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Air Source Heat Pumps (ASHPs)
Last Post by bontwoody 2 hours ago
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bontwoody
 bontwoody
(@bontwoody)
Noble Member Contributor
Joined: 3 years ago
Posts: 816
24/05/2025 9:06 pm  

@johnmo absolutely agree. However I've had conversations with heating engineers who categorically take a different opinion 🙃

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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 Johnmo
(@johnmo)
Noble Member Member
Joined: 2 years ago
Posts: 545
24/05/2025 10:08 pm  

Posted by: @bontwoody
↑

@johnmo absolutely agree. However I've had conversations with heating engineers who categorically take a different opinion 🙃

Sorry, missed something, what is the different opinion, they are taking?

 

Maxa i32V5 6kW ASHP (heat and cooling)
6.5kW PV
13.5kW GivEnergy AIO Battery.


   
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 JohnnyB
(@johnnyb)
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Joined: 5 months ago
Posts: 46
Topic starter 24/05/2025 10:08 pm  

Interesting discussion, and good to get the other view of the heat pumps ability to heat the DHW. I'm not againest using the immersion overnight and I will have a solar diverter to make us of any surplus electricty from the solar panles. One of the reasons for asking for a 300ltr tank is so we have plenty of hot water with out the HP having to fire up so often, with the lower temperature we have the DHW tank set at we find a 200ltr tank is getting cold after we have all had a shower.  The heat pump keeps and and we don't run out of hot water, but I think a larger tank will help with the morning rush.

We have a well insulated 60mm concrete screed that stays warm for a few hours in the annexe so even if the heat pump was heating the DHW for 2 hours I wouldn't expect the house to cool down noticably.

We are going to be fitting a wood burner so that could help on really cold days, although we do expect the house to stay warm without needing that extra heat.

The current installers offer Samsung or Vaillant, with Vaillant costing over £1k more but offering a 7 kW. They are open to fitting what I want and I think they can make the figures work for the grant with the smaller HP, but I don't want to insist on the smaller model without asking questions here to see what others think.


   
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 Johnmo
(@johnmo)
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Joined: 2 years ago
Posts: 545
24/05/2025 10:24 pm  

Posted by: @johnnyb
↑

They are open to fitting what I want and I think they can make the figures work

Panasonic are reported to be very good. They also have a flat output kW with variable outside temp. Quiet, good running algorithms so you almost never get short cycling, if I was buying again it would be my first port of call. Pretty cheap as well. So a 5kW version would be fine. They do cooling out the box as well according to the blurb.

Maxa i32V5 6kW ASHP (heat and cooling)
6.5kW PV
13.5kW GivEnergy AIO Battery.


   
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bontwoody
 bontwoody
(@bontwoody)
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Joined: 3 years ago
Posts: 816
24/05/2025 11:17 pm  

Posted by: @johnmo
↑

Posted by: @bontwoody
↑

@johnmo absolutely agree. However I've had conversations with heating engineers who categorically take a different opinion 🙃

Sorry, missed something, what is the different opinion, they are taking?

 

The point about needing a legionella cycle at all and how hot the water needs to be if you use one.

Its an interesting point that if people cannot agree on the correct temperature then where does the heating of the DHW stop and the legionella cycle begin. Hence my comment about the rule for all hot water requirements to be fulfilled by the heat pump.

BTW @johnnyb  don't mention the intention to install a wood burner as that would also be an issue with getting the grant. 

 

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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