Connecting UFH to Combi Boiler

[matthew tubbs]

I am currently connecting my UFH system to my combi boiler (Worcester Bosch 42CDI).

I will T off from the existing radiator flow and put in a 2 port motorised zone valve on the rad flow, will I need a 2 port zone valve on the UFH circuit?

I cant ever see a situation when my UFH will not be switched on if my radiators are.

If I connected it like this would I still need an auto bypass valve?

 

[Agile]

What temperatures are you planning to run your UFH at?

Tony

 

[DP]

Y

I am currently connecting my UFH system to my combi boiler (Worcester Bosch 42CDI).

I will T off from the existing radiator flow and put in a 2 port motorised zone valve on the rad flow, will I need a 2 port zone valve on the UFH circuit?

I cant ever see a situation when my UFH will not be switched on if my radiators are.

If I connected it like this would I still need an auto bypass valve?

Yes, put the bypass in. If not needed, it can be set to max setting
You will need two two port valves. I have done it with a three port

 

[Steelmasons]

UFH circuit will require a longer heat up period (set back) as opposed to the heat emitters.

 

[Doggit]

Read this article.

 

[matthew tubbs]

Thanks all. I am hoping to run the floor about 40 degrees, but I guess only time will tell.

I did think about using a 3 port valve but the company who installed my UFH left me with a 2 port valve anyway so thought I might as well just by another and plumb it like s-plan.