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Peak Energy Products V therm 16kW unit heat pump not reaching flow temperature

 
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Air Source Heat Pumps (ASHPs)
Last Post by DaveC 3 weeks ago
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bobflux
 bobflux
(@bobflux)
Estimable Member Member
Joined: 2 months ago
Posts: 80
04/03/2026 6:47 pm  

Posted by: @jamespa
↑
You are absolutely correct that the capacity table MUST be consulted.

Yes, here's mine. From the service manual parts numbers (compressor etc), the 12-14-16kW models are identical, and all are actually "much more than 16kW at 7/35°C heat pump" with a software limit to the official power on the label (in my case 16kW).

Since the three models are the same, in the same conditions (air, water, power) the COP is the same and defrost is also the same. The more powerful models just allow more watts at worse COP, which may be useful. Minimum power is the same. The heat exchangers are the same, so a bigger label won't magically pull more watts from the air at the same deltaT or cause less frost to form...

image

Sometimes below this table you get a tiny footprint *includes defrosting or *does not include defrosting, but that's at a specific temp/humidity, not necessarily yours.

Personally, since I have about 500 tons of stone walls and slabs with exterior insulation, I oversized it by about 2x, so it runs at high COP during the day when air temperature is higher, COP is higher, and electricity from PV is free. 

 

 

 

 



   
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 johnd
(@johnd)
Active Member Member
Joined: 12 months ago
Posts: 25
Topic starter 01/04/2026 1:28 pm  

@davec did you get anywhere with the installer?



   
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 DaveC
(@davec)
Eminent Member Member
Joined: 3 months ago
Posts: 28
01/04/2026 1:40 pm  

@johnd yes, the original installer is going to remove the Peak ASHP and cylinder and fit a Grant cylinder for us.

Just waiting on timescales from them once they’ve sourced the correct cylinder we’ve asked for, to work with the new Grant 12kw ASHP that Ribble Valley Heating are currently booked in to install mid May.

We haven’t had an exact figure back from them on how much we’ll get back but it covers the cost of the new replacement cylinder and should be a reasonable amount to go against the new Grant ASHP.

They will then deal with Peak directly to recover their costs as best as they can.


11kw Peak Energy ASHP - SunSynk 3.6kW Solar Inverter with 3.5kw panels and GSL 10kWh home battery


   
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