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Octopus Cosy Heat Pump Owners & Discussion Thread

AndrewJ · 2025-10-23T11:37:06Z

I'd like to discuss how you find it, how you run it and so on.

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Air Source Heat Pumps (ASHPs)

Last Post by HarrisonC 3 days ago

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KevH

(@kevh)

Trusted Member Member

Joined: 1 year ago

Posts: 62

28/03/2026 1:40 pm

Posted by: @harrisonc

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I have to go into the installer mode and check the version number.

Many thanks. I have yet to enter installer mode, maybe I should take this an ideal opportunity.

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swwils

(@swwils)

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Joined: 7 months ago

Posts: 93

28/03/2026 7:56 pm

@harrisonc mine is an early 9.

I've seen it under report, but it's about 8% over on SPF. Which is very good for onboard monitoring really.

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HarrisonC

(@harrisonc)

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Joined: 5 months ago

Posts: 20

29/03/2026 8:06 am

Went down to 0 degrees last night. Still oscillates a bit but not as bad as before.

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swwils

(@swwils)

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Posts: 93

15/04/2026 7:17 am

Hush mode now released. I've not tried it yet. Should be good!

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Mars

(@editor)

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Joined: 5 years ago

Posts: 4578

15/04/2026 9:05 am

@swwils I saw the announcement last week. I'm going to be really interested to see how effective it really is.

Get a copy of The Ultimate Guide to Heat Pumps

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AgentGeorge

(@agentgeorge)

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Posts: 170

15/04/2026 9:37 am

Maybe you can email Greg and ask him to come on a pod cast of yours and talk about Hush Mode and if it’s available for Cosy6,9,12

He's always doing publicity stunts, last vid was him in a London cab, where the driver uses the octopus tariff and saves 70% on running costs compared to his old Diesel

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HarrisonC

(@harrisonc)

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Posts: 20

15/04/2026 9:41 am

@editor I can't tell much on the sound side outside as I run mine in a different way to most (house set point 30 degrees, overall house temp managed by flow temp settings) but from the heat output data it seems the hot water cycle peaks at 6kW still but ramps down whilst running to 5kW. When I ran a test with fixed flow for central heating it was pinned at 5kW output. It will be hard to test actual sound without a decibel meter.

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AgentGeorge

(@agentgeorge)

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15/04/2026 9:49 am

@harrisonc sound meter App is available for iphone, I have one called NIOSH SLM

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HarrisonC

(@harrisonc)

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Posts: 20

15/04/2026 10:08 am

@agentgeorge I'll give it a go with my Apple Watch later and see what it says. My HP location is down a narrow path, which is why I had to go with a Cosy cause of the minimum front clearance, so any sound is amplified quite a lot.

I am mainly hoping it helps with the sounds in the living room in the winter. When it was negative temps outside and there was nothing on in the living room you could hear the heat pump running (suspect this is because they installed it on my existing path rather than a separate base).

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KevH

(@kevh)

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Joined: 1 year ago

Posts: 62

15/04/2026 11:05 am

Our Cosy 9 has been in hush mode for three days. So far the reduced 'power' isn't impacting negatively though the aot has not dropped too far so hard to tell.
It does seem to be more consistently running at low revs, possibly for longer, however both kW in and cop are marginally down. As always it's difficult to say after just a few days.

Overall I'd say thumbs up.

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AndrewJ

(@andrewj)

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Posts: 209

Topic starter 15/04/2026 1:59 pm

I haven't tried it yet, I've been waiting for reports from the wild. It strikes me that with the OAT we have at the moment it's not going to be very noticeable, but come next heating season when it's consistently below 5c it will be interesting - I've certainly been able to hear mine at night when its that cold. It's positioned below our bedroom window so I'd say about 3m from my ears through triple glazing and I'm aware when it's running BUT it's not loud enough to stop me falling asleep or wake me up. I'm more interested in it from an efficiency perspective rather than noise reduction.

@editor: I'm (still??) not receiving notification emails of updates and relying on visiting and seeing what has changed.

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KevH

(@kevh)

Trusted Member Member

Joined: 1 year ago

Posts: 62

15/04/2026 2:24 pm

Posted by: @kevh

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Edit

Meant to say "It does seem to be more consistently running at low revs, possibly for longer, however kW in are down whilst COP is marginally up.