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My Octopus Cosy 6 Heat Pump Journey: From Quote to Completion

 
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Air Source Heat Pumps (ASHPs)
Last Post by wreckguru 4 weeks ago
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Toodles
 Toodles
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17/11/2024 9:19 am  

@wreckguru ‘Seasonal’ COP suggests that an accurate assessment requires that data is required from a full season, (and I would suggest that for truer figures, this should be from four full seasons). COP may be a measurement of any duration but obviously the longer the sample, the more meaningful it might be. Regards, Toodles.

This post was modified 2 months ago by Mars

Toodles, he heats his home with cold draughts and cooks his food with magnets.


   
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 wreckguru
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Topic starter 17/11/2024 4:47 pm  

@toodles I assume, but have not checked, that the adjustment can be made empirically?


   
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Toodles
 Toodles
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17/11/2024 5:49 pm  

@wreckguru With Homely, the estimated COP has the rider that it is only as accurate as the data it is given to work with; I am very sceptical of claims for my system’s COP as I am reliant on the Daikin data obtained from the bog standard measuring equipment fitted as standard.
By the way, I am too lazy to note down my consumption and heating figures every few weeks and my Homely graphs don’t provide historic data so establishing my SCOP would be a PITA!
Should I be allowing +or- 5%, maybe 10% - even 20%? I really don’t know, but I am assuming that any errors are probably fairly consistently erroneous! Homely often reports my COP between 3.8 - 5.5 depending on OAT and I am heating to 22.5 degrees C 24/7. This reported figure may be inaccurate but I suppose comparative. As they say, GIGO. I would be very pleased if the figures could be confirmed as correct - but the bottom line is acceptable as far as we are concerned, we are comfortable and we can afford the bills. Mind you, I am all in favour of reducing the iniquitous ‘Spark Gap’ and paying a more reasonable price for my green energy! Regards, Toodles.

This post was modified 2 months ago by Mars

Toodles, he heats his home with cold draughts and cooks his food with magnets.


   
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 Ian
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21/11/2024 5:52 pm  

@wreckguru how has your COP been during these last few cold days?

This post was modified 2 months ago by Mars

   
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 wreckguru
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Topic starter 23/11/2024 11:44 am  

3.46, so pretty decent I think?

1000042790

   
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 Nic Challacombe
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16/12/2024 9:29 pm  

@wreckguru, is there any chance you can get the measurements of your 250 litre tank? I'm in the process of having a survey done by octopus and am thinking of locations for the hot water tank to go, and I'm limited on cupboard size inside the house? They have said the tank can go in cupboard but with all vessels and volumisers above in the loft. Thanks mate

This post was modified 4 weeks ago by Mars

   
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Toodles
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17/12/2024 2:53 pm  

There is some sort of association between Octopus and Heat Geek now isn’t there? Heat Geek have been doing work on tank designs and sizing recently; it may be worth having a look at the HG website if like me, you are short of space for a DHW. (I solved the problem by going down a totally different route: the Sunamp Thermino range of immersion heater / solar powered / heat pump driven routes is expensive but solved our difficulty). Regards, Toodles.

Toodles, he heats his home with cold draughts and cooks his food with magnets.


   
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 wreckguru
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Topic starter 17/12/2024 3:00 pm  

Probably better from the picture here.  They also supply Joule cylinders (same manufacturer). 

image

↑

@wreckguru, is there any chance you can get the measurements of your 250 litre tank? I'm in the process of having a survey done by octopus and am thinking of locations for the hot water tank to go, and I'm limited on cupboard size inside the house? They have said the tank can go in cupboard but with all vessels and volumisers above in the loft. Thanks mate

 


   
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 wreckguru
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Topic starter 17/12/2024 5:01 pm  

Yes - https://about.heatgeek.com/partners

And a video/interview.

https://www.youtube.com/watch?v=ZlvDKiSrvW4

They get a lot of criticism from other installers, but bang for buck it's still a no brainer.  And with winter SCOP now a 3.96 I feel efficiency isn't a real world concern...

 

Posted by: @toodles
↑

There is some sort of association between Octopus and Heat Geek now isn’t there? Heat Geek have been doing work on tank designs and sizing recently; it may be worth having a look at the HG website if like me, you are short of space for a DHW. (I solved the problem by going down a totally different route: the Sunamp Thermino range of immersion heater / solar powered / heat pump driven routes is expensive but solved our difficulty). Regards, Toodles.

 


   
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