Filling Loop- position ?

[roger smith]

As I'm doing some mods to my sealed CH system I've considered moving the filling loop to a more convenient position. Especially as the Altenic magnetic cleaner kit just fitted came with new loop fittings. At present the loop is behind a heavy washing machine at floor level.
The instructions with the Loop fittings say it MUST be fitted to the boiler return, but for eminently practical reasons (a convenient accesible TEE at eye level) it would be esaiest to connect into the flow pipe. As the system is all at one pressure and often at the same temp- and is only in use for a few seconds per annum I'm asking what reasons are there for not connecting to the flow pipe ?

 

[roger smith]

Further Googling produced a view that it doesn't matter..https://www.plumbersforums.net/thre...ve-to-be-installed-to-the-return-pipe.105151/
other opinions still welcomed..I don't want to getthis wrong ...

 

[roger smith]

I did the change. It's now just above the floor standing boiler and into the Flow..I did notice a big change on doing a total refill and that is that the boiler and pump need much more initial air bleeding than the bottom fed position. But that might be nothing to do with which pipe it's into, but more to do with the higher position (it was at floor level before and striaght into the lower boiler connection) Just for info..