Long one I’m sorry🙂
I dabbled with quiet mode a while back.
Daikin Anthems 3, 8kW btw.
Didn’t seem to do much TBH.
After the early January cold snap - around 0°C or below at night and barely above 0 day temps, we’ve had warmer weather and I decided to try ‘Most Quiet’
Typical temps have been 3-5°C at night and 7 - 10°C day temps.
Most Quiet has been nothing short of a revelation!
Having logged night and day temps and COP per day for ages, I can easily compare previous similar temperature conditions days/night going back v resulting COP.
Previously the typical daily COPs at around 3°C night and around 8°C day temps were all below 4.
Dropping further to ~3.5 when colder spells came.
Even back in Oct / Nov when temps were higher I was struggling to get much above 4.2, occasionally higher, but rarely.
With Most Quiet enabled I am now seeing COPs above 5 on the warmer of those temp variations and very high 4s on the colder days.
DHW runs hardly have any impact on daily COP! Before they would have lowered it by around 0.8.
Right now it’s 8°C outside according to the temp sensor. The flow temp is 31°C. Room temp 21.7°
I expect tomorrow morning when I read off the input Vs output for today, the COP will be over 5.
This is with a heatpump that the MCS calcs somewhat over egged for the property!
I reckon most of the time we could get by with a 4kW or less heatpump in this house.
It seems Most Quiet is giving me something of the efficiency scaling the system otherwise seems to lack!
Ramping the compressor more slowly? Throttling fan speeds?
What else could it be?
The manual says at or below 0°C outside temp - not to use Most Quiet as it will restrict efficiency enough to risk not heating the house sufficiently.
They don’t mention other drawbacks or risks.
I will switch to Quiet or perhaps Quieter mode when 0°C comes around.
The weather looks set for similar plus temps going forward for quite a while = good winter COPs.
I wonder what it will do for the warmer Spring / Autumn days and even the summer months runs of DHW only?
