Cooling with rads you need to worry about avoiding condensation. Think what happens to that glass of cool beer on the 33 degree day.
If you want cooling then look at air to air, depending on the property, including the layout. Air cassette can be a real good option, itâs very typical elsewhere to put in multi split in and add room units as/when you want or can afford it. Youâd be surprised how well hot air heating works on an open plan house.
The UK pays a silly premium for such stuff though.
Adding a single room air-conditioning to Cosy 6 may be best value option.
Thatâs a good point, I had not thought of that.
This was also on my mind, that Cosy6 being ÂŁ4k less than local independent installers would leave plenty of space for a split unit, which we could put into the master bedroom as mainly the cooling is needed upstairs in summer the downstairs is mostly manageable unless there are consecutive 30c+ days (see this week) even if you get up at 5:30am and fling open all the doors/windows to vent the 27c air from the day before.
Other things I am trying to resolve are they didnât seem to be clear a G98/99 was needed. which was strange as MCS Website is clear it is! I am (as usual a problem child) because our 12.5kW ~52A current DNO import limit means if you add worst case 2kW ~8A load (6kW heat pump 3:1 worst case efficiency) then you need 60A.
60A you would think seems reasonable on a 100A fused property, however 60A/13,8kVa seems to be a crossover point in the decision process flowchart.
Its not rocket science, its just hard getting sales to confirm things the technical teams do.
I expect an air-conditioning in upstairs bedroom would cool complete property a little while doors are open.
As we have a bungalow I am thinking of a 160 flexible duct with inline fan from far corner of property INTO the room with air-conditioning and over cooling the air con room overnight. (But we are putting air-conditioning in living room.)
Also the ÂŁ5k will pay for lots of addation battery capacity so make up for a little lower COP on basic Cosy 6 install.
Iâm still slightly put off by the cloud based nature and complete lack of local display/control on the cosy/octopus, would prefer something more âindustry standardâ ideally (see GivEnergy for prime example why local is king).
It might yet come down to if the Mrs wonât accept the ârecycling binâ cosy design!
Cosy is the only heatpump I know with automatic software updates to improve proformane.
They also have one of the lowest maintenence costs. Some of the others needs a service to keep the warranty with the service costing 3 times what I pay for a boiler service and gas safety checks.
Octopus are being evasive on answering about the G99 application, the whole experience is giving me cold feet (pun intended) to be honest.
I think the initial push was probably very good, but doing some more digging they are really just sales people trying to get you to sign up and hand over to install. The install team can then go radio silent for a long time as they are overloaded. You get a lead Octopus technician who is customer focused but they sub-contracted team doing work like the rad changes and possible tank.\
Proâs:
- Price
- Cosy has cheap maintenance plan
- Big company behind the install
- Likely to long term sort out problems
Cons;
- Refuse to quote Daiken
- Pushing Cosy
- Vague qoutes
- Sales evasive on questions
- Information provided is wrong (told one sensor wired, now told all are wireless)
- Need 4 âpodsâ but no one can tell me why. Possible to maintain Zigbee coverage where you need it, only one is master and controls HP. AAA batteries, no display - very little use other than âboostâ button.
- Tied to Octopus cloud (see GivEnergy why this is bad)
- No local control on Octopus Hub, just the app.
- No option to integrate extra monitoring (e.g. ESPTherma on a Daikin)
- Refuse to install flow meter and heat monitor (officially, unofficially yes)
- Just crippled their API removing a lot of useful data
Leaning towards paying more somewhere else for peace of mind to be honest at this point!
There is a VAST difference between âwhat we can doâ on paper and what can be done with coffee, biscuits and maybe a pizza lunch for the installers while they are there.
Officially octopus donât support smart grid integration with a myenergy Eddi, the OEM kit and various other things I am not able to discuss publicly but it all seems to work very well on my octopus setup (after a full reinstall due to sizing issues).
To their credit they did put it all right and pay for it so canât complain.