If people download the Havenwise app, create an account, and select Daikin as their manufacturer, they are automatically added to our wait list. And they'll receive a message when they are invited to complete the onboarding. 

The analysis compares how Mitsubishi Electric, Samsung and Vaillant systems behave once they’re installed in real British homes.

Looking at the data side by side raises some genuinely interesting questions about performance, measurement and what “good” actually looks like in practice.

Just an evidence-led look at what the numbers do (and don’t) tell us.

That is quite concerning as I have a Samsung Gen 6 in our current house and have just had a Gen7 R290 installed in what will be soon be our new home.  I had the choice of Vaillant or Samsung from the plumbers with the Vaillant being quote over £1000 more. I choose the Samsung on cost and after reading quite a lot on the Open Energy Monitor forum from people who have them and have taken the time to set them up well and I expected it to be similar to run to any other well set up HP.  I have a Homely installed on the Gen 6 and intend to use the same in the new house. I am hoping that Homely will run it as efficiently as possible but from your video that isn't necessarily the case, or at least not with Havenwise.

What I suspect is going on is some extra automated behaviour kicking in under Holiday Mode, perhaps slightly more frequent circulation to keep things from freezing, a periodic DHW anti-legionella cycle (even though I think this one is unlikely) or the app’s optimisation applying a different flow temperature curve or pump logic that’s less gentle than your manual setting.

Another factor could be timing: looking at the dates (Jan 16-22), the big spikes line up with what might have been a colder snap mid-period. Maintaining even 16C during that would naturally cost more than the milder earlier days at 18C. Just speculating here.

Either way, the manual approach clearly came out on top for a short holiday like this. For longer trips, Holiday Mode is still handy for proper protection, but next time it might be worth sticking with a manual setback or just monitoring the app closely for the first day after switching modes.

Curious to hear how it goes if you experiment again, and wonder if other Havenwise have experienced similar things in Holiday Mode.

So.. I’m currently on holiday. The 1st few days I lowered the target temperature to 18c.

The daily cost of this was under £1 a day.

I decided to change the setting of the heat pump to holiday mode. As the graph shows it was clearly a wrong decision as the daily cost shot up by over 300%.

have to say I’m rather surprised by this. Is there anything that I could be missing here?

The analysis compares how Mitsubishi Electric, Samsung and Vaillant systems behave once they’re installed in real British homes.

Looking at the data side by side raises some genuinely interesting questions about performance, measurement and what “good” actually looks like in practice.

Just an evidence-led look at what the numbers do (and don’t) tell us.

Full video here: https://youtu.be/pOtjo_4rINU

Yes the PAR 60 is working, but HW have revealed an aspect that I would have liked to have known earlier, i.e. that it has a granularity of    +- 0.5 C and that this is is not ideal for their control.

HW eventually suggested that I should use a Shelly H & T Gen 3 rather than the PAR 60, but having purchased and paid for the installation of the PAR 60, I wanted to persist with it. 

Our main living rooms are upstairs and South facing, whereas our master bedroom and family room/ office are North facing. This (and perhaps smaller than ideal radiators downstairs), dictates location of the PAR 60 in the downstairs bedroom.

I have subsequently bought 4 more Shelly H & T's just to monitor temperatures in upstairs and downstairs rooms and in recent weeks, the system is maintaining reasonable control with a temperature difference of 2C across 6 rooms, so perhaps the system is learning how to deal with the perceived deficiencies of the PAR 60.

However, I am quite undecided, because I don't recall having similar difficulties last year, when operating on weather compensation as opposed to managed adaptive.