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Last seen: Oct 26, 2026
@ian33a I recently did a heat loss calculator spreadsheet based on gas usage over a cold period in winter e.g. January. I'm sure you could easily ad...
@bobflux The hydraulic simulator is very interesting. I don't know if I can give you enough information to do a reasonable model of our heating sys...
Changing the 15mm pipe would be very disruptive and no doubt expensive, so I don't want to go there. As an alternative, I would be happy to compromi...
Posted by @jamespa There are a couple of possible installer parameters namely conf heat build pump, unit %pwm, default auto, but can be set 50%-100...
Post by: @robs Is the pipework the original, like the radiators? Also, your calculated pressure drops seem quite low. Thanks for the tip abo...
@jamespa The DT will be what the DT will be, its determined by the equations you set out above. This means that most of the time (with a constan...
@jamespa Thanks for the feedback, the pipe work is 22mm to the airing cupboard where the hot water tank is situated, and then disappears off into in...
Just read this excellent RHH article that suggests a good solution Heat pumps that support a variable or adjustable delta T (dT), for example 7 ...
I’ve thought about the pipework and flow rate issues from first principles and tried to work out what will happen as follows: Basics 1 Kg of wate...
Post by: @old_scientist The first thing I would say is don't get too hung up on matching radiator output exactly to the room heat loss - heat will ...
@kilgorexv There is a simple rule of thumb by Michael De Podesta that is: Heat loss = Annual gas usage x Design temperature difference / 57.3 Fo...
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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 , 2 hours 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 , 15 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...
By EtchedPixels , 3 days ago
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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. ...
By bobflux , 5 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 , 5 days ago
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RE: Forum updates, announcements & issues
Get the Renewable Heating Hub heads-up on WhatsApp. I...
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