Sean Hood
@snhd.co
Get paid to keep servers happy. Hobby collector: Lazy photographer, gravel rider, cider drinker, home automation tinkerer, VW owner, passivhaus/retrofit enthusiast, lurcher & greyhound owner; not all at the same time.
snhd.co
📍Sheffield, UK
snhd.co
📍Sheffield, UK
+1. I regularly think back to his talk at #cfgmgmtcamp: “Why your config should have a schema”
October 21, 2025 at 9:21 AM
+1. I regularly think back to his talk at #cfgmgmtcamp: “Why your config should have a schema”
Idk if you have checked this map: openinframap.org may have some info (or none at all)
Open Infrastructure Map
Open map of the world's electricity, telecoms, oil, and gas infrastructure, using data from OpenStreetMap.
openinframap.org
September 22, 2025 at 1:37 PM
Idk if you have checked this map: openinframap.org may have some info (or none at all)
Going to do some testing. Saved this chart for my boiler currently pump speed 2. Already very different from the first chart top of thread. Maybe due to outdoor temps in Jan?
Is there a calculation to translate heat loss at ODT to heat loss at a different temperature? i.e. 4.2kW @ -3.3 == nnkW @ 6c
Is there a calculation to translate heat loss at ODT to heat loss at a different temperature? i.e. 4.2kW @ -3.3 == nnkW @ 6c
September 22, 2025 at 7:43 AM
Going to do some testing. Saved this chart for my boiler currently pump speed 2. Already very different from the first chart top of thread. Maybe due to outdoor temps in Jan?
Is there a calculation to translate heat loss at ODT to heat loss at a different temperature? i.e. 4.2kW @ -3.3 == nnkW @ 6c
Is there a calculation to translate heat loss at ODT to heat loss at a different temperature? i.e. 4.2kW @ -3.3 == nnkW @ 6c
I am intrigued by these and also mis-using a2w for slight cooling with normal rads or "heat pump convectors" from Daikin or Jaga, even the likes of: phstore.co.uk/zehnder-comf... based on this post: bsky.app/profile/alan...
Thought it would be a good day to see if easy to switch our ASHP to cooling - turns out it is!
I know radiators aren't going to have enough output at temperatures above dewpoint, so this is just to satisfy curiosity (cycles on/off every 5-10 minutes)
I know radiators aren't going to have enough output at temperatures above dewpoint, so this is just to satisfy curiosity (cycles on/off every 5-10 minutes)
September 20, 2025 at 7:56 AM
I am intrigued by these and also mis-using a2w for slight cooling with normal rads or "heat pump convectors" from Daikin or Jaga, even the likes of: phstore.co.uk/zehnder-comf... based on this post: bsky.app/profile/alan...
In my (very) minimal understanding it's a balance. Too high and heat can't get out of the rads, too low can't get out of the boiler. Could well be boiler is too big and can't operate low enough; 25kW for a house with >5kW heatloss at -3.
September 20, 2025 at 7:42 AM
In my (very) minimal understanding it's a balance. Too high and heat can't get out of the rads, too low can't get out of the boiler. Could well be boiler is too big and can't operate low enough; 25kW for a house with >5kW heatloss at -3.
Was looking into flow rates for combi boilers when I found they usually have a multi speed pump. I had a look at mine and found it was set to 3. I'm suspecting that could be causing this low dT and the cycling. It's going to be colder in a couple days, maybe speed 2 will be better?
September 19, 2025 at 10:46 PM
Was looking into flow rates for combi boilers when I found they usually have a multi speed pump. I had a look at mine and found it was set to 3. I'm suspecting that could be causing this low dT and the cycling. It's going to be colder in a couple days, maybe speed 2 will be better?
Ah great. I came to a similar conclusion for mine. Was looking at the Axioma E4 from @openenergymon.bsky.social. I'll check with them and the heating engineer as I also need a service for this year.
Also, thanks for the video on integrating HomeAssistant with emoncms. Going to be a useful one.
Also, thanks for the video on integrating HomeAssistant with emoncms. Going to be a useful one.
September 19, 2025 at 10:48 AM
Ah great. I came to a similar conclusion for mine. Was looking at the Axioma E4 from @openenergymon.bsky.social. I'll check with them and the heating engineer as I also need a service for this year.
Also, thanks for the video on integrating HomeAssistant with emoncms. Going to be a useful one.
Also, thanks for the video on integrating HomeAssistant with emoncms. Going to be a useful one.
Hey, I recently rewatched the video on you fitting the heat meter. How did you decide on the size (DN20/qp 2.5m3/hr I saw) which needed to be fitted? Considering one but only if it’s useful for now with a combi and then for ASHP later
September 19, 2025 at 9:06 AM
Hey, I recently rewatched the video on you fitting the heat meter. How did you decide on the size (DN20/qp 2.5m3/hr I saw) which needed to be fitted? Considering one but only if it’s useful for now with a combi and then for ASHP later
AirPlay 2 added this in 2018 I think. Although some apps (and system audio on a Mac will still default to AirPlay 1).
Main reason I have HomePods, although my new Arylic LP10 also supports AirPlay 2 and multi room between it and a HomePod.
Main reason I have HomePods, although my new Arylic LP10 also supports AirPlay 2 and multi room between it and a HomePod.
September 12, 2025 at 1:02 PM
AirPlay 2 added this in 2018 I think. Although some apps (and system audio on a Mac will still default to AirPlay 1).
Main reason I have HomePods, although my new Arylic LP10 also supports AirPlay 2 and multi room between it and a HomePod.
Main reason I have HomePods, although my new Arylic LP10 also supports AirPlay 2 and multi room between it and a HomePod.