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Last seen: Oct 24, 2026
Indeed. A good rule of thumb is a ASHP with a highish leaving water temperature (say 50 degrees, which means a delta t (difference or delta, between w...
To which I might add, if you aim low enough, sooner or later you will shoot yourself in the foot. That is what sooner or later the industry will find ...
@julianc - thanks. I agree, but perhaps more often than not, there isn't a real engineer directly involved. My system was in effect designed by ...
That's not the same thing, as your comment makes clear: the 35, 40, 55 etc are arbitrary vaguely ordinal numbers (could just as easily be 3 4 and 5 or...
Normally this forum is an excellent example of what a forum (forum: a place where people can exchange opinions and ideas on a particular issue) should...
@julianc - yes, I had all the calculations assumptions etc, room by room and total heat loss at -2 outside/design temps inside, and the problem is tha...
@oswiu - this is something that has come up before (Ecodans having better low temperature performance than Midea units). This is precisely why I sugge...
I agree. I have previously suggested that as it currently operates, MCS is a waste of space. At the very least, they could add realistic ie cold weath...
Very good, I think that will be a hard one to beat!
Using @derek-m's formula and my numbers for the last hour, I get (23.3 x 60 x 5)/1167 = 5.99kWh, giving a COP of 2.995 (3 decimals places not because ...
Yes, the formula is easy, but the measuring is not! Neither the flow rate not the LWT/RWT are constant, they vary continuously. That said, I have noti...
@batalto - I agree, I too have noticed the curiously always whole number kWh numbers (the ambient temp does however have decimals). I suspect both the...
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RE: New Build 3 Phase or 1Phase
Not so. 1: It's now the case that the Service Fuse wi...
By Transparent , 8 hours ago
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RE: How will removing the standing charge on gas bills benefit heat pumps?
I think it has an enormous impact on air/air users. The...
By EtchedPixels , 15 hours ago
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@editor Ouch, sorry to re start the tick. I had assume...
By DavidB , 1 day 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 , 1 day 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...
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RE: Double or Triple Glazed Windows?
Posted by: @singlespeed With 9 years repairing windo...
By Rob of York , 3 days ago
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@transparent we’re still running a secure version of PH...
By Mars , 3 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. ...
By bobflux , 4 days ago
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RE: Passiv Smart Thermostat - Help & Forum Support
Obviously the weather is changeable but there's a defin...
By Singlespeed , 4 days ago
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RE: The Changing Jet Stream Could Challenge UK Air Source Heat Pumps
@rob-of-york I must admit that when we had a Daikin hea...
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RE: Forum updates, announcements & issues
Get the Renewable Heating Hub heads-up on WhatsApp. I...
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RE: Safety study for plug in batteries out to tender - looks like Q3 2027 at best before legal
@editor I pointed out to the one of the Fuse execs that...
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RE: 15kw pump for 225m2 1990's house - over kill?
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