Last seen: Sep 10, 2025
Yes, sorry for any confusion. 10C is sometimes quoted as the temp of incoming mains (being, I presume, roughly the temp underground at the level the ...
another is to fit waste water heat recovery
OK lets go with 6, 8 minute showers at 10l/min. So you need 480l of water at 40C. If you start of with 300l at 48C (a common setting) and mix it wit...
Any heating set up with either variable or low flow temperature does this. In the UK we normally set up boilers to run at a high fixed flow temperatu...
We need to do some energy calculations! Over what period do you need 8 showers and do you know the water flow rate even roughly. We need these numbe...
The ASHP, just like a boiler, can supply water at only one temperature at any time. So it switches between space heating and DHW. There will be one ...
@mars That could be a whole discussion in itself. I don't personally think its simple!
Unless you have a time of use tarriff/economy 7 then the most economical way to heat DHW is when its warmest outside, generally mid afternoon. Howeve...
It can do provided that doing so doesn't exceed the maximum possible output power. That's the basic limitation which it can't circumvent. Your 8.5kW...
In general terms most heat pumps have this kind of characteristic unless output is capped in the firmware to flatten the curve artificially. Do ...
at 8.5p per kWh its probably not worth spending too much time optimising for efficiency unless you want to enter into the top of the SCOPs competition...
Welcome. Firstly looking at individual days is essentially useless, houses have a 'memory' so you can really only make meaningful 'measurements' seve...
Latest Posts
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RE: COP is not the only measure of efficiency
@jamespetts Interesting post, thanks. Here are my thou...
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RE: Who’s Caved and Switched the Heating On Already?
@editor So… who’s given in and turned the heating on al...
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I am pleased to say at 4pm today we have added another ...
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RE: Buffers, hot water and cooling
@jamespa Your reasonably close! Especially with warmer ...
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RE: Renewables & Heat Pumps in the News
To unpack this a little.... 1) how many of us in this...
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@realevil the fans and fan speed / coil size (height, w...
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RE: Mitsubishi Ecodan 11kw Defrosting Issue.
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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....
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RE: Heat Pump SCOPs – The Truth Might Not Be What You Think
@scalextrix Name plate capacity
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RE: Solar Thermal DHW and ASHP
I was originally contemplating a solar thermal installa...
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RE: Solar Power Output – Let’s Compare Generation Figures
My system installed in July 2024 has produced 6.4mWh in...
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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...
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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...
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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 , 3 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!
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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 , 3 days ago
