Using plastic pushfit on central heating loop

[scooby_snacks]

Hey guys,

I am looking to put in a new radiator in the downstairs hallway. I am intending to freeze the pipework to save myself draining the system and having to touch some of the older rad valves which i think my cause problems. I am going to tee off flow and return using speed fit connections and plastic pipe. The thing that concerns me though is putting pushfit and plastic in the central heating loop. Firstly will the plastic inserts inhibit the flow around the system, particularly if used on 15mm reducing the pipe diameters, or will this be negligible? Printed on the plastic pipe it states that the pipe should not be used on the last 1 metre before the boiler, does this imply that the plastic stuff, JG or otherwise is not suitable for high temperatures??

Cheers any comments appreciated

Plastic Amateur

 

[kevplumb]

you don't use inserts on copper with speedfit

the metre rule is only applicable to the boiler not the system it will be fine

 

[bengasman]

Inserts to not limit the flow around the system; there is no flow around the system, nor is there a loop. Out the boiler, in the flow pipe, in the rad, out the rad, in the return pipe, back into the boiler.

Inserts are only used in plastic pipe.
Different pipes have different specs: your product must be able to resist at least the maximum temperature of your boiler at 3 bar.

 

[scooby_snacks]

Cheers guys that has clarified a few things!!