
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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RE: COP is not the only measure of efficiency
@toodles Your use case is indeed very different to mine...
By jamespetts , 3 hours ago
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RE: Anyone still weathering it out with Agile?
@toodles I guess it all comes down to import averages. ...
By Tim441 , 3 hours ago
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RE: Who’s Caved and Switched the Heating On Already?
Hell no, October as a matter of principle. If I had my ...
By Old_Scientist , 3 hours ago
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RE: Renewables & Heat Pumps in the News
@mike-patrick Well, if Europe is stalling partly due to...
By Toodles , 3 hours ago
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RE: Buffers, hot water and cooling
Seems a lot of work with hit or miss results and potent...
By dgclimatecontrol , 4 hours ago
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RE: Mitsubishi Ecodan 11kw Defrosting Issue.
@dgclimatecontrol I have no intention of removing the...
By Morgan , 4 hours ago
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RE: 300 Liter Tank - Do I have to heat it all?
The size of DHW tank affects the anti-legionella cycle....
By Transparent , 4 hours ago
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RE: Heat Pump SCOPs – The Truth Might Not Be What You Think
@scalextrix Name plate capacity
By HCas , 7 hours ago
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RE: Solar Thermal DHW and ASHP
I was originally contemplating a solar thermal installa...
By jamespetts , 8 hours ago
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RE: Solar Power Output – Let’s Compare Generation Figures
My system installed in July 2024 has produced 6.4mWh in...
By jamespetts , 8 hours ago
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RE: Vaillant aroTherm Plus 10kW thoughts?
Good unit. And the 10 kW is the same as the 12 kW I ...
By HCas , 1 day ago
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RE: A Customer's Lessons Learnt from a Heat Pump Installation in a Large House
@judith thanks for your suggestions. Starting from col...
By GrahamF , 1 day ago
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RE: Inventor (Midea) Heat Pump short cycling advice
I switched to "fan coil mode" to be able to set water t...
By immunity , 1 day ago
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RE: DESNZ doing a survey which asks the right questions!
Without a survey their only source of data is probably ...
By JamesPa , 2 days ago
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RE: Can you help with our research: solar panels, EV chargers, home batteries, heat pumps?
Just done your survey!
By Judith , 2 days ago
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RE: Failing heat pump system - seeking thoughts on a rebuild
@cleardene-ashp just thinking about your issues here. Y...
By Judith , 2 days ago
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RE: Midea ASHP – how to set weather compensation
@cathoderay OK let's wait and see, it sounds an interes...
By Tasos , 2 days ago
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RE: What is the Heat Geek Guarantee?
@judith, I’m with you on Heat Geek, but there really do...
By Mars , 2 days ago
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RE: Electricity price predictions
Community energy installations are a great idea, but th...
By Scalextrix , 3 days ago