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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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Reply
RE: Combustion Source Heat Pump?

I like the thinking outside the box. Air source heat pumps are designed to take enthalpy (the energy state of outside air) at fairly low levels, trans...

3 years ago
Forum
Wood Burners, Biomass, Small Scale, Biofuels & Other Heating Alternatives
Reply
RE: 17kw Grant Aerona heat pump not performing

The Grant low loss header is a decent bit of kit, but Grant bizarrely don't put flow monitoring and adjustment gauge on primary and secondary circuits...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: 17kw Grant Aerona heat pump not performing

@soniks I think they are sometimes not wired up on the Grant installs. Mine was, but I recall the installer saying he was not supposed to enable it us...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Does our solar generation sound about right?

@lfranklin used to divert excess solar PV generation into a system hot water tank via the 3kW immersion. About £350-400. Friends with them have said t...

3 years ago
Forum
Solar Photovoltaic (PV)
Reply
RE: Does our solar generation sound about right?

@lfranklin ah, yes, you'll need a smart meter for Cosy. My PV export tariff is 'Outgoing Octopus 12M fixed' their standard 15p/kWh fixed arrangement. ...

3 years ago
Forum
Solar Photovoltaic (PV)
Reply
RE: Does our solar generation sound about right?

Have you got a variable rate tariff and have scheduled the Growatt battery to charge during cheap rates to supply during standard and peak rates? It's...

3 years ago
Forum
Solar Photovoltaic (PV)
Reply
RE: Retrofitting: moving to ASHP old oil boiler in large old property - experience/advice please on MSC calcs

@katcesca what flow temperature has your MCS estimate based and sized the design on? This is THE most fundamental element of an ASHP efficiency and th...

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

@marvinator80 you got lucky on the SAP EPC lottery! I went up from a D to a C. My heating and hot water scores both went DOWN after ASHP and solar wit...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: This does not make sense - documents needed for EPC score

@mike-patrick - click on 'document' @ronin92 - clearly whoever is in charge at the BRE and tasked with preparing the SAP methodology for heat pump e...

3 years ago
Forum
Solar Photovoltaic (PV)
Reply
RE: Our Grant Aerona R32 13kW ASHP installation

@marvinator80 ahhh, right, check the cylinder stat. Here's the info for that stat in Appendix A p.30. When the stat is demanding heating, the green LE...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Yearly maintenance

@hughf refrigerant charge quantity is critical. The best place to charge the unit is in the factory when built, where equipment is calibrated and cont...

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

I would use the ASHP for HW generation, as, even accounting for the fairly slow pre-heat time when the flow through the ASHP cools a bit before warmin...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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