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JamesPa
@jamespa
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Joined: Apr 3, 2023
Last seen: Nov 14, 2025
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Topics: 18 / Replies: 3373
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RE: Balancing a low loss header/buffer tank on a Grant Aerona 2 13kw r32 system

OK so lets start with some back of the envelope stuff. Your peak heating load is say 3kW. So you need 3/(4.2*4) l/s = 0.18l/s=10l/min to carry this ...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Balancing a low loss header/buffer tank on a Grant Aerona 2 13kw r32 system

OK so if you are consuming 1300kWh per year that's about £300 at current electricity prices, less if you have an ashp-optimised tarrif. So you may fe...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: The good, the bad and the not that great – my heat pump installation

sorry to bring it back to gutter level - but its builders innit. I'm seriously not sure that anything we are hearing about ASHPs, frustrating though...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Midea ASHP – how to set weather compensation

That may be the case in your house but its definitely not the case in mine nor in many others reported here. Even with my current gas boiler (with mo...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Midea ASHP – how to set weather compensation

They may be for all I know! Perhaps 'adaptive' mode (or other manufacturers equivalents) use such controllers. AFAIK the problem with delay ...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Balancing a low loss header/buffer tank on a Grant Aerona 2 13kw r32 system

I think you are confusing kWh (energy) with kW (power = rate of using energy). Think of the first as distance and the second as speed. It would help...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Midea ASHP – how to set weather compensation

OK so we DO agree on the desirability of changing the flow temperature. Thats the most important point. AFAIK commercial heat pump controllers abso...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Balancing a low loss header/buffer tank on a Grant Aerona 2 13kw r32 system

Can you clarify. Do you mean 1300kWh and is this electricity in or heat out? For UFH that's completely ridiculous (as you obviously realise)...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Midea ASHP – how to set weather compensation

I think you (for the avoidance of doubt by you I mean @tasos) may be misunderstanding what variable the inverter reacts to. It changes the energy del...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Midea ASHP – how to set weather compensation

Maybe, or maybe (depending on the system) you need a differential component also, which is why PID controllers are a thing. And maybe you want to tak...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Midea ASHP – how to set weather compensation

... which is precisely how it achieves cost savings, by playing with LWT in response to OAT, predicted OAT, quite possibly predicted solar gain and wi...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Balancing a low loss header/buffer tank on a Grant Aerona 2 13kw r32 system

OK got you. Thats how a buffer should, ideally, be run. I know of two basic techniques - 1. Adjust pump speeds (somehow) so the flow rates in an...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
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