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Daikin - they don't currently do a Cost unit that's a high enough output for house size.
Honestly, their spec was terrible. They suggested 50 deg flow rate to avoid having to replace lots of radiators. They didn't consider the relocation of the water tank and required flow rate and from an install perspective, were looking to box in pipes along skirting rather than lift carpet / floor and do a proper job.
Soul
Fox
Sorry Octopus pissed you around. Were you down to have a Daikin or one of the 'Cosy' 6kW units?
The tech in the Cosy units is meant to be good because they're designed by Jason Cassells who Octopus poached from Red, and who pioneered heat pumps which can reach super high flow temps, which is good for true retrofit. But if you don't need that they don't make sense and I can't get my head past how they look - the Red units look like Daleks but the Cosy 6 just looks very, er, purple.
From what I've heard Octopus installs are gold plated - i.e. overspecced to ensure zero chance that the system won't perform - so they insist on replacing radiators which other installers wouldn't, temps people don't actually need and so on. Which seems to conflict with the whole ethos of the Cosy pumps but hey ho, they wouldn't consider me anyway until our place is finished which doesn't work!