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AllyFish
@allyfish
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Noble Member
Joined: Oct 31, 2022
Last seen: Jun 18, 2025
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Topics: 22 / Replies: 468
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RE: Heat Pumps - An Expensive Folly?

Well, if ASHPs are an expensive folly, I'm a fool. Currently I'm requiring about 86kWh a day for heating 3/4 floor area of the house and daily hot w...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Samsung Launches the EHS Mono HT Quiet – A High Temperature, Low Noise Heat Pump Ideal for Home and Building Renovations

@andehh the Samsung EHS Mono HT has a more complicated refrigeration system with intercoolers to stop the refrigeration circuit cooking itself for hig...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: 17kw Grant Aerona heat pump not performing

@soniks this is good news. I'm going to contact Grant regarding why my weather compensation was not enabled, as you point out, it's clearly stated as ...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Looking at putting in a PV system

Hi Jeff. Solar PV panels are now £0.50 per watt, electricity cost is only going in one direction, so max out all available roof space. Exporting power...

3 years ago
Forum
Solar Photovoltaic (PV)
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RE: 17kw Grant Aerona heat pump not performing

@soniks use the default Grant settings as a start. Have you found out why your ASHP is cycling on and off and what is causing it? That's a separate is...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: 17kw Grant Aerona heat pump not performing

@soniks it's exactly as per @derek-m comment. Something is switching your ASHP on and off 2 or 3 times an hour. Because of that your flow temperature ...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Another 17kw Grant Heat Pump - Advice Needed!

@bretix we're all learning on these systems 🙂 I would set the secondary pump to full flow, always. If the pipe distance between your low loss header ...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Another 17kw Grant Heat Pump - Advice Needed!

@bretix the dial on the HW cylinder is just a cylinder stat, turn and set it to whatever hot water storage temperature you want, it will then revert t...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Vaillant 10kw ASHP installation. Installer issues

Oversize unit: it may cycle in and off more on low output, as the heating load might be below the minimum turn down capacity of the unit. That will co...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: ASHP at cold temperatures

As Osiwu says, short circuiting of the evaporator airflow, where the discharge air ends up back at the coil inlet face, will reduce performance. But t...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Rate the quality of your heat pump design and installation

Really sorry to read this @jswhite. 16kW is a large unit for 120m2 heated area, especially if you usually have diversity and only some rooms heated. Y...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Peering over the ASHP cliff

The HIVE main thermostat overrides steady ASHP control if it's switching on and off. You can tell if it is from the HIVE app temperature graph. The HI...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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