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AndrewJ
@andrewj
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Joined: Jan 8, 2025
Last seen: Oct 13, 2026
Profile Activity
Topics: 12 / Replies: 237
AllTopicsReplies
Topic
Is the "divide by 2900" rule still valid?
2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Replies: 4
Views: 416
Reply
RE: Do I add Air Con or MVHR to existing A2W ASHP?

@watcher actually, a picture from inside the living room on a sunny day and cloudy day, at midday, with the shutters open would be very useful. What ...

2 months ago
Forum
Air-to-Air Heat Pumps & Air Conditioning
Reply
RE: Do I add Air Con or MVHR to existing A2W ASHP?

@lizzie that is useful info, thanks. I’m currently considering external shutters to try and reduce solar gain as our house typically heats up to over...

2 months ago
Forum
Air-to-Air Heat Pumps & Air Conditioning
Reply
RE: Starting Our Heat Pump Journey: 1962 build 3 bed detached house

@ian-s I too can provide some insight. We have a Cosy 9 along with 10kW PV and 16kW of battery, 8kW inverter plus an EV. The batteries are charged u...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Starting Our Heat Pump Journey: 1962 build 3 bed detached house

@ian-s that would point to a 5kW heat pump being sufficient assuming you want the same temperatures across the house. These ought to be considered 15...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Starting Our Heat Pump Journey: 1962 build 3 bed detached house

@jamespa I used 9MWh of gas but the heat loss was originally calculated at around 8.5kWh and a 9kW heat pump installed. It was subsequently recalcula...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Starting Our Heat Pump Journey: 1962 build 3 bed detached house

For some reason, never explained, Aria use a buffer. However, it would also seem they know what they are doing and it doesn’t cause issues. Probably...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Octopus Cosy Heat Pump Owners & Discussion Thread

Did you see the post on Facebook where an air conditioning module, plumbed into the wet circuit and powered by the Cosy was shown? Only a prototype a...

3 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Can DNO change a G99 export allowance once approved?

It never takes much to drag something off-topic. At least this forum never succumbs to Godwin’s Law!

3 months ago
Forum
Electricity, Tariffs, Monitoring, Electrics & Providers
Reply
RE: Can DNO change a G99 export allowance once approved?

@transparent It seems to be designed that way - from their support page: ..... Pen Fault Detection A PEN fault refers to a problem with the prote...

3 months ago
Forum
Electricity, Tariffs, Monitoring, Electrics & Providers
Reply
RE: Can DNO change a G99 export allowance once approved?

@transparent I'll try and answer this as best I can. My house looks like your TN-CS (PME) image: there is an earth lead directly back into the servi...

3 months ago
Forum
Electricity, Tariffs, Monitoring, Electrics & Providers
Reply
RE: Can DNO change a G99 export allowance once approved?

@tim441 They did that last year: fitted a voltage recorder for a week and then took it away to analyse the data. They agreed that it was reaching vol...

3 months ago
Forum
Electricity, Tariffs, Monitoring, Electrics & Providers
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