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Grant Aerona 13KW - can I boost it?

Marvinator80 · 2023-11-29T09:15:34Z

Not really a big issue, more curious than anything. have had a few nights of -5 degrees and I wouldn’t say it’s struggling but it’s not as warm as I’ve seen it before in these conditions. House is ranging between 18.5 and 20.5 depending on the room. Would say 19.5 average. So it’s not cold or uncomfortable. i tried to whack it up to 21 just to see how quickly it would get there in these conditions but its not really. Just maintaining. During the day it will creep up slowly and at night just hold its ground. I did notice that night mode was somehow on and managed to disable that last night. I’m not qualified to mess with the parameters but I did notice that up and down buttons on their own allow you to increase a temperature or sorts but I don’t know what that means. It was at 27 degrees when I first looked at it and I have increased it to see what happens. is there anything else I should be doing? Or is it a case of getting it to a higher base before the cold snaps really strike?

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Air Source Heat Pumps (ASHPs)

Last Post by AllyFish 2 years ago

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Anonymous 5011

(@Anonymous 5011)

Joined: 4 years ago

Posts: 562

15/09/2024 10:32 am

Posted by: @allyfish

↑

total energy bills for a 4-bed all-electric house at under £1K at year,

That sounds cheap - well done. Much cheaper than us.

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Marvinator80

(@marvinator80)

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Posts: 201

Topic starter 15/09/2024 11:08 am

@johnmo I think it’s fairly big.

house itself is 294sqm. Year 1 all good. There had been a debate about whether to install 13kW or 17kW model but with the house being quite efficient and underfloor heating downstairs throughout, the installers plumped for 13KW.

Last year we built a large garage with office/man cave above. Downstairs is 72sqm is currently not heated, although the plumbing is there. The upstairs is 48 sqm and it is heated.

After adding this, the system didn’t deliver comfort temps quite as well. Grant believed the system needed more volume and recommended the external volumiser with immerser. On the original install we had no practicable space for a LLH.

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Marvinator80

(@marvinator80)

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Posts: 201

Topic starter 15/09/2024 11:27 am

Here’s the house after garage built last year.

it has underfloor all downstairs.
8 rads upstairs.
3 additional rads upstairs in the garage.
on the non visible side of the garage roof it has 5.46kw solar array and contained inside the garage is a 10KW battery.

I would like to add more solar and another 10KW of battery storage. Maybe a project for next spring.

👍

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Marvinator80

(@marvinator80)

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Posts: 201

Topic starter 25/09/2024 10:55 pm

We had our first frost proper air frost night last night since the install and all good. I noticed a new icon on the controller indicating the external volumiser/immerser had activated.

house was lovely and warm this morning. All comfort temps comfortably maintained.

one other thought I have ahead of winter is my Delta T. This is currently 6 but I wonder if I can get it to 8. I have the pump speed on the medium setting. If I lower that would I likely get an increment on the delta T?

👍

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AllyFish

(@allyfish)

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Posts: 520

26/09/2024 7:03 am

I know that little icon on the controller! It was popping up for me the other morning when the immersion supplemented defrost. I wouldn’t be remotely concerned about delta T. For Grant units it is up to 8degK, but will often be less on a fixed speed/volume flow system depending on load. Mine sits around 3-5degK normally. Slowing the pump down might drop the system flow a little too low & cause some rads to have insufficient output.

👍

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Marvinator80

(@marvinator80)

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Topic starter 26/09/2024 7:45 am

Thanks Ally 👍

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Marvinator80

(@marvinator80)

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Posts: 201

Topic starter 27/09/2024 9:12 pm

This brings me too much satisfaction.

🫶

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Marvinator80

(@marvinator80)

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Joined: 4 years ago

Posts: 201

Topic starter 11/10/2024 11:25 am

We’ve had a few cold night now. Some nights ranging from 3 at 8pm dropping to -3 overnight and still at -1 at 9am the following morning.

it struggled with this last year. We were coming down to 19 degrees typicallly.

Since the external heated Volumiser has been added it’s been a big difference so far. Comfort temps being met easily. Whole house at 22 and no longer calling for heat when I get up.

It’s set for 21.5 so will go up to 22 before the heating demand cuts off.

👍

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AllyFish

(@allyfish)

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Joined: 4 years ago

Posts: 520

11/10/2024 12:14 pm

This with the 3kW immersion energised during defrost @marvinator80? It's transformed my unit performance when in regular defrost mode. The leaving water temperature doesn't drop like a stone as it used to, by a few degC, which is much quicker to recover from.

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