UFH do I need direct connection to the boiler?

[ChrisKingston]

I've laid about 30sqm of normal 16mm underfloor heating pipe under a new concrete floor. One reel of 100m and another of about 70m. I have a new 30kW combi boiler.

I read you should have a direct connection to the boiler for the UFH manifold. I have 22mm flow and return pipes quite close to manifold, but that is after two Tee junctions of the 22mm main pipes (not fed any radiators though).

Can I get away with connecting it into the 22mm that is nearby, or do I have to take the floor up and get a branch to UFH before it has gone to any other rads or Tee junctions?

Or I guess it would definitely work at least a bit after branches, but how much better would it be if I made new 22mm flow and return pipes right from the boiler?

 

[Madrab]

Shouldn't be an issue - if the manifold you are using has a blending valve and a pump then there shouldn't really be a problem, you may have to do a bit of balancing to get the system heating up uniformly though and set the pump correctly.

 

[SpecialK]

Would you want the heating zoned? The UFH will need to come on well before radiators in the winter...