I first joined the pool in March of 2015 playing around with CPU and GPU mining mostly for fun. I eventually got a pair of those 5 chip LTC+BTC dual miners (orb
to be continued....
stop experiments with power cables, remember that your miner run 24/7 and u not everytime at home.
Just pull 1-2 new 220V cable from the junction box.
If your boiler/water-heater has already 220V, then the junc.box is already prepared for 220V....
so just set two new MB16's for each 220V cable one MB16' device, then u have all safe and one cable as reserve for the l7 or l9's if buy those.
Use minimum 2mm² cables better 2,5mm², because they dont get hot easy. Dont use the same MB16/Mountpoint as your 220V Boiler/Heater
because it has probably enough KW/h if its an electric ones.
u can snooze the L3's with two additional 100mm or 150mm pipefan's and two DUCT's (3d printer) from 120mm to 100mm/150mm.
keep just an eye on the m³/h airblow!
https://www.ebay.de/itm/354876403200?_skw=rohrventilatoren&itmmeta=01JFNRJTP7EP3X9PFG178ST64J&hash=item52a0482e00:g:bDkAAOSwUbJkmp4L&itmprp=enc%3AAQAJAAAA0HoV3kP08IDx%2BKZ9MfhVJKnggZU2IPGO0gtaO8quzrRJWjJwKBKcfFzJKKBcfsJl3A%2B27DiAPdrfzDxFSW2rnxJwgIOCywPnB9uxJ2j43Tj%2BFCGCJ09deJUpEm%2FlF0RXdT4QpaN8qK5bMTNQ%2FjfcTXnBut9FuD9phYb6I7d4APddVz7vvF23l85VN%2B2P5gDMLQavjla6SS17%2B1IJKRLDgmHuW%2BAyP0xmjld0rDCY7%2Fupk3Aru4mfAJi2rsKNLH9JAAseBbU1d%2BKMC2QdYu3WCP8%3D%7Ctkp%3ABk9SR7Cry7j9ZA
https://www.ebay.de/itm/Kanal-Rohrventilator-Rohreinschub-Abluft-Lufter-Ventilator-Leise-100mm-150mm-/315971906787
this both are fine for L3's , just take one 100mm of the first link for BLOW-SIDE and one of the second link for the SUCTION-SIDE per one L3+/+ Miner. the cheaper one for the front/suction side both need 220V they are more than 50% quiet then the original FANs.
u can also use some little glass tanks or a building containing tanks for keeping fish and other water animals filled with Shell DIALA MINERAL OIL for immersion cooling a pump, two cooling devices for water cooling system and three 6" FANs per watercolling device to cooldown the oil, u need to dismount the FANs of the L3 or just cutting one cable per FAN then u dont need a extra cable wich fakes the FAN because the L3 dont has a immersion mode to bypass the fans for immersion cooling.
u can also use those pipefans for cooling the L7 and L9 but then in 150mm or maybe 200mm.
this pipefans are just 28/31 or 30/35 dB loud :-)
with blissz take 425MHZ and 13 (default) on Volting for significant Hashrate boost on the L3's (probably disable reboot on high asic failures, if ur mining on pps it does no matter.... just reboot the miner manualy every 24h because after 20-24hours the HW are uprising.
have fun