# Struggling to get good COP from Daikin 9kW

**URL:** <https://community.openenergymonitor.org/t/struggling-to-get-good-cop-from-daikin-9kw/25548>\
**Category:** Heatpump\
**Tags:** daikin\
**Created:** [11 February 2024 08:11 UTC](https://community.openenergymonitor.org/t/struggling-to-get-good-cop-from-daikin-9kw/25548 "2024-02-11T08:11:08Z")\
**Posts on this page:** 1\
**Showing post:** 17

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**Author:** ![squarepeg77](https://community.openenergymonitor.org/letter_avatar_proxy/v4/letter/s/0ea827/32.png) [@squarepeg77](https://community.openenergymonitor.org/u/squarepeg77)\
**Post date:** [14 February 2024 20:11 UTC](https://community.openenergymonitor.org/t/struggling-to-get-good-cop-from-daikin-9kw/25548/17 "2024-02-14T20:11:27Z")

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**Balancing radiators**  
Should the installers have done it? Maybe, but probably not. My installer just roughly made sure every radiator was heating up…

There’s a big thread here:

> [@Radiator Balancing - is there an idiots guide?](https://community.openenergymonitor.org/t/radiator-balancing-is-there-an-idiots-guide/24721):
>
> I’ve been reading the monster Daikin thread with common references to radiator balancing. I’m convinced some of my short cycling issues are due to poor balancing. Very much like Marko says, the house is getting warm but i’m seeing more cycling than I’d hope. Even though COP hits Vaillant specs!! My confirmed and recorded heat loss at -3C last winter is around 4kW, so my 5kW Arotherm is not oversized etc. I’ve messed about in the past and opened some up “a quarter of a turn”. Bu…

The Heat Geek article a few posts down is probably a good place to start. I’ve used a little infrared thermometer and a two probe thermometer to try and balance the radiators, with varying success.

You don’t need to aim for perfection, but if your radiators are wildly unbalanced then it’s undoing some of the purpose of the radiator replacements and might be leading to too much warm water returning to the heat pump, and more frequent cycling.

One thing that took me a little while to get used to: if you have a cool radiator (kitchen, in our case) you have to restrict the flow on the radiators “before” it in the piping run, to send more heat to the one you want. It’s a slow process, make small changes and leave it a bit to see if it improves.

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