Search with Wattson

Notifications

Clear all

Joining the Renewable Heating Hub forums is completely free and only takes a minute. By registering you’ll be able to ask questions, join discussions, follow topics you’re interested in, bookmark useful threads and receive notifications when someone replies. Non-registered members also do not have access to our AI features. When choosing your username, please note that it cannot be changed later, so we recommend avoiding brand or product names. Before registering, please take a moment to read the Forum Rules & Terms of Use so we can keep the community helpful, respectful and informative for everyone. Thanks for joining!

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.

Page 30 / 31 Prev Next

Air Source Heat Pumps (ASHPs)

Last Post by JamesPa 1 week ago

366 Posts

15 Users

54 Reactions

44.3 K Views

RSS

Mars

(@editor)

Illustrious Member Admin

Joined: 5 years ago

Posts: 4549

15/04/2026 3:29 pm

Posted by: @andrewj

↑

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

Looks like you're not subscribed to any topics... please resubscribe and you'll start receiving them.

Get a copy of The Ultimate Guide to Heat Pumps

Subscribe and follow our YouTube channel!

ReplyQuote

AndrewJ

(@andrewj)

Reputable Member Member

Joined: 1 year ago

Posts: 205

Topic starter 15/04/2026 9:12 pm

Posted by: @editor

↑

Looks like you're not subscribed to any topics... please resubscribe and you'll start receiving them.

Ok. This was a thread I started!

ReplyQuote

Mars

(@editor)

Illustrious Member Admin

Joined: 5 years ago

Posts: 4549

15/04/2026 10:25 pm

@andrewj, it was some housekeeping where some subscriptions were removed. There’s a new subscribe button above…

Get a copy of The Ultimate Guide to Heat Pumps

Subscribe and follow our YouTube channel!

ReplyQuote

AgentGeorge

(@agentgeorge)

Estimable Member Member

Joined: 1 year ago

Posts: 170

15/04/2026 10:33 pm

@andrewj

got an astounding COP over 6 today

Has Octopus changed something on my Cosy6

👍

ReplyQuote

AndrewJ

(@andrewj)

Reputable Member Member

Joined: 1 year ago

Posts: 205

Topic starter 15/04/2026 10:52 pm

@editor yep - I commented just to see if I’d get notified, and I did 😀

👍

ReplyQuote

AndrewJ

(@andrewj)

Reputable Member Member

Joined: 1 year ago

Posts: 205

Topic starter 15/04/2026 10:55 pm

@agentgeorge no idea if they’ve made changes, but I got 5.16 which is amazing. Mind you OAT was over 12c whilst hot water and heating was on; it’s been off since 8am. I expect it’s more to do with that.

ReplyQuote

swwils

(@swwils)

Estimable Member Member

Joined: 7 months ago

Posts: 92

26/04/2026 10:00 am

I've had a few hours with hush mode now, seems to have helped my noise issue considerably. The fan control seems smarter, compressor noise is also different.

It caps output at 8.4kW heat so no issues there.

Performance seems better as well.

🧐

ReplyQuote

AndrewJ

(@andrewj)

Reputable Member Member

Joined: 1 year ago

Posts: 205

Topic starter 26/04/2026 11:07 am

I take it “a few hours” is just a figure of speech and you’ve had it turned on for some time? Reports seem to be positive but it’s such an odd time of year, heating-wise, that I’m not sure it’s really possible to draw conclusions?? My main thought was if it is so good why isn’t it default behaviour - indeed, why isn’t it just baked into the firmware rather than being a switchable option? As with everything Octopus, there’s such a lack of actual technical info that it’s impossible to tell what’s what! I sound cynical but there seems to be so much to get right that throwing some more options into the mix without proper info just makes things more difficult: why would you turn it on; what impact will it have; why would you turn it off; etc? I haven’t found any explanation.

This post was modified 1 week ago by Mars

ReplyQuote

swwils

(@swwils)

Estimable Member Member

Joined: 7 months ago

Posts: 92

26/04/2026 2:20 pm

@andrewj

I have no heating load right now so haven't actually run it in hush mode that long.

Loads of other makes have a selectable silent / quiet / eco / hush mode. It's just a similar thing really.

It just happens to help with my particular issue as well.

ReplyQuote

Mars

(@editor)

Illustrious Member Admin

Joined: 5 years ago

Posts: 4549

26/04/2026 8:10 pm

@swwils I guess the true test will be November/December when it cranks up to run full speed.

Get a copy of The Ultimate Guide to Heat Pumps

Subscribe and follow our YouTube channel!

ReplyQuote

KevH

(@kevh)

Trusted Member Member

Joined: 1 year ago

Posts: 62

26/04/2026 10:39 pm

Posted by: @editor

↑

@swwils I guess the true test will be November/December when it cranks up to run full speed.

To be fair to Octopus, TJ is quoted as advising that hush mode is not appropriate to peak demand season. 😀

ReplyQuote

AndrewJ

(@andrewj)

Reputable Member Member

Joined: 1 year ago

Posts: 205

Topic starter 26/04/2026 11:02 pm

Posted by: @kevh

↑

Posted by: @editor

↑

@swwils I guess the true test will be November/December when it cranks up to run full speed.

To be fair to Octopus, TJ is quoted as advising that hush mode is not appropriate to peak demand season. 😀

To be fair to Octopus customers, it would be better if we could get detailed information from a more official channel and less cryptic source than a Social Media manager on Facebook. I appreciate that he helps resolve service problems but it’s frustrating that we can’t get more info from technical sources - it would help if there was consistency of advice as well.

ReplyQuote