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AllyFish
@allyfish
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Noble Member
Joined: Oct 31, 2022
Last seen: Aug 20, 2025
Profile Activity
Topics: 23 / Replies: 471
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RE: Is the Grant controller a thermostat?

Same here @Marvinator80. I have max LWT (in my case 45degC) set to 0degC. To be fair below 0degC I don't reach max LWT, due to continual defrost cycle...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Grant ASHP not reaching target temperatures

Hello and welcome. The Grant Aerona units are known to spend a lot of time in defrost in winter conditions, usually every 45-60 minutes. That does see...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Our Grant Aerona R32 13kW ASHP installation

@mike-patrick I called Grant HQ. They arranged for Olly the local service engineer to attend. Pricey service of the ASHP and system cylinder at £250. ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Is the Grant controller a thermostat?

The Grant units seem particularly keen to defrost around every 45 minutes when there's high relative humidity and the evaporator refrigerant temperatu...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Solar battery size- advice please!

@misterB consider tariffs such as Cosy Octopus that offer two 3hr low rates a day. If you can get an EV tariff then so much the better 😉

2 years ago
Forum
Energy Storage
Reply
RE: Grant Aerona 3 Help programing

@marvin91 there’s a separate post for weather compensation on Grant Aerona. It’s quite simple. You’ve got the Grant installation manual? It’s a redact...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Grant Aerona 3 Help programing

@mab I have external clunky digital room stat. I think Grant only use these because few if any of their installers understand how to program the Chofu...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Grant Aerona 3 Help programing

Hi there, just to clarify. On the Grant pre-plumb cylinder, the thermostat dial is the hot water thermostat - a simple on/off device to call for hot w...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Is the Grant controller a thermostat?

@mikefl I have a theory the closeness of the outdoor air sensor on the Grant Aerona's may be causing some adverse response. During defrost the outdoor...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Grant Aerona 13KW - can I boost it?

Depending on your weather compensation settings, disabling WC and reverting to constant leaving water temperature would work. Depends on what outdoor ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Is the Grant controller a thermostat?

@roamingbull or disable weather compensation for a short period and revert to constant higher flow temperature. My 10kW Aerona is defrosting every 45 ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Electricity price predictions

Welcome to the Cosy corner @Toodles. We pay an average of 20.4p/kWh including VAT & standing charge. 88% of our electricity import is at the low r...

2 years ago
Forum
Electricity, Tariffs, Monitoring & Providers
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