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ASHP for small garage and workshop

 
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Air Source Heat Pumps (ASHPs)
Last Post by BobTSkutter 5 months ago
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cathodeRay
 cathodeRay
(@cathoderay)
Famed Member Moderator
Joined: 3 years ago
Posts: 2081
18/01/2025 8:20 pm  

Posted by: @bobtskutter
↑

You have a plate heat exchanger for system separation don't you? 

Yes, I do. I also have glycol in the primary circuit, and use a specific heat capacity of 4.05 for that (I noticed you use 4.2 ie pure water). The secondary circuit has quite a large volume, I haven't formally worked it out, but there is one huge K3 in the kitchen (15L?) plus several medium sized K3s and a few smaller ones, Perhaps (guessing here a bit) 100L in all just in the rads.

Posted by: @bobtskutter
↑

With a plateHex i get 7.7kg ice, no hex 4kg.

Either way, that is a lot of ice. Credibility/sanity check?

 

Midea 14kW (for now...) ASHP heating both building and DHW


   
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jamespipe
 jamespipe
(@jamespipe)
Eminent Member Member
Joined: 2 years ago
Posts: 13
19/01/2025 12:51 pm  

Posted by: @transparent
↑

It's mainly sold in Australia & NZ where they want cooling as well as heating.

Mitsubishi heat pumps works great in low temperatures. Requires minimal maintenance. Here in Victoria, they are offered under government rebate program.  

Heat pump installer at ipromiseaustralia.com.au


   
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 BobTSkutter
(@bobtskutter)
Estimable Member Member
Joined: 6 months ago
Posts: 94
Topic starter 24/02/2025 6:49 pm  

Hello everyone, time for a dumb question.

Am I allowed to self install a heat pump in the UK?

It would be the only one on the property.

It would be at least 1m from the boundary.

The size of the machine would be less than 0.6m3.

I am not MCS registered.

Thanks

Bob


   
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bontwoody
 bontwoody
(@bontwoody)
Noble Member Contributor
Joined: 3 years ago
Posts: 836
24/02/2025 7:01 pm  

@bobtskutter A significant number of us have Bob. see this https://renewableheatinghub.co.uk/forums/renewable-heating-air-source-heap-pumps-ashps/can-i-install-my-own-ashp, also look up Glynn Hudson on Youtube

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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Transparent
 Transparent
(@transparent)
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Joined: 4 years ago
Posts: 2437
24/02/2025 8:09 pm  

That's a good question @bobtskutter

Yes, you can install a heat-pump on a DIY basis.

The legal requirements you need to fulfil are:

  • Apply to your DNO using their online process for Low Carbon Technology (LCT)
  • Get the mains electrical connections installed, or approved by, a qualified electrician who will supply you with a Building Regs Part-P certificate
  • Apply to a Building Control organisation, such as your Local Planning Authority, to address Part-L and any other issues such as noise complience

 

Let us know if you want any of the above explained more fully.

Save energy... recycle electrons!


   
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 BobTSkutter
(@bobtskutter)
Estimable Member Member
Joined: 6 months ago
Posts: 94
Topic starter 24/02/2025 9:00 pm  

Thank you.  The proposed ASHP would be a low power (4kW) device connected to an existing supply.  Do I still need to inform the DNO?

Thanks

Bob


   
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Transparent
 Transparent
(@transparent)
Illustrious Member Moderator
Joined: 4 years ago
Posts: 2437
24/02/2025 10:28 pm  

Yes Bob.

An LCT Application is for all sites where a heat-pump or EV charger is to be connected to an existing supply.

To see an example of where I believe the assessment has 'gone wrong' have a look at my comments on the topic about Twin 10kW ASHPs with volumisers.

Save energy... recycle electrons!


   
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 BobTSkutter
(@bobtskutter)
Estimable Member Member
Joined: 6 months ago
Posts: 94
Topic starter 25/02/2025 6:10 pm  

@transparent, thank you.  That makes sense.

Much appreciated.

Regards

Bob


   
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