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Old_Scientist
@old_scientist
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Joined: Jun 16, 2024
Last seen: Mar 4, 2026
Profile Activity
Topics: 6 / Replies: 352
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RE: Oversized 10.5kW Grant Aerona Heat Pump on Microbore Pipes and Undersized Rads

@uknick No Open Energy Monitoring here I'm afraid. I do have a MID electricity meter fitted that records ASHP electrical usage (a bit like those used ...

2 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Oversized 10.5kW Grant Aerona Heat Pump on Microbore Pipes and Undersized Rads

I'm torn on this. The issue I see is that when one performs a retrofit (heat pump installation onto existing heating system), the installer often has ...

2 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Oversized 10.5kW Grant Aerona Heat Pump on Microbore Pipes and Undersized Rads

Out of interest, I've just had a look back at my radiators spreadsheet, and at a flow temp of 35C (which is as high as we are ever going to run), my l...

2 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Oversized 10.5kW Grant Aerona Heat Pump on Microbore Pipes and Undersized Rads

My heat pump is maybe 3 times oversized on paper being a 12kW unit and my heat loss to date has been around 4kW, although we do not heat the house to ...

2 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Oversized 10.5kW Grant Aerona Heat Pump on Microbore Pipes and Undersized Rads

Following on from @jamespa excellent answer(s), it really all starts with the heat loss figure. If you know the heat loss for the property (and even b...

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

@papahuhu Yes, a net metering tariff where import and export are the same price seems a bit of a paradox where import prices are rising at the same ti...

2 weeks ago
Forum
Electricity, Tariffs, Monitoring & Providers
Reply
RE: Electricity price predictions

@Toodles Agreed. Perhaps I'm too much of a perfectionist, always trying to squeeze that last couple percent performance out of the system. However, th...

2 weeks ago
Forum
Electricity, Tariffs, Monitoring & Providers
Reply
RE: Electricity price predictions

Yes, I'm guessing it was kind of easy (less costly) for them to delay until 1st March as I imagine most people are not exporting any significant amoun...

2 weeks ago
Forum
Electricity, Tariffs, Monitoring & Providers
Reply
RE: Electricity price predictions

Me too. Another reason to consider IOF in summer, now effectively paying double SEG rates for export? I've not seen anything (yet) about IOF rates cha...

2 weeks ago
Forum
Electricity, Tariffs, Monitoring & Providers
Reply
RE: Tell us about your Solar (PV) setup

@upnorthandpersonal thank you for sharing details of your home - I thoroughly enjoyed reading your blog posts about your off grid home. Very impressiv...

3 weeks ago
Forum
Solar Photovoltaic (PV)
Reply
RE: PV export revenue and HMRC

Indeed, but HMRC subsequently rejected their claim and ruled that all income from Ripple was taxable as they failed the first test listed above: 1. ...

3 weeks ago
Forum
Solar Thermal & Power Diverters
Reply
RE: PV export revenue and HMRC

Yes, of course the total income from export could be greater than £1,000, so we need to understand if import costs for arbitrage are allowable expense...

3 weeks ago
Forum
Solar Thermal & Power Diverters
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