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Last seen: Oct 26, 2026
Posted by @jamespa Id be tempted to buy and splice in a cheap flow rate meter if I really wanted to be certain. I'll do exactly that, thanks. ...
@cathoderay If the heat pump occasionally over produces some extra heat and the indoor temperature rises accordingly, then that will be captured in ...
@cathoderay I have a suspicion that the minimum output of your heat pump may be a factor in the surprising result shown in your latest graph, regardin...
@jamespa Thanks, its good to have a second opinion on this. I'm definitely in the (a) category of try it and see and only make changes to the pip...
@cathoderay Thank you for trying out the simple heat loss calculation that I suggested, the "HTC method". You have some excellent detailed data, whi...
@jamespa Thanks, you are right. I needed to look at this again. At worst the flow splits into two parallel 15mm pipe runs. I am convinced that as...
@old_scientist If you fall below the minimum flow rate, most ASHPs will simply throw a flow rate error and switch off until the flow rate is increa...
When we first moved into the house, it had single glazing, cavity wall insulation, and about 150mm of loft insulation. If I take all the upgrades out ...
Posted by: @cathoderay All I am doing is emphasising the point that the long term averages used to calculate the HTC must be based on frequent enou...
Posted by: @jamespa Whilst I don't like determining things based on a single measurement point because you don't have a tool to spot errors, I also...
@cathoderay @ian33a The way the calculation works is to determine the Heat Transfer Coefficient (HTC) - the total energy required to keep the indoo...
@ian33a You only need the heat energy in kWh output by your heating system for 1 cold month e.g. January, along with your average indoor temperature...
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Latest Posts
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RE: The Changing Jet Stream Could Challenge UK Air Source Heat Pumps
Posted by: @scrchngwsl "Nothing in our country is de...
By Rob of York , 1 hour ago
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RE: Electrical works for air to air heat pump
Best, honest advice here will come from @ashp-bobba!
By Mars , 2 hours ago
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RE: 15kw pump for 225m2 1990's house - over kill?
@seaviews I have read you latest response re buffer ...
By JamesPa , 14 hours ago
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RE: How will removing the standing charge on gas bills benefit heat pumps?
The BUS grant funding for 2026/27 will run out at the c...
By Rob of York , 1 day ago
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@editor Ouch, sorry to re start the tick. I had assume...
By DavidB , 3 days ago
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RE: Say hello and introduce yourself
@e-a-west as the good Major said, welcome to the forums...
By Mars , 3 days ago
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RE: How much of your renewable and home setup would still work if the internet went down?
Yes I actually have a copy of a tool that whenever a ce...
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RE: Indevolt Batteries UK Support & Info Thread
@editor Hi, To resolve this, please tap on the A...
By Indevolt Tech , 3 days ago
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RE: Double or Triple Glazed Windows?
Posted by: @singlespeed With 9 years repairing windo...
By Rob of York , 4 days ago
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@transparent we’re still running a secure version of PH...
By Mars , 4 days ago
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RE: How quickly would you want/expect heat recovery to take from setback?
Much longer than that here. The heating isn't even on. ...
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RE: Passiv Smart Thermostat - Help & Forum Support
Obviously the weather is changeable but there's a defin...
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