Ufh, with microbore rads

[gingalig]

Apologies if its already been covered. I've been asked to quote on a heat only with a solar compatible unvented, the existing system is 10mm microbore gravity fed to rads. I'm confident of the conversion and have my gas safe and G3, I've also been been asked to provide an outlet for, and install ufh. My concern is that the Ufh will act as a bypass. What preventative would I need. Excuse the ignorance but I don't usually work on Underfloor. Thank you.

 

[ShaunCorbs]

Two port valve and cct (close coupled tees) after the zone valve

 

[gingalig]

Two port valve and cct (close coupled tees) after the zone valve

Thankyou Shaun, as always a font of knowledge. I figured the valve, but do you think cct,s are preferable to a LLH.? This potentially shows my ignorance.

 

[ShaunCorbs]

There the same just some separation

Ufh sometimes only need a few kw this is where cct help with cycling etc

 

[gingalig]

There the same just some separation

Ufh sometimes only need a few kw this is where cct help with cycling etc

Thank you, looking at approx 3kw for the ufh, according to the builder.

 

[ShaunCorbs]

Thank you, looking at approx 3kw for the ufh, according to the builder.

Yea so under the boiler min kw

 

[SJB060685]

@ShaunCorbs. Sorry for my ignorance this time. What is the close coupled tees actually doing? Installations is not my thing obviously lol.

 

[ShaunCorbs]

@ShaunCorbs. Sorry for my ignorance this time. What is the close coupled tees actually doing? Installations is not my thing obviously lol.

In short it’s allowing the boiler circuit to flow independently of the ufh circuit

So when the ufh starts to get upto temp the mixing valve starts to close and pick up from the return so the flow is a trickle

With the cct before it still let’s the boiler circulate

 

[SJB060685]

Thanks Shaun. From what you said and what I've read I have a basic understanding of hydraulic separation but I'm not an installer and have not even seen this set up in person. All our work was just oil burners.