Underfloor heating Mitsibushi Ecodan System

Can you see what your flow temperature is ? There will possibly be two, one for each zone.

any guide as to how to set the settings the best for underfloor heating and radiators?  My zone has 2 zones.  Upstairs radiators downstairs underfloor heating.  Its a big property and I would like to try and save somewhat on the bills.  Not sure what the most efficient settings would be in order to get me the best results?

Morning ​@gdebruin,

I’m wondering whether ​@juliamc and ​@brichard may have any more helpful advice around this? I must say heat pumps aren’t my area of expertise. In the meantime I just wanted to link you to these previous Forum topics which you might find helpful:

​@Ben_OVO ​@gdebruin has another thread: 

which shows photos of their system, the main thing that M.isterW pointed out is the third party thermostat which will reduce efficiency. Best approach is to run the system using the Ecodan controller with weather compensation and not this thermostat control.

I have only had my heat pump since the end of November but I have spent a lot of time thinking about how to get the best out of it. My house is mainly 1930s construction, quiet large with 18 radiators mostly upgraded, solid brick in many parts with external insulation. Temperature set for 19c fully weather Comp.

My worst day was the 10th January where I used almost 60kwh. It was very cold and damp that day and I had no nighttime set back. My best day was February 21st where I you used 10kwh. COP YTD 4.2 which I am very happy with.

I don't think the electricity usage you are seeing is too bad and over a whole year should work out comparable or better with gas. I'm still playing with settings but currently set back to 16.5c from 10pm and ramping back to 19c at 5am. I'm also playing with water heat settings. Currently once per day at 1 pm. Water temp set temperature 45c. We have never run out of hot water despite the temperature showing only 12c on the tank thermostat. My plan is to keep turning the water down until I get complaints.

In general I'm spending more than when I had a gas boiler but with the boiler the house was cold most of the time now it's warm all of the time. To heat the house to this comfort lever with gas would be much more costly.

Hey ​@gdebruin 

brichard & juliamc have given some helpful responses here. Just tagging you so you don’t miss them 😊