Thanks in advance for any responses, have read a huge amount of threads here but there seems to be a lot of debate! We've very recently (last month) had a 6kw Riello NXHM ASHP installed. It heats a new extension on our house, while an oil boiler heats the old existing house. The extension is UFH downstairs and rads upstairs (these use a tado thermostat). I've been happy with how everything is working, currently have a heat curve set that is keeping the flow temp around 37ish with the current