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Need Help Optimising My Rushed ECO4 Install: 12kW Bosch Heat Pump

 
Air Source Heat Pumps (ASHPs)
Last Post by bontwoody 2 hours ago
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 MickaMills
(@mickamills)
New Member Member
Joined: 2 days ago
Posts: 2
Topic starter 22/12/2025 4:39 pm  

Hi, thought I would detail my ECO4 experience. I had a Heat pump installed back in April so this is my first winter, I have found several issues with the ECO4 install and would love any help getting the system to be the best it can.

The install was definitely rushed (1.5 days for a hybrid system), flow temp set at around 55 deg c, heating pump set at max speed, I have since set weather comp, and the pump much slower in auto setting making it much quieter running, water temp currently 36 deg at 10 deg c outside and house is 20.5 deg inside. The heat pump is a 12kw Bosch which I’d think is oversized and maybe short cycling, not sure what to do about that though as won’t be paying to swap it.

One other thing that concerns me is getting the system serviced as engineers seem few and far between where I live on the Llyn Peninsula North wales, I’d love to have the heat loss / radiators checked and the system serviced in the spring, any advice appreciated.


This topic was modified 2 hours ago by Mars

   
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bontwoody
 bontwoody
(@bontwoody)
Noble Member Contributor
Joined: 4 years ago
Posts: 960
22/12/2025 4:51 pm  

Hi @mickamills . Welcome to the forum.

It sounds like you have made a good start on optimising you heat pump and yes it could well be oversized.

Do you have any previous energy usage figures you could use to compare. Also heat punk is quite easy to use as a heat loss guide.


House-2 bed partial stone bungalow, 5kW Samsung Gen 6 ASHP (Self install)
6.9 kWp of PV
5kWh DC coupled battery
Blog: https://thegreeningofrosecottage.weebly.com/
Heatpump Stats: http://heatpumpmonitor.org/system/view?id=60


   
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