Central heating loop

[AttilatheHen]

1) I have underfloor central heating which has proved inadequate.
2) I have decided to add 3 large radiators
3) The hot water flow from the boiler (in 22mm pipe) is approx 70 - 90 deg C. This is mixed with cooler water in a control unit before water is sent underfloor at approx 40 deg C. The return to the boiler is 15mm
4) Ideally I want to (a) take the flow to my loop of 3 rads from this 22mm pipe AND (b) take the return to this same pipe before it reaches the control unit. In this way I hope to extract the maximum amount of heat as the water passes around the complete circuit. My questions are:-
A) Will the water flow naturally around this loop given that start and finish are connected to the same source pipe?
B) Can I solve any problems by inserting 1 or 2 one way valves?
C) Or should I simply connect the return from the rad loop to the 15mm return to the boiler?

 

[glasgowgas]

A) Will the water flow naturally around this loop given that start and finish are connected to the same source pipe?
B) Can I solve any problems by inserting 1 or 2 one way valves?
C) Or should I simply connect the return from the rad loop to the 15mm return to the boiler?

A] should flow if you pipe connections properly and use trvs specifically for a one pipe system.
B]do you mean check valves? no won`t solve problems will cause `em
C]that would be your best bet, trvs will be a fraction of the price,and your boiler manufacturer will advise this as best practise

 

[bengasman]

Radiators are not on a loop; they are radials; fundamental difference.