Do you already have an s19 to use? If not get an urlacher. It is a pre modded s19 designed to be a quiet space heater with a known good design.
Discussion
Yes i already have one and its doing nothing ðŸ˜
You definitely hear mine running, but you hear an oil furnace running too. This way I get some of those sweet sats with my heat.
I got a 3d printed shroud and fan adapter card from njord (both from dcentral though the canada post strike might make that a bad source today) so I can use an 8" ac infinity fan. Urlacher mods only work on a very specific s19 sub model that I don't have.