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Antifreeze top up for my heat pump - is this a rip off?

 
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Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Last Post by Mars 8 hours ago
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 Johnmo
(@johnmo)
Noble Member Member
Joined: 2 years ago
Posts: 537
23/05/2025 9:24 am  

Posted by: @ecodan-efficiency
↑

suspect you'll now tell me that's wrong without trying to understand the situation.

Posted by: @ecodan-efficiency
↑

never mentioned Ethylene glycol

You didn't mention anything, except you didn't like my post.

You do as you wish, operate as you like, fill it as you wish. It's your system your money. If you don't like my answers don't read them, simple really.

I just say as it is, based on 4 years experience running low temperature heating system. And the many changes I had to make after install, to get it to run well and not cost a fortune to run. Running costs are half what they were in the first few months of running.

Original system design (buffer and multiple zones, mixer and pump on UFH manifold ) was based on discussion on forums and on many flawed assumptions that frequently come up on forums such as this. I have had buffer, volumiser, multiple thermostats, self balancing valves etc etc. all of which are now in a box on the loft or in the garage,. They are in general bad for efficiency and running costs, as is glycol in any form 

I do know my circulation flow rate is way higher after removing anti freeze, also flow temp was lowered. So heat pump is happier, circulation pump also pulls less watts. I do know a fully open loop system works very well, if on a flat tariff WC is the way to go for cheap heating, not so true on a variable tariff without some modification to running temperature or two offset WC curves. I do know you can keep a stable house temp by just batch charging the floor (if you have enough depth of screed). All are good strategies.

All options have been tested and have evaluated the data recorded.

As said, just ignore my posts if you don't like them. Do what ever you feel you need to do.

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


   
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Mars
 Mars
(@editor)
Illustrious Member Admin
Joined: 4 years ago
Posts: 3219
23/05/2025 9:39 am  

Hi guys, let’s keep this thread focused and constructive, please.

There’s clearly a lot of passion and valuable experience on both sides of this discussion, and that’s a good thing. This forum exists so we can share different perspectives and help homeowners and installers make better-informed decisions. There’s no one-size-fits-all answer, especially with heat pump setups, so some disagreement is inevitable.

That said, I’m drawing a line here. I’ll delete any further bickering or off-topic jabs. Challenge ideas all you like, but please leave the personal digs out of it.

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