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AllyFish
@allyfish
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Joined: Oct 31, 2022
Last seen: Jun 18, 2025
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Topics: 22 / Replies: 468
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RE: Is the Grant controller a thermostat?

@shadowfax good. You have a 4 channel digital programmer, but only one channel, 1, will be used for hot water timing. It's a unit badged up by Grant b...

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

1pm - 2pm daily is a good time 🙂 I have a small 3.6kW solar PV+battery. In summer hot water is free via any morning solar generation stored in the ba...

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

Hi @shadowfax - I’m sure we can help. First, what device controls your hot water timing? Do you have a timer unit like the one on the left here somewh...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: New Build - Grant Aerona3 10kW - Questions and observations

@ggw there should be a manual flow setting and indicator gauge on the system pipework. Grant fit one looking like this. It indicates flow in litres/mi...

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

@roamingbull You running on weather compensation? If the house is too cold when it's milder and warmer outside you may need to flatten the WC curve a ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: New Build - Grant Aerona3 10kW - Questions and observations

@ggw I think you've nailed the issue. Very odd. I think you may have a faulty outdoor temperature sensor probe, if the unit is under warranty this ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Legionella cycle: Heat Pump or Immersion Heater?

I have a Grant ASHP and have the HW output from it set at 60degC for 75 minutes daily. This will charge my 250litre pre-plumb Grant cylinder to 55degC...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Solar Diverter and faulty immersion thermostat = Accidental Sauna ***SERIOUS PROBLEM****

Immersion heater built-in thermostats are not that accurate. Mine is set to 65degC and cuts out when used with a solar PV diverter. However, the tank ...

2 years ago
Forum
Solar Thermal & Power Diverters
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RE: Is the Grant controller a thermostat?

@dodgyknee Yes, I'm wondering, well, hoping, that the homely interface is retrofittable to the Aerona3. The Aerona3 uses RS485 so fingers crossed. I w...

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

We were off mains gas and on oil, so wanted to get rid as the oil boiler was life expired. No regrets about going all-renewable, solar PV+battery and ...

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

@roamingbull it's a lot of faff and trial and error. Partly that's because Grant install dumb systems with no intelligence and rather clunky external ...

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

Hi @roamingbull. Another Grant unit 'commissioned' without WC enabled? There's definitely a pattern here. Grant are still coming out of the dark ages ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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