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Last seen: Mar 16, 2026
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...
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...
@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...
@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...
@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. ...
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...
@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...
@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...
@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...
@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...
@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...
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...
Latest Posts
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RE: Octopus Cosy Heat Pump Owners & Discussion Thread
To be fair to Octopus customers, it would be better if ...
By AndrewJ , 7 hours ago
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RE: Seeking ideas / information / commiseration - Pure Drive
Most of the times whole house backup can't work without...
By bobflux , 7 hours ago
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RE: Home energy storage & battery register
AC coupled Pure Drive 10kW battery Solar PV Solis P...
By Little Lights , 9 hours ago
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RE: Rate the quality of your heat pump design and installation
@claireisamazing, that’s got to be one of the most posi...
By Mars , 9 hours ago
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Got myself in a pickle. I have two types of plugs, but ...
By David999 , 10 hours ago
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@jamespa Great, thanks - I've had a quick look at the a...
By Little Lights , 12 hours ago
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RE: Air source heat pump roll call – what heat pump brand and model do you have?
Forum Handle: ispookie666 Manufacturer: Vaillant Mo...
By ispookie666 , 12 hours ago
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RE: A2A vs A2W: Which Heat Pump Would You Pick?
I'm fairly new to the forum and have not voted. Back...
By ispookie666 , 13 hours ago
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I am seeing an increasing number of occasions when my G...
By DavidAlgarve , 14 hours ago
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@transparent I have been a little reluctant to select "...
By DavidAlgarve , 14 hours ago
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RE: End-of-Life Heat Pumps: How Do You Dispose of an ASHP in the UK?
@editor Thanks Mars. I look forward to the subsequent ...
By DavidB , 19 hours ago
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RE: Anyone concerned about GivEnergy?
Fair enough. Its interesting that opentherm (for boil...
By JamesPa , 19 hours ago
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RE: Brand and installer questions for ASHP
A tank solely in the return (upstream of where the retu...
By JamesPa , 19 hours ago
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RE: UK DIY Battery: SEPLOS 48V 200Ah x2 + Sunsynk 8K – Safe Installation for Garage Conversion
thank you to all who have already replied. I have been...
By madsid , 21 hours ago
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RE: Home automation and the cloud; is there a better way?
+1 It's not just cloud though. Many devices have repla...
By bobflux , 1 day ago
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RE: Summer usage. Why is my Vaillant Aerotherm using so much energy on "heating"?
So the red bars are 'DHW' and the yellow bars 'heating'...
By JamesPa , 2 days ago
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RE: Indevolt Batteries UK Support & Info Thread
Have you tried cutting the grid feed to see what actual...
By JamesPa , 2 days ago
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Contractors pack for inta antifreeze valves are around ...
By ASHP-BOBBA , 2 days ago
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RE: Renewables & Heat Pumps in the News
Critics and naysayers will be negative whatever the gov...
By JamesPa , 2 days ago
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RE: Microbore heat pump installs
In principle you are almost certainly right, but in pra...
By JamesPa , 2 days ago
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RE: Electricity price predictions
@old_scientist We are a low mileage home, so bulk of ou...
By ChandyKris , 2 days ago
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RE: What is the main ‘dictator’ of Agile’s unit price?
@toodles I keep an eye on wholesale prices and energy m...
By ChandyKris , 2 days ago
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RE: Upgrading my system, how far do I go?
For comparison, my PW3 with 11.04kW inverter, will char...
By Old_Scientist , 3 days ago
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RE: Changes to Tesla Powerwall Charging Regime?
Elon gate - legendary! I take my hat off to you @toodle...
By Old_Scientist , 3 days ago
