have the noise issues, but as far as I can tell, the majority of it is from the neighbours. 

One one side, there's a loud, 26 year old boiler, and on the other side, the neighbours are finishing up a loft and rear extension. I think think they've installed something, possible their large america style fridge, which intermittently causes a buzz.....

So all in all, still living in a very shitty situation.

 

 

Really sorry to hear that although I must confess to being faintly amused that the prime source of noise turns out to be the neighbours' gas boiler and a fridge, given that this is  in a discussion about noisy heat pumps and with the view still put about that heat pumps are noisy.  Perhaps you should suggest that your neighbour with a boiler gets a heat pump in order that he stops disturbing you with noise!

My neighbours objected to my planning application for a heat pump on noise grounds.  Eventually permission was granted and they told me 6 months after it was installed (the six months covering November-May) that they didn't even know I had it.  In the mean time I have to put up with a constant high pitched whine from their swimming pool circulator pump all through the spring and summer.  

Hi all, Yes i went quiet a while back as was given hush mode to test after my noise problems, but was asked not to mention anywhere. As it’s now released to the wide world I can say what I found during testing. As you all know my neighbours 50m away could hear my pump, my wife hated me as she couldn’t sleep. Lots of complaints flying around. TJ was brilliant i had the NI team tech over, who i add totally agreed how bad my system was noise wise, they came back with hush mode! My noise stopped totally, it was less than 40db next to the unit. Now people would say but you’ve lost the performance! In my case no, March we had some sub zero’s outside i had an efficient 20 degrees inside, ( i never tried going higher as 20 was more than enough for all of us). My bills dropped dramatically. My cop was around 4.5. Water was hot after they sorted where in the tank the thermostat should have been. Installed in top, moved to bottom wrong hole, moved to bottom right hole!! Inside pipe noise was lagged stopped vibration.

we are now in summer so the heating is turned off. It is costing me 25p a day to heat my water 300l tank 4 adults. I’m currently negative cost on my electricity due to batteries, big solar array and iog.

anyone with a noisy cosy try hush mode unbelievably, so happy i switched to a heat pump my bills have more than halved namely due to iog, solar and batteries plus losing gas standing charge. Ps according to octi-aid app my off peak is currently 99%.

i would add you lot on hear really helped me it was so so depressing and a little reassurance and seeing others in the same boat gave me hope it would get sorted.

@l2jad do you find that the hot water takes longer to heat up with hush mode turned on?  I haven’t tried it yet and currently hot water is scheduled for 1 hour to 45c which is long enough even in the depths of winter.

@andrewj depends on your starting temperature, when they moved my sensor to the bottom of the tank it shows  low temperature, yet the water from the tap is actually hot!

This is this morning's graph i’m set to 50 degree. Going to be at least an hour in winter although start temp is a factor. I don’t know what the water temp was last night but dish washer had just run, i had a shower.

I also heat water overnight so length doesn’t bother me,  i do sometimes turn it on fir an hour when grand daughter wants a bath and everyone has showered but its never longer than an hour boost.

@l2jad I was just thinking all things being equal. Our hot water usage doesn’t really change day-on-day so 1 hour is enough; just wondered if you had noticed it needing longer with hush mode on compared to off but if your usage is too varied, there are too many other variables!