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Mixergy Tank Failure

 
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Domestic Hot Water & Cylinders
Last Post by bontwoody 9 months ago
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Mars
 Mars
(@editor)
Illustrious Member Admin
Joined: 5 years ago
Posts: 4805
06/10/2025 10:58 pm  

@bontwoody you’re joking! This story gets worse and worse.


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JamesPa
 JamesPa
(@jamespa)
Illustrious Member Moderator
Joined: 3 years ago
Posts: 5254
07/10/2025 7:33 am  

Posted by: @editor
↑

@bontwoody you’re joking! This story gets worse and worse.

In fairness to mixergy several on this forum including me also said switch it off. The apparent damage was so severe there was a real risk of catastrophic failure.  Not worth that risk.

However, this being the case, mixergy should have delivered a replacement tank next day!

 


This post was modified 10 months ago by JamesPa

4kW peak of solar PV since 2011; EV and a 1930s house which has been partially renovated to improve its efficiency. 7kW Vaillant heat pump.


   
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Mars
 Mars
(@editor)
Illustrious Member Admin
Joined: 5 years ago
Posts: 4805
07/10/2025 8:05 am  

Posted by: @jamespa
↑

However, this being the case, mixergy should have delivered a replacement tank next day!

That’s exactly my point. Kit and equipment fails, but this has taken an incredibly long time to resolve given that it’s your source of hot water (and it’s still not resolved).


New to heat pumps? Take the Heat Pump Fundamentals course and use INTRO50 at checkout for 50% off.
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bontwoody
 bontwoody
(@bontwoody)
Noble Member Contributor
Joined: 4 years ago
Posts: 1056
Topic starter 07/10/2025 9:07 am  

@editor The latest is that I phoned the plumbing company yesterday to see when they are coming back and they said they they have sent a quote including the list of parts and are waiting for them to authorise it. I emailed Mixergy to ask them to expedite it. No reply yet.


House-3 bed partial stone bungalow, 5kW Samsung Gen 6 ASHP (Self install)
6.9 kWp of PV
10kWh DC coupled battery
Blog: https://thegreeningofrosecottage.weebly.com/
Heatpump Stats: http://heatpumpmonitor.org/system/view?id=60


   
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Toodles
 Toodles
(@toodles)
Famed Member Contributor
Joined: 4 years ago
Posts: 2903
07/10/2025 9:29 am  

@bontwoody I rather feel that this drawn out episode is not going to do Mixergy’s reputation much good at all! Toodles.


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


   
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Mars
 Mars
(@editor)
Illustrious Member Admin
Joined: 5 years ago
Posts: 4805
07/10/2025 1:59 pm  

@bontwoody how long has it been now since you started the process to get it replaced?


New to heat pumps? Take the Heat Pump Fundamentals course and use INTRO50 at checkout for 50% off.
Rewritten and updated for 2027
📘 From Zero to Heat Pump Hero
🛠️ Bodge Buster
🎧 Prefer to listen? Heat Pumps Explained – use AUDIO50 at checkout for 50% off.


   
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bontwoody
 bontwoody
(@bontwoody)
Noble Member Contributor
Joined: 4 years ago
Posts: 1056
Topic starter 09/10/2025 12:17 pm  

@editor @mixergy 

This is now 4 weeks without a hot water cylinder.

I currently have a non-functioning cylinder in the cupboard and functioning but non installed one in the hall.

I am currently being bounced between the installer, who are waiting for Mixergy to approve the installation quote and Mixergy who say they are dealing with it since Monday!

Ive got to say this isnt the service level I was expecting in what is really an urgent situation.


House-3 bed partial stone bungalow, 5kW Samsung Gen 6 ASHP (Self install)
6.9 kWp of PV
10kWh DC coupled battery
Blog: https://thegreeningofrosecottage.weebly.com/
Heatpump Stats: http://heatpumpmonitor.org/system/view?id=60


   
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Mars
 Mars
(@editor)
Illustrious Member Admin
Joined: 5 years ago
Posts: 4805
09/10/2025 1:14 pm  

@bontwoody, I have to say, the response time here is really concerning. This is your hot water we’re talking about, not a minor issue. Most installers will warn that heating might be off for a few days during works, but leaving someone without hot water for this long is unacceptable. 

@mixergy, please could you respond and explain what’s going on here?


New to heat pumps? Take the Heat Pump Fundamentals course and use INTRO50 at checkout for 50% off.
Rewritten and updated for 2027
📘 From Zero to Heat Pump Hero
🛠️ Bodge Buster
🎧 Prefer to listen? Heat Pumps Explained – use AUDIO50 at checkout for 50% off.


   
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 ASHP-BOBBA
(@ashp-bobba)
Prominent Member Member Professional+
Joined: 2 years ago
Posts: 493
09/10/2025 10:05 pm  

OH my just read all of this, so you are still waiting? 

 


AAC Group Ltd covering the Kent Area for design, supply and installation of ASHP systems, service and maintenance, diagnostics and repairs.


   
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bontwoody
 bontwoody
(@bontwoody)
Noble Member Contributor
Joined: 4 years ago
Posts: 1056
Topic starter 09/10/2025 10:18 pm  

@ashp-bobba Yes unfortunately 😔  I just read your other thread but my issue isn't quite the same as I was using the immersion on cheap rate and not the heat pump to heat the cylinder. Not nearly as interesting 😁


House-3 bed partial stone bungalow, 5kW Samsung Gen 6 ASHP (Self install)
6.9 kWp of PV
10kWh DC coupled battery
Blog: https://thegreeningofrosecottage.weebly.com/
Heatpump Stats: http://heatpumpmonitor.org/system/view?id=60


   
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 ASHP-BOBBA
(@ashp-bobba)
Prominent Member Member Professional+
Joined: 2 years ago
Posts: 493
09/10/2025 10:24 pm  

@bontwoody well I hope it all get repaired for you.


AAC Group Ltd covering the Kent Area for design, supply and installation of ASHP systems, service and maintenance, diagnostics and repairs.


   
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bontwoody
 bontwoody
(@bontwoody)
Noble Member Contributor
Joined: 4 years ago
Posts: 1056
Topic starter 09/10/2025 10:33 pm  

@ashp-bobba Thanks. I'll be interested to find out why the system failed when they get around to telling me.


House-3 bed partial stone bungalow, 5kW Samsung Gen 6 ASHP (Self install)
6.9 kWp of PV
10kWh DC coupled battery
Blog: https://thegreeningofrosecottage.weebly.com/
Heatpump Stats: http://heatpumpmonitor.org/system/view?id=60


   
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