Depending on which part of their website you read, it appears that Daikin is not yet supported.

"Havenwise is currently compatible with Vaillant, Mitsubishi, and Samsung. We also hope to launch Daikin soon."

It appears Daikin is a closed alpha test, so it's not something you can join to test this.
I have had a look at this in the past, and because I too have a Daikin ASHP I've ignored it.

In theory, once you turn off the scheduling for both heating and hot water, and let the system 'learn' how your house heats and cools, and how your hot water heats and cools, it will 'optimise' it based on your comfort settings for time of day for each.

That said, it won't have integration to things like your solar batteries, so if it is messing about with turning off and on at weird times, you may find it interferes with how you want to manage those batteries, if you have them.

The savings listed on the website compare an optimised heat pump to a gas boiler (as stated in the fine print). That's a bit disingenuous to my mind.

I'm not personally convinced this can do that much to improve things, but I'm happy to be proven wrong. Unless it can control the ASHP at a low level, it isn't entirely clear how it makes the magic happen. Adjusting schedules and the temperature targets doesn't magically change physics. Sure, using your own house as a unique definition so it knows how it cools down, plus weather compensation and locally accurate weather forecasts, can make a small difference. But it would be tiny to my mind.

It's £50 plus VAT per year, so really it's a case of whether you believe it can save you £60 on your electricity bill. If you think it can, then it's worth a punt if your heat pump manufacturer is supported. As the first 3 months are free, I guess there's no real risk in trying it out.

 

Is this similar to Homely - Homely: The smart controller of choice designed for heat pumps
That's a third-party system which integrates with heat pump and makes it better. A friend has it (but they've had it since install, so I guess they can't really compare a before and after).

I think it has a hardware component that interfaces to the heat pump? And its own room thermostat.

 

I missed the £50 cost.

And my expectations are similar @dirk362. Seems like a fancy speak, but no real info or specifics.

Thanks @divenal, I will have a look at this. The havenwise states that there is no hardware component, only an app.

 

Don’t waste your time or money….. it’s just a modbus flow temperature controller, really.

Yes it will allow you do load compensation on top of weather compensation to recover from a setback, but that’s not really required if you don’t have a setback in the first place (we don’t).

Stick with weather compensation and a hi-limit stat would be my suggestion.

 

Daikin provides load compensation built in, or at least the Altherma Monobloc does, which is perhaps the most common range that gets installed.
The Daikin default is 5, and Octopus tend to leave it at 5. The setting has a range of 0 to 10C.
It was my understanding, perhaps erroneously, that you can use this in tandem with any setback (if any) to try to improve efficiency.

I've not yet turned my heating on this year, so I don't have anything recent to share. But last winter, I was running with 20C during the day (04:30 to 21:30), and 18C as a setback overnight (21:30 to 04:30). The timing of 04:30 was to ensure any DHW schedules had completed, and to leverage the IOG off-peak to get the ASHP and house up to temperature.

Last year, I left the compensation at 5, and tried it for a while at 10, thinking the largest delta would provide the greatest opportunity for efficiency.
I think I got that wrong, and instead I should have been targeting something at or around the setback delta. So this year, I am going to initially set the load compensation to 3C and see how that works out.
I still want to try and achieve a 'set and forget' set of parameters to cover all heating, as I'm not wanting to tweak things to the nth degree across the varying levels of coldness in winter. So it will never be perfect, but 'good enough' efficiency is fine by me.

 

Wow, I have been heating for the last couple of weeks. Mostly overnight, 00:30 to about 7 or 8am, depending on work.

What do you mean by "load compensation"? I think I have something called "modulation", that is currently set to 10degC, and it is supposed to allow the ASHP to modulate up or down of the set LWT, when matching the room temp. I'm not sure I understand it all yet.

Edit: it is good that I checked. In my current settings, DeltaT is 10degC. Modulation is enabled and set to 5degC.

 

Wow, I have been heating for the last couple of weeks. Mostly overnight, 00:30 to about 7 or 8am, depending on work.

What do you mean by "load compensation"? I think I have something called "modulation", that is currently set to 10degC, and it is supposed to allow the ASHP to modulate up or down of the set LWT, when matching the room temp. I'm not sure I understand it all yet.

Edit: it is good that I checked. In my current settings, DeltaT is 10degC. Modulation is enabled and set to 5degC.

Modulation at 5°C means your installer has not changed that, as it's the default value from Daikin.

DeltaT of 10°C is usually controlled by the Heating Emitter setting. The type defined there sets the DeltaT (via a calculation made). Or at least that is what I was told by the Octopus engineers who installed my Daikin system.

I have radiators, but the Heating Type for the Main Zone is set to Fan Coil, as that reduces the DeltaT and helps with efficiency, as the delta between flow and return isn't so large to maintain - pages 158+159 of the installer manual cover this, and pages 162+163 on Modulation.

Edit: Whether a DeltaT of 10°C is 'correct' for your installation will be based on your heating system, such as if you have any underfloor heating, and also if you have an additional zone defined.
Personally, unless you've got something fairly complicated, 10°C for DeltaT seems high to me, and possibly suggests one or more settings isn't optimal for your heating setup.

If Heat Emitter is set to Fan Coil, DeltaT will be 5°C, and if radiator, it would be 7°C.

Edit2: Until the average ambient daytime temperature inside my house drops to 18°C or below for more than 1 day, I am not going to turn the heating on. I'll just wear another layer for the odd colder day. It is getting close at 18.5°C regularly over the last week or so colder spell down here in West Sussex, but it hasn't hit the magic trigger for me to turn on the heating. Because once I do, it will be left on at 20°C daytime, 18°C overnight, until Spring.

 

No underfloor heating.
Single main zone.
The system is set to fancoil, but in reality I have all rads.

And, just today I read in the octopus handover doc: "measured ∆T leaving and entry: 5°C".

So, I will need to see about this.