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Replacing Worcester oil boiler with an ASHP

 
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Air Source Heat Pumps (ASHPs)
Last Post by JulianC 3 months ago
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JulianC
 JulianC
(@julianc)
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Posts: 336
Topic starter 27/01/2025 9:48 am  

@judith we probably could have got away with an 8kW ASHP. I have not formally checked. 
But given the modern variable scroll compressors, I’m not there would be any savings?  Havenwise seems to run the hp for longer at a lower temperature. Thus less compressor starts which is good for longevity. 
Similar sized property. 
When you do go EV, make sure the charger you choose can be controlled by Octopus so you can benefit from Intelligent Go e.g. Zappi mk2. Many others. 
Im enjoying the electric journey.


Daikin Altherma 3H HT 12kWh ASHP with Mixergy h/w cylinder; 4kW solar PV with Solic 200 electric diverter; Honda e and Volvo EX30 Ultra Twin Performance electric vehicles with Myenergi Zappi mk1 & Ohme chargers


   
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Majordennisbloodnok
 Majordennisbloodnok
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Posts: 1161
27/01/2025 2:19 pm  

Posted by: @julianc
↑

...

When you do go EV, make sure the charger you choose can be controlled by Octopus so you can benefit from Intelligent Go e.g. Zappi mk2. Many others.

...

I agree with getting a charger that can be controlled by Octopus (since if you want to go down that route then your installation will already allow it) but I'm not entirely convinced that one's charger should be controlled by Octopus. However, that's a very subjective debate going on elsewhere with no obvious right or wrong answer so far.

 


105 m2 bungalow in South East England
Mitsubishi Ecodan 8.5 kW air source heat pump
18 x 360W solar panels
1 x 6 kW GroWatt battery and SPH5000 inverter
1 x Myenergi Zappi
1 x VW ID3
Raised beds for home-grown veg and chickens for eggs

"Semper in excretia; sumus solum profundum variat"


   
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JulianC
 JulianC
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Topic starter 27/01/2025 2:27 pm  

@majordennisbloodnok I’m completely happy with Smart Meter & giving Octopus remote control of my EV charger. I can take back manual control if required. 
The dynamic management of the grid will deliver massive benefits.


Daikin Altherma 3H HT 12kWh ASHP with Mixergy h/w cylinder; 4kW solar PV with Solic 200 electric diverter; Honda e and Volvo EX30 Ultra Twin Performance electric vehicles with Myenergi Zappi mk1 & Ohme chargers


   
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Majordennisbloodnok
 Majordennisbloodnok
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27/01/2025 2:52 pm  

Posted by: @julianc
↑

@majordennisbloodnok I’m completely happy with Smart Meter & giving Octopus remote control of my EV charger. I can take back manual control if required. 
The dynamic management of the grid will deliver massive benefits.

And that makes it the right setup for you. It just also happens to be entirely the wrong setup for me.

The important part of your penultimate post, though, is that if you get an Octopus-compatible charger then you're free to exercise that choice whichever way you decide.

 


105 m2 bungalow in South East England
Mitsubishi Ecodan 8.5 kW air source heat pump
18 x 360W solar panels
1 x 6 kW GroWatt battery and SPH5000 inverter
1 x Myenergi Zappi
1 x VW ID3
Raised beds for home-grown veg and chickens for eggs

"Semper in excretia; sumus solum profundum variat"


   
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1
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JulianC
 JulianC
(@julianc)
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Posts: 336
Topic starter 13/04/2025 5:27 pm  

The annual update. 
so the April 24 to 25 numbers:  we used 4316 kWh. 
SCOP was 3.91

SCOP since starting 3.83. 

So this is ok, but was hoping for better with Havenwise. But switched off since 10th Feb (2months). As they were trialling with Daikin directly. Hopefully they will switch me back in for autumn / winter 2025. 
Otherwise running costs are well below the target. And much better than the oil boiler. 
Will be switching off over summer as the solar PV heats the water. 


Daikin Altherma 3H HT 12kWh ASHP with Mixergy h/w cylinder; 4kW solar PV with Solic 200 electric diverter; Honda e and Volvo EX30 Ultra Twin Performance electric vehicles with Myenergi Zappi mk1 & Ohme chargers


   
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 Cliff-Arnold
(@cliff-arnold)
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Posts: 2
13/04/2025 5:37 pm  

Is this something you are thinking of doing? Or has this already happened?


This post was modified 8 months ago by Cliff-Arnold

   
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JulianC
 JulianC
(@julianc)
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Posts: 336
Topic starter 11/09/2025 4:32 pm  

@cliff-arnold sorry. Only just seen this. I was trialing HavenWise. They need to wider test Daikin, so I was disconnected. But that’s fine as I don’t use the HP in the summer. I will reconnect shortly 


Daikin Altherma 3H HT 12kWh ASHP with Mixergy h/w cylinder; 4kW solar PV with Solic 200 electric diverter; Honda e and Volvo EX30 Ultra Twin Performance electric vehicles with Myenergi Zappi mk1 & Ohme chargers


   
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JulianC
 JulianC
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Topic starter 11/09/2025 4:36 pm  

Daikin Software Update. 

I received a software update for my Daikin ASHP today. Version 5.3 to 5.4

I received a call from the engineer yesterday and he was out today. A firmware update on the hydrobox and the flashed the memory on the outdoor unit. Took 1/2hr. 

Anyone else received this or heard about it?

It’s supposed to improve efficiency in autumn and spring due to quicker restarts between the compressor and the flow switch. 


Daikin Altherma 3H HT 12kWh ASHP with Mixergy h/w cylinder; 4kW solar PV with Solic 200 electric diverter; Honda e and Volvo EX30 Ultra Twin Performance electric vehicles with Myenergi Zappi mk1 & Ohme chargers


   
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Toodles
 Toodles
(@toodles)
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Joined: 3 years ago
Posts: 2296
11/09/2025 4:52 pm  

@julianc I occasionally see announcements on the ‘Onecta’ app about firmware updates but have not seen one in the last few days. All the updates I have received notifications for are done via the ‘net; I have not had any engineer’s visits to carry them out. Regards, Toodles.


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


   
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JulianC
 JulianC
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Joined: 5 years ago
Posts: 336
Topic starter 11/09/2025 4:57 pm  

@toodles thanks. I was told by the engineer that this had to be updated via a visit and not over t’internet.


Daikin Altherma 3H HT 12kWh ASHP with Mixergy h/w cylinder; 4kW solar PV with Solic 200 electric diverter; Honda e and Volvo EX30 Ultra Twin Performance electric vehicles with Myenergi Zappi mk1 & Ohme chargers


   
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