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Brown Oily Residue Blocking Air Vent and Weeping Relief Valve... Anyone Seen This?

 
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Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Last Post by Aventus Eco 4 months ago
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 Fred Gray
(@fred-gray)
New Member Member
Joined: 1 year ago
Posts: 4
10/05/2026 1:40 pm  

In London we have a free hazardous waste collection service. I assume all areas have the equivalent. 

https://www.cityoflondon.gov.uk/services/waste-and-recycling/hazardous-waste-collection



   
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Mars
 Mars
(@editor)
Illustrious Member Admin
Joined: 6 years ago
Posts: 4834
10/05/2026 1:40 pm  

@seoras that's genuinely frustrating, and you're not alone in that experience. The disposal infrastructure for glycol from domestic heating systems is woeful... it's one of those areas where the industry has pushed a product into hundreds of thousands of homes without thinking through the end-of-life problem. You're left holding it, literally. 

Very similar to end of life heat pumps that can't get scrapped until refrigerant is recovered.

On the wider point... you're right to be annoyed. Glycol in residential heat pump systems is often specified as a default when it isn't actually necessary. If the system is designed correctly with adequate freeze protection through flow management and controls, many installations simply don't need it. 

I'll make some enquiries tomorrow with my installer network.


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 seoras
(@seoras)
Active Member Member
Joined: 2 years ago
Posts: 10
Topic starter 10/05/2026 1:57 pm  

My local council (Highland Council) advised me to ask local heat pump installers how they deal with it. None has replied. 



   
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Mars
 Mars
(@editor)
Illustrious Member Admin
Joined: 6 years ago
Posts: 4834
10/05/2026 3:21 pm  

Posted by: @seoras
↑

My local council (Highland Council) advised me to ask local heat pump installers how they deal with it. None has replied. 

@aventus-eco any words of wisdom here?

 


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Pre-order with free UK shipping.
Rewritten and updated for 2027
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🛠️ Bodge Buster
New to heat pumps?
Take the Heat Pump Fundamentals course and use INTRO50 at checkout for 50% off.


   
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Aventus Eco
 Aventus Eco
(@aventus-eco)
Active Member Member Professional+
Joined: 1 year ago
Posts: 7
10/05/2026 6:33 pm  

@editor i'm SEPA Registered with a waste license, we dump glycol systems into a dum and pay to have it disposed of at recycling centre, - we don't use gylcol i hate the stuff, i also dont fit antifreeze valves any more as they fail too often, i have approval from Panasonic, Vaillant indirectly say you don't need theM, Stebiel eltron don't need frost protection either and Grant going same way.



   
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