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[oaky]

Is it better to locate the fill valve on the supply line or return line? I want to place it onto the 1 inch line where it enters the inside basement wall.

[LittleJohn]

Should not really matter; but I would personally locate it so that if it leaks or you need to drain boiler; it will not make an utter mess all over

[Sprinter]

Doesn't matter unless u have check valves even then u can still do it with some experience

[oaky]

Thanks, what about an inline sediment filter? Supply or return for the filter?

[LittleJohn]

Thanks, what about an inline sediment filter? Supply or return for the filter?

On my set up I would put the sediment filter on the OWB Supply (Hot) side; but that is only because I run thru a FPHX, then out to radiant slab, and FPHX are very unforgiving if you get them packed full of STUFF
  However if you are not running thru any kind of heat exchanger, I dont think it really matter where filter is put

[oaky]

Thanks Little John, since it doesn't matter, I'll place it on the supply line before the HX's.

[LittleJohn]

Thanks Little John, since it doesn't matter, I'll place it on the supply line before the HX's.

ALWAYS BEST IDEA  , to put a filter/strainer before you go into a HX, lessens chance of crud getting into HX and plugging it