UFH single zone and radiators with single thermostat and open Therm vs multi zone with

[Andree]

I'm in the process of designing heating for a new property. Downstairs there will be a radiator in the lounge, utility room, toilet and the garage. Upstairs there will be radiators in 4 rooms and 2 bathrooms. Bathrooms upstairs will also have dry ufh and toilet and utility room downstairs will have wet ufh.

What's your opinion on using single nest thermostat controlling the whole system to take advantage of the open therm on viessmann vitodens 50w and control radiators with TRVs.

Versus

Using open Nest to control ufh downstairs and one nest controlling radiators upstairs and lose open Therm.

My concerns are:
Unevenly heated house with single zone unless it's possible to balance the temperature with TRV adjustment.
Higher running cost on multi zone as open Therm won't work with multi zone on nest thermostat

What are everyone's thoughts?

I have attached the floor plans.

 

[SJB060685]

Whats the loads on each UFH circuit and radiators?
Whats the boiler output?
When using modulating controls and UFH this more often than not requires separation.

 

[Andree]

Whats the loads on each UFH circuit and radiators?
Whats the boiler output?
When using modulating controls and UFH this more often than not requires separation.

Hi SJB,


Please see attached the design for the ufh. What do you mean by loads?

35kW output

I always have the thermostat in the bedroom so we can control the heat more precisely during the night and only one room is ever occupied. Each rooms heating requirements has been precisely calculated and radiator size installed accordingly to achelieve a balance in the heating, to avoid inequality of the temperatures.

 

[SJB060685]

By loads I mean the requirements/outputs for the various UFH and radiator circuits in KW.
In both your comments you say you attached drawings but they don't appear to have uploaded?
Try again and we can have a look further. I will take a look when I can but not today. Merry Christmas by the way.

 

[Andree]

By loads I mean the requirements/outputs for the various UFH and radiator circuits in KW.
In both your comments you say you attached drawings but they don't appear to have uploaded?
Try again and we can have a look further. I will take a look when I can but not today. Merry Christmas by the way.

 

[Andree]

By loads I mean the requirements/outputs for the various UFH and radiator circuits in KW.
In both your comments you say you attached drawings but they don't appear to have uploaded?
Try again and we can have a look further. I will take a look when I can but not today. Merry Christmas by the way.

Files don't seem to be uploading. I've attached a link to them.

UFH – Google Drive

drive.google.com

I will send the output for each room later. Merry Christmas!