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Crimson
@crimson
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Joined: Jan 16, 2024
Last seen: Oct 22, 2025
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Topics: 4 / Replies: 227
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RE: Grant 13kW Aerona3 - issues getting zones to temp

So an update…   Installers insist a replacement 80 litre buffer tank/LLH is required. They’ve sent me a schematic, from Grant Install pack ...

5 hours ago
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Air Source Heat Pumps (ASHPs)
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RE: Grant 13kW Aerona3 - issues getting zones to temp

I hope out of all of this that I can run the system at a much lower flow temp.   Checked back through endless mails on calcs and it looks lik...

3 days ago
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Air Source Heat Pumps (ASHPs)
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RE: Grant 13kW Aerona3 - issues getting zones to temp

I’m looking at the diagram in the manual and nowhere is there a LLH, item 6 is a volumiser, on the return. No idea why they’re insisting on the LLH....

5 days ago
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Air Source Heat Pumps (ASHPs)
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RE: Grant 13kW Aerona3 - issues getting zones to temp

  It’s a 13kw Aerona3 (has 2 fans). Model: HPID13R32  

5 days ago
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Air Source Heat Pumps (ASHPs)
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RE: Grant 13kW Aerona3 - issues getting zones to temp

So Grant got back to me, and as suspected there’s no requirement for a LLH, but there is for a volumiser. They even said “volume is King”. I suspect t...

5 days ago
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Air Source Heat Pumps (ASHPs)
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RE: Grant 13kW Aerona3 - issues getting zones to temp

Thanks both. I’ll push gor thr glycol, 5% is 5% i cant lose.   I think further back in the thread I have pictures of the pump room and pictur...

6 days ago
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Air Source Heat Pumps (ASHPs)
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RE: Grant 13kW Aerona3 - issues getting zones to temp

I probably got that wrong, looks like the valve is for when a power outage happens?

6 days ago
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Air Source Heat Pumps (ASHPs)
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RE: Grant 13kW Aerona3 - issues getting zones to temp

  Thanks again JamesPa.   My memory is baffling at the moment but broadly I think the plumbers stated approx:   Front UFH zon...

6 days ago
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Air Source Heat Pumps (ASHPs)
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RE: Grant 13kW Aerona3 - issues getting zones to temp

Thanks JamesPa, Sorry for my lack of understanding on terms/2 port v 4 port etc. Just unsure then why the installer insists on this LLH if the man...

6 days ago
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Air Source Heat Pumps (ASHPs)
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RE: Grant 13kW Aerona3 - issues getting zones to temp

Not sure then, I’ve been reading the manual and it does state it needs a volumiser, and even suggests options for low volume systems (why they didn’t ...

6 days ago
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Air Source Heat Pumps (ASHPs)
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RE: Grant 13kW Aerona3 - issues getting zones to temp

A quick google states the Grant Aerona3 requires a low loss header as a mechanical break as part of Grant’s install package - I suspect they’re using ...

6 days ago
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Air Source Heat Pumps (ASHPs)
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RE: Grant 13kW Aerona3 - issues getting zones to temp

Thanks @JamesPa, I think the external volumiser suggestion - supposed to be insulated - was on assumption no space inside but yesterday’s visit it was...

6 days ago
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Air Source Heat Pumps (ASHPs)
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