Last seen: Feb 11, 2025
What's funny is the heat pump says its only using 21kwh a day but I know our normal use is around 10, so any idea where the remaining 20kwh might be b...
You can do some ballpark maths to see if it is doing OK. E.g. if the outside temperature is -2 over a 24 hour period and your flow temperature was 4...
Cycling might happen if it is controlled by a room thermostat. The heat pump runs hard (and noisily) to get to a high +40 LWT until the room stat stop...
Yes, you would need to reduce the pressure to the correct value for your system (usually 1 to 1.5 bar when cold). And as @jamespa says, disconne...
The heat loss differs depending on the pipe diameter (and flow temperature, presumably). Here are some of the numbers I could find: 15mm 7.89 W/m22m...
Something similar happened to me once with a gas system boiler. The filling loop hadn't been closed properly and it was pushing up the pressure over t...
I guess I'm wrong about the efficiency but the sound power level of the Grant is 65 dB vs 54 dB for the Vaillant and 52 dB for the Logic. More than 10...
I'm far from an expert, @dorkypark, but my understanding is that openings like air bricks are only an issue if within 1m of the bottom of an R290 heat...
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Heat Pump Dramas?
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Latest Posts
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RE: Heat Pump Sizing & Installation Costs
Perhaps useful to have installed date too? To get conte...
By Tim441 , 57 minutes ago
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RE: What is the best strategy for operating a very oversized heat pump?
Something else... that works for some people... LG ha...
By Tim441 , 1 hour ago
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RE: Newbie out of her depth – Samsung AE120RXYDEG 12kW heat pump
OMG, the attached schematics (even with incorrect room ...
By BAMi , 2 hours ago
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RE: Setback savings - fact or fiction?
@cathoderay I see you are continuing to misquote from t...
By SUNandAIR , 2 hours ago
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RE: Samsung Gen 7 R290 12kW is not behaving how I expected
So I turned my thermostats down last night And w...
By Joshua , 3 hours ago
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RE: SolarPV tables / online calculator
I'd be interested what others find whilst using that we...
By Majordennisbloodnok , 3 hours ago
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Volumisers in Heat Pump Systems: Does Placement Matter?
The debate over buffer tanks in heat pump systems has b...
By Mars , 4 hours ago
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RE: F.788 Building circuit pump reports internal fault - Vaillant Arotherm
Guess I have to wait for engineer visit. I really hope ...
By jeegnesh , 15 hours ago
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RE: Act now to defer the UK road tax increase on EVs
@majordennisbloodnok Damn right sir. my attempt at iron...
By Jancold , 18 hours ago
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RE: ASHP and heating issues in new build house
That’s good gives you more capacity. It made me think, ...
By Terry1812 , 19 hours ago
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RE: Seewet manhole cover within r290 exclusion zone
Thanks! I asked Vaillant, and they say I should be fi...
By dbrb2 , 22 hours ago
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Looking for the Grant Aerona 3 setting to turn off completely at 20 OAT
I'm running my Aerona 3 on WC and the 'warm end of that...
By damonc , 23 hours ago
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RE: Do I just go with the lowest quote for my heat pump?
So after signing in Sept in two weeks the install may s...
By Jancold , 24 hours ago
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RE: Victorian Semi Retrofit / Extension ASHP and UFH Advice
When you are renovating is always a good time, as it ma...
By JamesPa , 1 day ago
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RE: Just one room not reaching desired temperature
Looks like this issue is now resolved. Aira installed a...
By ChandyKris , 1 day ago
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There have been several people on the OpenEnergyMonitor...
By RobS , 2 days ago
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RE: Say hello and introduce yourself
Good point @jamespa But that probably strengthens @ch...
By Transparent , 2 days ago
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RE: Towel rails. An unexpected final hurdle
@jamespa Beware; the use of the term ‘WC’ might lead to...
By Toodles , 2 days ago
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RE: Visit a Heat Pump sessions.
Congratulations @toodles, that's a fantastic result. We...
By Old_Scientist , 2 days ago
Latest Topics
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Heat Pump Sizing & Installation Costs
By Mars 3 hours ago
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Volumisers in Heat Pump Systems: Does Placement Matter?
By Mars 4 hours ago
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SolarPV tables / online calculator
By MichelleC 11 hours ago
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Samsung Gen 7 R290 12kW is not behaving how I expected
By Joshua 23 hours ago
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By Toodles 2 days ago